wol n7c34 supplementary specifications section 73

BSS S73 73-1 of 73-92

BLDG13/S73.DOCX(1) Sal(140613) (DPG)

HOUSING & DEVELOPMENT BOARD

SECTION 73

73.0 SUPPLEMENTARY SPECIFICATIONS FOR:

PART A: BUILDING WORKS AT WOODLANDS NEIGHBOURHOOD 7 CONTRACT 34 (TOTAL : 194 DWELLING UNITS)

73.1 TESTING OF MATERIAL 73.1.1 Requirement

The Contractor shall carry out testing of materials for the Works to ensure compliance with the requirements stipulated under the Contract. Subject to sub-clauses 73.1.3, 73.1.4 and 73.1.6 specified hereunder, the Contractor shall only be required to bear the cost and expense for carrying out the testing of materials listed in the Schedule of Material Tests provided hereunder. As and when directed by the SO Rep, material testing shall be carried out at the Site or at SAC-SINGLAS laboratories or at HDB or at other laboratories as approved or at the place of manufacture or fabrication, all as specified for the respective materials. The Contractor shall ensure timely delivery of materials having regard to the programme for the Works submitted and the testing of materials to be carried out.

73.1.2 Tests At HDB

The following tests shall be conducted at the HDB. The Contractor shall be charged at the rates as specified below:

Type of Test Unit Rate ($)

Cube compression test Per cube 2.30

Cement sample test Per sample 311.00

Sand sample test Per sample 100.00

Coarse aggregates sample test Per sample 220.00

Windsor probe test Per test 100.00

Core test Per sample 103.00 Load test for horizontal member scaffold frame Per test 290.00

BSS S73 73-2 of 73-92


73.1 TESTING OF MATERIAL (CONT’D) 73.1.2 Tests At HDB (Cont'd)

Type of Test Unit Rate ($) Load test for vertical member scaffold frame: Per test 290.00

Tensile test for scaffold wall ties Per test 220.00

Compression test for scaffold wall ties Per test 220.00 Deflection and bending test for metal working platform Per test 400.00

Load test on metal working platform clamp Per test 350.00

Test for metal prop of frame Per test 80.00

Anchor Bolt Ultimate Tensile or Shear Test Per sample of 5 bolts 1,400.00

For the avoidance of doubt, in addition to paying the rates specified above, all other costs and expenses for such tests shall also be borne by the Contractor. The Contractor shall be charged for each sub-test when a re-test is required in the event that the test sample has failed the sub-test.

73.1.3 Further Testing Upon Failure

Any material test that fails shall be considered not to have fulfilled the requirements under the Schedule of Material Tests. In that event, the SO Rep may, without prejudice to his other rights under the Contract, order such further test as he deems necessary, all at the cost and expense of the Contractor. The Contractor shall bear the cost and expense for all failed tests.

73.1.4 Additional Tests

The SO Rep may also order additional material tests over and above those specified in the Schedule of Material Tests. The cost and expense for carrying out such additional material tests shall be borne by the Employer, provided that such tests pass the requirements stipulated under the Contract. The Contractor shall bear the cost and expense of any additional test that fails.

73.1.5 Test Not Ordered

In the event any test listed in the Schedule of Material Tests is not carried out, there shall be no cost recovery from the Contractor.

BSS S73 73-3 of 73-92


73.1 TESTING OF MATERIAL (CONT’D) 73.1.6 Submission Of Test Reports

The Contractor shall submit all test reports for to the SO Rep expeditiously. In the event that the Contractor fails to provide the requisite test reports to the SO Rep, the SO Rep shall be empowered to obtain the said test reports from the laboratories direct. In such event, all costs and expenses incurred shall be deducted from any monies due or becoming due to the Contractor or be recovered from the Contractor as a debt due by the Contractor to the Employer.

73.1.7 Functional And Other Tests The above provisions shall have application to the testing requirements specified in the Schedule of Material Tests only. Nothing therein shall in any way affect, vary or relieve the Contractor's obligation to carry out and bear all costs and expenses of other tests which are not material tests, required under the Contract, including but not limited to loading tests, concrete core tests, waterproofing tests, watertightness tests, water stagnation tests etc.

BSS S73 73-4 of 73-92


73.1 TESTING OF MATERIAL (CONT'D)

SCHEDULE OF MATERIAL TESTS (BUILDING WORKS)

S/N TYPE OF MATERIAL TO BE TESTED

TYPE OF TEST TO BE CARRIED OUT

FREQUENCY OF TEST FOR EACH TYPE

OF TEST

NO. OF SAMPLES PER TEST

1

Galvanised metal prop (for multi-storey car park/garage)

Stripping

1 test per source.

3 samples per test.

2

Scaffold frame

a) Load test on horizontal member b) Load test on vertical member c) Material test - tensile strength

a) 1 test. b) 1 test. c) 1 test.

a) 3 samples. b) 3 samples. c) 1 sample.

3

Scaffold wall ties

a) Tensile test b) Compression test

a) 1 test. b) 1 test.

a) 3 samples. b) 3 samples.

4

Metal working platform

a) Deflection & bending test b) Load test on clamp and hook

a) 1 test. b) 1 test.


5

Metal props of frames

Load test to SS 280

1 test per type.

1 sample per test.

6

Chemical used for pre-treatment of soil for protection of building against subterranean termites

Concentration of chemical used

a) Building block (excluding multi- storey carpark/ garage, link building and linkways) : i) 2 tests per

building block for ground slab;

ii) 2 tests per building block for apron.

) ) ) ) ) 1 sample ) per test. ) ) ) ) )

BSS S73 73-5 of 73-92







OF TEST


7

Non-HDB metalforms

a) Reduced section tensile

test b) Dimension test

a) 1 test b) 2 tests per building block for buildings up to 20 storeys; 3 tests per building block for buildings up to 30 storeys; 4 tests per building blocks for buildings up to 40 storeys.

a) 5 samples

per test. b) 17 samples per test

8

100 mm cube mould

Dimensional tolerance

1 test per source.

1 sample per test.

9

Concrete

a) Slump b) Compression

a) As and when directed. b) i) For sampling on Site: 1 test for every 40 m3 or part thereof, of each grade of concrete, subject to a minimum of 1 test for each batch; ii) For sampling at ready mix plant: 1 test for every 40 m3 or part thereof, subject to a minimum of 1 test for each batch.

a) 1 sample per test. b) 4 cubes per test (for 7-day & 28-day strength)

10

Steel reinforcement of diameter 10mm & above

a) Steel reinforcement bar: i) Tensile test ii) Bend test iii) Re-bend test

b) Welded steel fabric: i) Tensile test ii) Bend test

) 3 tests per source. ) )

) 3 pieces per ) size per test. )

BSS S73 73-6 of 73-92







OF TEST


11

(Reserved)

12

(Reserved)

13

Load bearing grout and load bearing mortar

Compression

3 tests per grade per casting day.

1 concrete cube per test.

14

Prestressing steel

Yield & Tensile

1 test per source.

3 samples per size per test.

15

For household shelters, the following shall be tested: (1) Blast door/frame i) Cathodic electro- deposition primer (where applicable) (2) Shelter enclosure

) a) Adhesion ) (ASTM D3359-02a); ) b) Scratch resistance ) (SS5: Part F2:03); ) c) Pencil hardness ) (ASTM 3363-00a); ) d) Dry film thickness ) (SS5:Part B1:03 ) Method No. 6); ) e) Resistance to ) continuous salt ) spray ) (SS5: Part G1:03); ) f) Resistance to ) humidity under ) condensation ) condition ) (SS5:Part G6:03). Air tightness test: At a water pressure level difference of 25 mm, the water pressure different shall not less than 5 mm after 45 seconds.

) ) ) ) ) ) ) ) ) ) 1 test per source ) ) ) ) ) ) ) ) ) ) ) ) ) 2 tests per 100 ) Dwelling Unit ) )

) ) ) ) ) ) ) ) ) ) 1 sample ) per test ) ) ) ) ) ) ) ) ) ) ) ) NA ) ) )

16

Sterilization of water tank

a) Bacteriological b) Chemical

) 1 test per tank. )

) 1 sample ) per test.

BSS S73 73-7 of 73-92







OF TEST


17

Precast lightweight concrete partition panel a) Anchor bolt or pin

a) Pull-out

a) 5 tests per building block.

a) 1 bolt per test.

18

Spiral connector

Tensile test

Quarterly

3 samples per size per test

19

Grout for spiral connector

Compression

1 test per casting day per building block

3 cubes per test

20

Ferrocement roof panel

a) Dimension; b) Cover; c) Density; d) Initial surface

absorption; e) Carbonation.

) ) ) 1 test per building ) block ) )

) ) ) 3 samples ) per test ) )

21

Showerhead (handset) and sliding bar

Nickel and chromium plating

2 tests per contract

1 piece per test

BSS S73 73-8 of 73-92







OF TEST


22

Main entrance timber doors

a) Stripping test to check compliance with dimensions and connection details b) Moisture content test to SS CP 1 (1982) c) Test of adhesive to AS 2754.1 : 1985


a) 1 sample. b) 1 sample. c) 1 sample.

23

Timber solid doors for bedrooms

a) Stripping test to check compliance with dimensions and connection details b) Moisture content test to SS CP 1 (1982) c) Test of adhesive to AS 2754.1 : 1985


a) 1 sample. b) 1 sample. c) 1 sample.

24

Weld (for steel structure)

Either one or a combination of : a) Radiographic b) Ultrasonic c) Penetration d) Magnetic particle

) ) ) 1 test per 10 joints. ) ) )

) ) ) 1 joint per ) test. ) )

25

Steel section and plates

a) Yield b) Tensile c) Notch toughness d) Ductility e) Weldability f) Material composition test

) ) ) 1 test per source. ) )

) ) ) 1 sample ) per test. )

26

Galvanised steel section

a) Stripping b) Zinc-mass coating

) ) 1 test per source. )

) 2 samples ) per test. )

27

Anchor bolt for sun-breaker

Pull-out

5 tests per building block.

1 bolt per test.

BSS S73 73-9 of 73-92







OF TEST


28

External clothes drying racks

Material composition test for poles

1 test.

1 sample.

29

Pre-packed waterproofing screed

a) Average Compressive

Strength b) Water penetration c) Shrinkage

) ) ) ) 1 test. ) )

) ) ) ) 1 sample. ) )

30

Pre-packed Floor screed

a) Average Compressive

Strength b) Shrinkage

) ) 1 test. ) )

) ) 1 sample. ) )

31

Pre-packed mortar mix

a) Tensile Pull out test b) Tensile Adhesion

strength tests c) Average Shrinkage

3 tests per building block. ) ) 1 test. ) )

5 spots per test. ) ) 1 sample. ) )

32

Pre-packed skimmed coat

a) Tensile Pull out test b) Tensile Adhesion

strength tests c) Average Shrinkage

3 tests per building block. ) ) 1 test. ) )

5 spots per test. ) ) 1 sample. ) )

BSS S73 73-10 of 73-92







OF TEST


33

Ceramic floor tiles(common areas and non residential units)

a) Length and width b) Thickness c) Surface flatness (for

non-structured floor tiles)

d) Surface quality e) Water absorption f) Breaking strength g) Modulus of Rupture h) Staining Test i) Resistance to

household chemicals j) Slip resistance k) Reverse staining Test

(for glazed tiles only)

) ) ) ) ) 1 test per brand. ) ) ) ) ) ) ) ) ) ) ) )

) ) ) ) ) 1 set ) per test. ) ) ) ) ) ) ) ) ) ) )

34

Ceramic floor tiles(bath/wc and wc)

a) Length and width b) Thickness c) Surface quality d) Water absorption e) Breaking strength f) Modulus of Rupture g) Staining Test h) Resistance to

household chemicals i) Slip resistance (wet &

dry)

) ) ) ) ) 1 test per colour. ) ) ) ) ) ) )

) ) ) ) ) 1 set ) per test. ) ) ) ) ) )

35

Glazed porcelain tiles (kitchen, service yard and household shelter)

a) Length and width b) Thickness c) Straightness of sides d) Rectangularity e) Flatness of surface f) Surface quality g) Water absorption h) Breaking strength i) Modulus of Rupture j) Staining Test k) Resistance to

household chemicals l) Slip resistance (wet &

dry)

) ) ) ) ) 1 test per colour. ) ) ) ) ) ) ) ) ) )

) ) ) ) ) 1 set ) per test. ) ) ) ) ) ) ) ) )

BSS S73 73-11 of 73-92







OF TEST


36

Glazed Porcelain floor tiles for living room, dining room and bedroom of residential units

a) Length and width b) Thickness c) Straightness of sides d) Rectangularity e) Surface flatness f) Surface quality g) Water absorption h) Breaking strength i) Modulus of Rupture j) Staining Test k) Resistance to

household chemicals l) Slip resistance

) ) ) ) ) 1 test per brand. ) ) ) ) ) ) ) ) ) )

) ) ) ) ) 1 set ) per test. ) ) ) ) ) ) ) ) )

37

Polished Porcelain floor tiles for living room, dining room, and bedroom of residential units

a) Length and width b) Thickness c) Straightness of sides d) Rectangularity e) Surface flatness f) Surface quality g) Water absorption h) Breaking strength i) Modulus of Rupture j) Staining Test k) Resistance to

household chemicals l) Slip resistance

) ) ) ) ) 1 test per brand.. ) ) ) ) ) ) ) ) ) ) ) )

) ) ) ) ) 1 set ) per test. ) ) ) ) ) ) ) ) ) ) )

BSS S73 73-12 of 73-92







OF TEST


38

Glazed ceramic wall tiles inside residential units

a) Length and width b) Thickness c) Surface flatness d) Surface quality e) Water absorption f) Breaking strength g) Modulus of rupture h) Staining Test i) Resistance to household chemicals j) Reverse staining test

) ) ) ) 1 test per colour ) ) ) ) ) ) ) ) ) ) ) ) ) )

) ) ) ) 1 set per ) test. ) ) ) ) ) ) ) ) ) ) ) ) )

39

Ceramic wall tiles(common areas and non residential units)

a) Length and width b) Thickness c) Surface flatness d) Surface quality e) Water absorption f) Breaking strength g) Modulus of rupture h) Staining Test i) Resistance to

household chemicals j) Colour fastness and light-fastness k) Reverse staining test

) ) ) ) 1 test per brand. ) ) ) ) ) ) ) ) ) ) ) ) ) )

) ) ) ) 1 set ) per test. ) ) ) ) ) ) ) ) ) ) ) ) )

40

Tile grout

a) Shrinkage b) Water absorption c) Compressive strength d) Flexural strength e) Abrasion Resistance

) ) ) 1 test per type. ) ) )

) ) ) 1 sample per ) test. ) )

BSS S73 73-13 of 73-92







OF TEST


41

Paint (internal)

Dilution

1 test per coat per building block.

1 sample per test.

42

Paint (external)

Dilution

1 test per coat per building block.

1 sample per test.

43

Solvent cement for jointing UPVC pipes and fittings

a) Shear strength b) Film properties c) Long term hydrostatic pressure.

) ) 1 test. ) )

) ) 1 sample. ) )

44

Ductile iron water pipes and ductile iron pipe fittings

Micro structure.

1 test.

1 sample.

45

Stainless steel water pipes

Material composition

1 test.

1 sample.

46

Sterilization of underground water distribution mains

a) Bacteriological b) Chemical

) 1 test per ) underground water ) distribution main.

) 1 sample ) per test. )

47

Galvanised steel gas pipes and fittings

Material composition

1 test.

1 sample.

48

Welding to API gas pipe joints

Radiographic test

100% of joints.

All.

49

Galvanised steel water pipes and fittings for fire fighting installation

a) Material composition b) Weight c) Dimension

) ) 1 test. )

) ) 1 sample. )

50

On site testing of concrete strength (in-situ or precast)

a) Core test b) Windsor Probe test

a) 1 test per building block on RC wall. b) 4 tests per building block on RC columns or walls and 1 test per building block on the RC wall where core test is conducted.

a) 1 sample per test. b) 3 samples per test.

BSS S73 73-14 of 73-92







OF TEST


51

Cement

a) Consistency; b) Soundness; c) Strength; d) Setting time

) ) 2 tests ) )

) 1 sample per ) test ) )

52

Coarse Aggregates

a) Sieve analysis b) Particle density and water absorption c) Bulk density d) Flakiness index e) Shape index

) ) ) 2 tests ) ) )

) ) ) 1 sample per ) test ) )

53

Sand

a) Sieve analysis b) Decantation c) Particle density and water absorption d) Bulk density

) ) ) 2 tests ) )

) ) 1 sample per ) test ) )

54

Laminated safety glass for fixed panel below cill height

SS 341 : 2001 a) Impact test b) Boil test c) Overall bow & warp

(flatness) test d) Dimensional, thickness

and squareness test

) ) ) 1 test ) ) ) )

a) 4 samples b) 3 samples c) 1 sample d) 1 sample

55

Cast-in-Situ EPDM Rubber Flooring for Children Playground

a) Impact Attenuation b) Ease of Ignition

a) 1 test per playground b) 1 test per playground


56

Glazing glass

a) Chemical Composition to BS 952 b) Dimensional to BS 952 (i) Height (ii) Width (iii) Straightness

) ) ) 1 test ) ) )

) ) 1 sample per ) test ) ) )

57

Timber Strip Floor

a) Identification of timber

species b) Adhesion bond

strength of adhesive test standard adopted from ASTM 4541 : 1993

c) Abrasion Resistance of

varnish test standard adopted from SS 5 : Part F5 : 2003 on timber substrate

a) 1 test b) 1 test c) 1 test

a) 1 sample (1

timber strip) b) 3 samples (6

timber strips per sample with adhesive)

c) 2 samples

with varnish (435mm x 165mm x 10mm each)

BSS S73 73-15 of 73-92







OF TEST


58

Tile adhesive for floor and wall tiles

a) Tensile Adhesion Bond

Strength b) Tensile Adhesion Bond

Strength (After Water Immersion)

c) Tensile Adhesion Bond

Strength (After Heat Aging)

d) Open Time e) Deformity

) ) ) ) ) ) ) ) ) 1 test per brand per ) contract ) ) ) ) ) ) ) )

) ) ) ) ) ) ) ) ) 1 sample per ) test ) ) ) ) ) ) ) )

59

Wall tiling work (Within flats)

Tensile pull-out test

3 tests per building block

5 samples per test

60

Wall tiling work (Common Areas)

Tensile pull-out test 1 test per building block 5 samples per test

61

Floor tiling work (Within Flats)

Tensile pull-out test 3 tests per building block 5 samples per test

62

Floor tiling work (Common Areas)

Tensile pull-out test 1 test per building block 5 samples per test

63

Anchor bolts (Chemical anchor-Type A or B)

Ultimate Tensile & Shear Test

1 tensile test and 1 shear test per contract

5 samples per test

64

Anchor Bolt (Heavy duty Mechanical)

Ultimate Tensile & Shear Test

1 tensile test and 1 shear test per contract

5 samples per test

65

Concrete (for bored piles only)

a) Slump b) Compression

a) As and when directed b) 1 test per 10 m

3 or part thereof.

a) 1 sample per

test b) 4 cubes per

test (for 7-day & 28-day strength)

66 Grout mix for micropiles

Compression

1 test for every 3 m

3 of

grout

4 cubes per test (7-day & 28-day strength)

BSS S73 73-16 of 73-92







OF TEST


67

Bolts (Used in the construction of steel lift shafts)

a) Tensile b) Hardness c) Chemical Analysis

2 tests per source per Contract

3 pieces per size per test

68

Nuts (Used in the construction of steel lift shafts)

a) Hardness b) Proof Load Test



69

Washers (Used in the construction of steel lift shafts)

a) Hardness



70

Basin Mixer and shower mixer

a) Coating thickness b) Mechanical Endurance

2 tests per contract

1 piece per test

71

Glazed porcelain wall tiles (accent tile) inside residential units

a) Length and width b) Thickness c) Surface flatness d) Surface quality e) Water absorption f) Breaking strength g) Modulus of rupture h) Staining Test i) Resistance to household chemicals

) ) ) ) 1 test per colour ) ) ) ) ) ) )

) ) ) ) 1 set per ) test. ) ) ) ) ) )

BSS S73 73-17 of 73-92



SCHEDULE OF MATERIAL TESTS (CE WORKS)

S/N TYPE OF

MATERIAL TO BE TESTED


FREQUENCY OF TEST FOR EACH TYPE OF TEST


72

Timber piles

) a) Moisture content ) ) b) Green/dry stresses ) (stress grading) ) ) c) Preservative ) penetration ) ) d) Dry salt retention

) ) 1) 1 test for up to 3000 metre ) run. ) ) 2) Subsequent test at each ) interval of 3000 metre run ) subject to a minimum of ) 2 test. )

73

Concrete - concrete cube

Compressive strength

1 test for every 20 cubic metre or part thereof of each grade for every concreting day.

2 cubes for test at 7 days and 2 cubes for test at 28 days.

74

Precast concrete drain channels, kerbs, road channels (gutters), dividers, etc

Absorption test

0.5% of total quantities required for the Works subject to a minimum of 3 numbers.

3

75

Precast aeration slabs

a) Water absorption test

a) 0.5% of total quantities

required for the Works subject to a minimum of 3 slabs.

} } } } 3 } } }

b) Transverse strength test

b) Minimum of 3 slabs for

every 1,000 pieces of the Works.

76

Precast BG slabs

a) Water absorption

a) 3 tests for every 1,000

pieces subject to a minimum of 3 tests.

} } } 3 } } }

b) Transverse strength test

b) 3 tests for every 1,000

pieces subject to a minimum of 3 tests.

77

Interlocking concrete paving blocks

a) Compressive strength

a) 1 test for each 550 m2 of

interlocking concrete pavement.

16

b) Surface Layer Thickness

b) 5 tests, comprising 1 sample

per test, for each 550 m2 of interlocking concrete pavement.

1

BSS S73 73-18 of 73-92



SCHEDULE OF MATERIAL TESTS (CE WORKS)

S/N TYPE OF

MATERIAL TO BE TESTED


FREQUENCY OF TEST FOR EACH TYPE OF TEST


78

Clay pavers for flexible pavement (Type PB)

a) Mean Transverse Breaking Load Test

a) 1 test for each 200 m2 of

clay pavers pavement.

10

b) Mean Wet Skid Resistance

b) 1 test for each 200 m2 of

clay pavers pavement.

5

79

Hot dipped galvanised grating

Zinc Mass Coating Test

2% of total number of gratings subject to a minimum of 3 numbers of gratings.

80

Soil testing for sidetables.

Soil classification

1 test for every 200 m of sidetable subject to a minimum of 2 tests.

81

Final testing of kerbs.

Water absorption test

1 test for every 120 m length subject to a minimum of 2 tests.

82

Final testing of premix.

Grading analysis, thickness and bitumen content

1 test for every 550 m2 of carpark and 1 test for every 450 m2 of service road/driveway subject to a minimum of 2 tests.

83

Final testing of precast footpath slabs.

Water absorption test

1 sample for every 350 m2 subject to a minimum of 2 tests.

84

Compaction of road formation.

a) Compaction test (Dry Density/Moisture Content Relation)

a) 1 test for each class

of material to be compacted

b) In Situ Field Density Test

b) 1 test for every 300m2 of

surface of each compacted layer.

85

Compaction of subgrade.

CBR test.

1 test for every 50m of carriagew ay subject to a minimum of 3 tests.

86

Plant soil.

Soil classifications.

3 tests.

87

Road Works

LTA Road Testing Requirements

As specified in the Specifications.

88

Perforated Interlocking Paring Slabs

a) Tranverse Strength

Test

a) Minimum of 3 slabs for

every 1,000 pieces.

b) Water Absorption Test

b) Minimum of 5 slabls for

every 1,000 pieces.

c) Surface Layer

thickness

b) 5 tests comprising 1 sample

per test, for each 550 m2 of interlocking concrete pavement.

BSS S73 73-19 of 73-92


73.2 PROVISION OF WARRANTY The Contractor and his Specialist (if applicable) shall be required to

provide warranties for certain specified works and/or materials under the Contract. For the avoidance of doubt, the Contractor and his Specialist (if applicable) shall only be required to provide the following warranties:

Clause and/or

Subclause No.

Works/Materials To Be Warranted Format

3.16

Pre-Treatment Of Soil For Protection Of Buildings Against Subterranean Termites

Appendix A1 and/or Appendix A1(TC)

14.3

Complete System Of Waterproofing Treatment And Panel Roofing


23.2 External Painting Works Appendix A5 and/or

Appendix A5(TC)

25.10 Cast-In-Situ EPDM Rubber Flooring For Children's Playground


74.10 Complete Waterproofing Membrane System for Carpark Roof Decks & Other Specified Areas

Appendix B8 and/or Appendix B8(TC)

74.11 Fluorocarbon-coated Aluminium Composite Roofing Panels For Linkways

Appendix B1 and/or Appendix B1(TC)

74.43 Children Playground Appendix B5 and/or Appendix B5(TC)

74.44 Adult Fitness Equipment Appendix B6 and/or Appendix B6(TC)

74.45 Elderly Fitness Stations Appendix B7 and/or Appendix B7(TC)

BSS S73 73-20 of 73-92


73.3a OPTIONAL COMPONENT SCHEME FOR PROVISION OF INTERNAL DOORS AND FLOOR FINISHES TO LIVING ROOMS, BEDROOMS AND BATHROOMS

(a) Scope of Works Under Optional Component Scheme

The Contractor shall provide the under mentioned fittings and finishes

and fill in the rates of the works in the Form of Tender based on the stipulated provisional quantities:

Types of Works Internal Doors to bedroom/bathroom 1. Timber doors to bedroom and bathroom/toilet including approved

ironmongeries, accessories and painting as specified.

Floor finishes including skirting 2. Floor finishes including skirting to the living rooms and bedrooms, all

as specified.

Notwithstanding the above provision, the Contractor shall be required

to provide door frames complete with the requisite hinges as specified for all residential units as specified and/or as shown.

(b) Sum and/or Rates Offered by the Contractor in the Breakdown of

Total Lump Sum of Form of Tender Breakdown of the Form of Tender shall be the full and inclusive cost

and expenses of the use of materials, labour, equipment, tools and vehicles including maintenance, supply of fuel and all idle time, conveyance, delivery, unloading, storing, hoisting, all labour setting, fitting, scaffolding and fixing in position, all cutting and waste, return of packings, establishment charges, overheads and profit.

All rates offered by the Contractor shall be exclusive of any Goods

and Services Tax. Any such Goods and Services Tax shall be borne by the HDB as and when the same becomes due and payable.

BSS S73 73-21 of 73-92


73.3a OPTIONAL COMPONENT SCHEME FOR PROVISION OF INTERNAL DOORS, AND FLOOR FINISHES TO LIVING ROOMS, BEDROOMS AND BATHROOMS (CONT'D) (c) Adjustment to Contract Sum Upon Completion

Upon completion, the actual work done by the Contractor shall be

determined by the SO Rep. The Lump Sum for the respective works as offered by the Contractor in the Form of Tender shall then be adjusted based on the value of the actual work carried out by the Contractor. The adjustment (addition or omission) shall be the net difference between the Lump Sum as in Form of Tender and the value of actual work carried out by the Contractor.

The adjustment shall be effected by way of a variation under the Contract. The value of actual work carried out by the Contractor shall be the product of the actual quantity supplied and installed and the Basic Rate. The Basic Rate for the respective work items (i.e. no. of internal doors at the bedroom/bathroom, and no. of dwelling units which opt for floor finishes including skirting to the living rooms and bedrooms) shall be derived as follows:

Basic Rate = Lump Sum for the Respective Works in the Form of Tender

Provisional Quantity for the Respective Works in the Form of Tender 73.3b Reserved

BSS S73 73-22 of 73-92


73.4a POLISHED PORCELAIN FLOOR TILES FOR LIVING ROOMS, BEDROOMS AND DINING ROOMS

This clause shall supersede sub-clause 19.6 “Polished Porcelain Floor

Tiles For Living Rooms, Bedrooms, Household Shelter With Door Facing Living Room And Dining Room” of the Standard Specifications For Building Works and Other Installations.

73.4.1a General

(a) Location For Laying Porcelain Tiles

Provide and lay rectified polished porcelain floor tiles to living rooms, bedrooms, dining room and to any other locations shown in the Drawings.

The Contractor shall produce test reports from accredited testing

laboratory to show compliance with the specified requirements. The test reports shall be submitted to SO’s rep before commencement of the sample unit.

(b) Sorting of Floor Tiles In the event that the polished porcelain floor tiles delivered to the

Site are inconsistent in sizes but fall within the allowable tolerances as specified in this Clause including all sub clauses under it, the tiles shall be sorted out into separate groups of compatible sizes to the satisfaction of the SO Rep. Tiles of one size group shall be laid in one area separate from tiles belonging to other size groups.

73.4.2a Approved Polished Porcelain Floor Tiles The type of polished porcelain floor tiles provided by the Contractor as

specified in this clause including all sub clauses under it shall be subject to the approval of the SO Rep. Notwithstanding any approval by the SO Rep, the Contractor shall ensure that all such porcelain floor tiles for such locations as specified comply with the requirements as specified in this clause including all sub clauses under it.

BSS S73 73-23 of 73-92


73.4a POLISHED PORCELAIN FLOOR TILES FOR LIVING ROOMS,

BEDROOMS AND DINING ROOMS (CONT’D) 73.4.3a Testing Requirements (a) Test Samples And Methods All test samples shall be randomly chosen from the same batch of

delivery by the SO Rep. The test methods shall be in accordance with the latest ISO 13006 (Annex G) unless otherwise specified.

(b) Test Certificates And Compliance Requirements Provide test certificates by a testing laboratory accredited under

SINGLAS to cover the tests mentioned in this clause including all sub-clauses under it and all other tests specified in the "Schedule Of Material Tests".

73.4.4a Technical Specifications The polished porcelain tile shall be rectified with the edges trimmed to

achieve precise dimension for its length and width. The polished porcelain tiles shall not be made of red clay. Dimensional and surface quality requirements and physical and chemical properties shall be in accordance with the latest ISO 13006 (Annex G) unless other specified:

(a) Dimensions The dimensions shall be as follows : Nominal Length : 600 mm Nominal Width : 600 mm Nominal Thickness : 10 mm

BSS S73 73-24 of 73-92


73.4a POLISHED PORCELAIN FLOOR TILES FOR LIVING ROOMS, BEDROOMS AND DINING ROOMS (CONT’D)

73.4.4a Technical Specifications (Cont’d)

(a) Dimensions

The dimensional tolerances shall be as follows :

(i) Length

: Average length of each tile shall not deviate by more than ±0.6mm from the average length of 10 test specimens.

(ii) Width : Average width of each tile shall not deviate by more than ±0.6mm from the average width of 10 test specimens.

(iii) Thickness : Average thickness of each tile shall not deviate by more than ±0.5mm from the average thickness of 10 test specimens Average thickness of 10 test specimens shall not be less than 9.5mm.

(iv) Straightness of Sides

: Maximum deviation of each tile shall not exceed ±0.6mm of the work size and chamfer edge of 0.5mm.

(v) Rectangularity : Maximum deviation of each tile shall not exceed ±0.6mm of the work size.

(vi) Flatness of Surface

: Maximum centre curvature of each tile shall not exceed ±0.8mm of the work size. Maximum edge curvature of each tile shall not exceed ±0.8mm of the work size. Maximum warpage of each tile shall not exceed ±0.8mm of the work size.

(b) Surface Quality The tiles shall be free from objectionable surface blemishes such as

projections, depressions, flakes, hairline cracks and bubbles. The tiles shall be level and regular in size with properly formed corners and shall not be warped or deformed in any manner.

BSS S73 73-25 of 73-92


73.4a POLISHED PORCELAIN FLOOR TILES FOR LIVING ROOMS, BEDROOMS AND DINING ROOMS (CONT’D)

73.4.4a Technical Specifications (Cont'd) (c) Physical properties

(i) Water Absorption

: Shall be a maximum of 0.1%

(ii) Modulus Of Rupture

: Minimum average strength shall not be less than 35 N per mm2.

(iii) Breaking Strength

: Not less than 1300 N

(iv) Colour Tone : The colour tone of the tiles shall be consistent. The SO Rep reserves the right to reject tiles that show colour tone variation including such tiles that have already been laid.

(d) Chemical properties

(i) Staining Test : The staining test method shall be in accordance with the latest ISO 10545-14 The stain resistance shall be of Class 5 minimum

(ii) Resistance to Household Chemicals

: Minimum GB

(iii) Slip Resistance

:

The Slip Resistance Test method shall be in accordance with the latest SS 485. The test shall be conducted under dry condition using dry floor friction test with a coefficient of friction of minimum 0.4.

BSS S73 73-26 of 73-92


73.4a POLISHED PORCELAIN FLOOR TILES FOR LIVING ROOMS,

BEDROOMS AND DINING ROOMS (CONT’D) 73.4.5a Laying Of Floor Tiles The laying of floor tiles shall be in accordance with clause 19.7 “Laying of

Ceramic Floor Tiles” including all sub-clauses under it. 73.4.6a Timber Skirting Supply and lay 1200mm long x 75mm x 12mm thick timber skirting to

living, dining areas and to any other locations where polished porcelain floor tiles are laid. The timber skirting shall be “Teak” or “Nyatoh” or other approved hardwood. A sample of the timber skirting shall be submitted for the SO Rep approval. Skirting shall be sanded smooth and varnished with 2 coats before being delivered to the Site for installation. Nail holes shall be properly patched up prior to the application of final varnishing coat. Timber skirting need not be provided for floor finishes to internal of household shelters.

73.4b Reserved 73.5 SUPPLY OF PRECAST COMPONENTS BY HDB 73.5.1 Reserved 73.5.2 Precast Components To Be Supplied By HDB or Source On Their Own

From HDB’s Materials List Contractor may opt to obtain the following precast components, including

integrated components consisting entirely of the items below from HDB at the prescribed rates:

Item Precast Components Rates of Supply

1 75mm thick FerroLite partition wall system $41.40 / m2

Alternatively Contractor may source on their own from suppliers in HDB’s Materials List. For FerroLite partition walls, Contractor may also propose alternative system subject to the approval of the SO Rep.

BSS S73 73-27 of 73-92


73.5 SUPPLY OF PRECAST COMPONENTS BY HDB (CONT’D) 73.5.3 Sourcing of Precast Components If the Contractor opts to obtain any of the precast components listed in

clause “Precast Components To Be Supplied By HDB or Source on their own from HDB’s Materials List” directly from suppliers in HDB’s Materials List instead of HDB, he shall indicate clearly in Annex E of the Form of Tender which is to be submitted during tender closing.

Where a component type indicated by the Contractor to be obtained from

HDB is integrated with other component types indicated by the Contractor to be sourced directly from HDB’s Materials List, such integrated components shall also be obtained from HDB at the prescribed rates indicated in the clause “Precast Components To Be Supplied By HDB or Source on their own from HDB’s Materials List” and shall be based on each individual component type and computed separately.

In the event that no indication is made for any of the precast components

or the Contractor has indicated in both columns “Obtain from HDB at prescribed rates” and “Source directly from suppliers in HDB’s Material List” for any components in Annex E of the Form of Tender that is submitted during tender closing, the Contractor shall deem to obtain the supply of these precast components from HDB at the supply rates stipulated in clause “Precast Components To Be Supplied By HDB or Source on their own from HDB’s Materials List”

73.5.3.1 Reserved 73.5.3.2 Reserved 73.5.4 Reserved 73.5.5 Reserved 73.5.6 Reserved 73.5.7 Payment Of Precast Components 73.5.7.1 Based on rates of supply in Clause “Supply Of Precast Components By

HDB” above, the Contractor shall pay 80% of the total value for precast components stored in HDB or its designated storage yard based on the quantities given in the stock list from HDB. The remaining 20% shall be paid when the precast components are delivered to site.

73.5.7.2 The rates listed in Clause “Supply Of Precast Components By HDB” are

without GST. GST shall be added to the rates. Payment shall be made by deduction from the contractor's monthly progress payment.

BSS S73 73-28 of 73-92


73.5 SUPPLY OF PRECAST COMPONENTS BY HDB (CONT’D) 73.5.7.3 Credit Facility The clause on "Credit Terms And Conditions For Employer's Materials" in

the Standard Specifications shall be applicable to all precast components supplied by the employer. The contractor shall be given a 2-month credit facility with terms and conditions as accordance to that clause.

73.5.8 Method Of Measurement

Unless otherwise stated, the area of precast components shall be based on projected area from the elevation view of the precast component. For C, L or T-shape or angular precast components, which have more than one projected area in different directions, the measurement shall be the sum of these projected area created by combination of overlapping flat parts. For precast components with protruding features such as nibs, canopies, fins, bay windows, balcony and copings, etc., extending more than 150mm from the face of the components, additional areas shall be measured based on the plan or vertical area of such features from the face of the components. The area of the [recast components in square metres shall be measured nett, which is defined as gross area less each opening, except window openings, larger than 0.5 square metre. To be considered as window openings, where no deduction to the area shall be made, the following conditions must be met: (i) The opening is intended for installation of window by the Contractor;

and (ii) The opening is bounded by at least 3 sides. For the purpose of calculation of projected area, the full height of the precast component including the kerbs shall be used. Deduction of projected area due to partial kerb shall be made only if the kerb length is less than 1.0m. The rate of supply for precast wall is inclusive of the cast-in reinforcement. All other reinforcement that are to be placed on site or for connection at joints are not included and to be supplied by the Contractor. In the event that a different thickness other than those specified in the clause “Precast Components To Be Supplied By HDB” and “Precast Components To Be Supplied By HDB or Source on their own from HDB’s Materials List”, are required, the price of the precast component shall be determined by linear interpolation/ extrapolation from the median thickness (if applicable) specified in the above clauses. For integrated components, measurement of each individual component type shall be computed separately.

BSS S73 73-29 of 73-92


73.5 SUPPLY OF PRECAST COMPONENTS BY HDB (CONT’D)

73.5.8 Method Of Measurement (Cont’d) 73.5.8.1 Reserved 73.5.8.2 Reserved 73.5.8.3 Reserved 73.5.8.4 Reserved 73.5.8.5 Reserved 73.5.8.6 Reserved 73.5.8.7 Reserved 73.5.8.8 Confirmation of Quantities Upon final billing of precast components supplied by HDB, the Contractor

shall check and confirm the final quantities within three (3) months. 73.5.9 Reserved 73.5.10 Reserved

BSS S73 73-30 of 73-92


73.5 SUPPLY OF PRECAST COMPONENTS BY HDB (CONT’D) 73.5.11 Co-ordination With HDB

73.5.11.1 The contractor shall submit the followings to HDB for approval not later

than 4 weeks after the date of the Letter of Acceptance of the contract:

(a) Initial precast component demand schedule according to the building blocks, the storey and the quantities for each type of precast component. For initial production planning purposes, the preliminary schedule is acceptable to HDB. However, the Contractor shall submit the revised schedule once the master construction schedule has been finalized;

(b) Site installation plan showing the accesses and trailer parking

positions for each block; (c) Storage plan for storage of precast components; (d) Position of bracing points on the precast components, if not indicated

in the drawings. The contractor may also propose alternative position for the bracing points. In general, the drawings will indicate 4 inserts to be provided for each precast component. Any additional insert will have to be supplied by the contractor at his own cost; and

(e) The contractor shall also submit its planned site activities schedule

for each construction cycle, which would show the timing for the requirement of each type of precast components.

73.5.11.2 Precast Components Requirement Schedule

(a) The Contractor shall submit monthly precast component requirement according to the progress of the building construction. The Contractor shall update the Monthly requirement diligently and submit by 27th of each month. In addition, the contractor shall also submit the next level slab casting schedule to HDB on every Friday of the week.

BSS S73 73-31 of 73-92



73.5.11 Co-ordination With HDB (Cont’d) 73.5.11.2 Precast Components Requirement Schedule (Cont’d)

(b) Weekly Order of Precast Components

The Contractor shall email the order form to HDB at least 3 days in advance to confirm the actual requirement of precast components. When the delivery schedule has to be amended, HDB will inform Contractor 2 days in advance of the required changes.

Such monthly precast component requirement and weekly order of precast components shall be realistic to ensure the Contractor is able to proceed with the works on schedule without imposing excessive requirements on the delivery.

(c) Cancellation of Delivery Order or Changes to Delivery Dates of

Precast Components

The Contractor shall inform HDB and HDB’s appointed Precast Term Contractors at least 24 hours before the scheduled delivery for any cancellation of delivery order or any change to delivery dates for precast components. Otherwise, the delivery order is deemed to have been confirmed.

73.5.11.3 Where there is a need for Contractor to supply cast-in items, HDB will

provide the materials delivery schedule to the Contractor. The Contractor shall check and ensure the accuracy of all the quantity and types of cast-in items before delivery. Contractor shall provide feedback to HDB if any adjustment to the ordering schedule is required. Otherwise, the ordering schedule is deemed to have been confirmed and all the cast-in items shall be delivered to HDB or its appointed precast term contractor plant accordingly. The Contractor shall be liable for all costs of delay arising from the late delivery of the cast-in items. All cost of materials, labour etc necessary for the supply and delivery of all items to be supplied by the Contractor are deemed to be included in the tender sum.

When it is deemed necessary to accelerate the production work and keep

stock of the precast components as its contingency production plan, HDB reserve the right to advance the materials ordering schedule ahead of the actual site progress. In such case, the Contractor is allowed to claim for materials offsite as per clause “Progress Payment Claim For Material Off-Site”.

BSS S73 73-32 of 73-92


73.5 SUPPLY OF PRECAST COMPONENTS BY HDB (CONT’D) 73.5.12 Delivery Of Components

The Contractor shall submit the site schedule to HDB and allow a minimum of 10 weeks, upon approval of workshop drawings, for the delivery of the first precast component. The precast components shall be delivered by trailers or trucks to the site. The trailer shall be parked at the designated parking lot as given by the Contractor. If the trailers or trucks have to be parked outside the building site, the Contractor shall be responsible for any damage to the precast components delivered to the Contractor. The Contractor shall ensure the site is fully accessible at all times for trailers to deliver precast components and hard standing access shall be provided. Where necessary, components delivery to site per trailer shall not be restricted to within a block or for immediate use, such as to maximise per trip delivery. The Contractor is required to do internal transfer of precast components to various blocks within the site and unload all precast components into the storage area which do not have immediate use The Contractor shall provide washing facilities at the site to ensure that vehicles leaving the site do not dirty the public roads. Any charges for road littering as a result of the Contractor's failure to do so shall be borne by the Contractor. The Contractor shall ensure that the prime mover or the trucks are not held up at the site for more than 2 hours and the trailer is unloaded within 24 hours. In the event that the precast components are produced and delivered from overseas: (a) The Contractor shall ensure that all such precast components on trailers or trucks are unloaded within the same day if deliveries arrive at the site before 3:00 pm. If deliveries arrive at the site after 3:00 pm, the Contractor shall ensure that all precast component are unloaded by 12:00 noon on the following day. (b) The Contractor shall verify the times of deliveries arrive at the site and upon completion of the unloading, sign and endorse on delivery order. If the Contractor fails to carry out his obligation as aforesaid, the SO Rep may exercise his right under Clause 1.6 "Nuisance and Irregularities' to impose a charge against the contractor.

BSS S73 73-33 of 73-92


73.5 SUPPLY OF PRECAST COMPONENTS BY HDB (CONT’D) 73.5.13 Storage Of Precast Components 73.5.13.1 The Contractor shall designate and allocate storage space of at least 100

square metres per block. The designated storage space shall be on hard standing ground. The Contractor shall provide storage racks for the storage of precast components delivered to site. This storage area shall be indicated and submitted together with the site office location plan. The Contractor is deemed to have included in the tender sum the cost of storage racks, ground improvement etc necessary for safe and orderly storage of precast component on site.

73.5.13.2 The Contractor shall ensure that there are sufficient precast components

stored on site to ensure smooth construction progress. The contractor will have to bear all cost arising out of construction delays due to insufficient precast components storage on site.

73.5.14 Quality Of Precast Components

The Contractor shall check the precast components for any major defects before unloading the precast components from the trailer. Defects feedback must be made to HDB within 7 days from the time the components reaching the worksite or before installation of the precast components, whichever earlier. Thereafter, the Contractor shall be responsible for any necessary rectifications at his own cost and time. Contractor shall install components with alignment taken on the external. Components with serious dimension error that cause external misalignment shall not be installed and must feedback to HDB immediately. The Contractor shall address precast quality issues early in the project for components obtained from HDB’s appointed precast term contractors, to establish a reasonable and achievable level of quality. If some of the precast components at early stage have defects or quality issues, the Contractor can highlight at delivery and get the term contractors to repair later on site. If the defects or quality issues are a wide ranging and consistent problem, the Contractor shall resolve the problem with the term contractors. The Contractor shall not take the “receive-and-install” approach without assessing the quality of the precast components and expect the term contractors to do wide ranging repair at a later stage. This is to avoid duplication of works and the delay of building hand-over. The Contractor is required to apply skim coating or other approved method to the precast components, subsequently for painting purposes.

BSS S73 73-34 of 73-92


73.5 SUPPLY OF PRECAST COMPONENTS BY HDB (CONT’D) 73.5.15 Provision Of Drawings

Where concealment of electrical services is required, the Contractor shall submit electrical services workshop drawings for each type of dwelling units to HDB. The drawings shall include details such as position of the services and typical dimensions of the openings or recesses required to be formed on the precast components. While the contractor is required to keep his privately sourced precasters informed of all amendments issued by HDB, the Contractor is also required to keep precasters supplying through the HDB informed of all such amendments. The Contractor can send such amendments to HDB where they will be coordinated and disseminated for the Contractor. These amendments are architectural, M&E, C&S drawings or any other drawings that will affect the production of precast components. Such provision should be done in a timely manner to avoid abortive precast works and construction delays.

73.5.16 Checking Of Precast Workshop Drawings

The Contractor is required to check the workshop drawings, in conjunction with all other drawings such as structural, architectural and/or mechanical and electrical drawings and provide feedback to HDB on any discrepancy before commencement of production work. When discrepancy is encountered, the Contractor shall facilitate and assist to liaise with all the Technical Professionals or his subcontractors to resolve the discrepancy. Following that, the Contractor shall provide HDB the amended structural, mechanical, electrical, architectural details and any other relevant details necessary to effect the changes. The Contractor shall also check the accuracy of the position and routing of the services or cast-in accessories and provide feedback to HDB for incorporation into the drawings. Recesses shall be provided in the precast components, for site installation of electrical socket boxes by the Contractor.

73.5.17 Reserved

BSS S73 73-35 of 73-92


73.5 SUPPLY OF PRECAST COMPONENTS BY HDB (CONT’D) 73.5.18 Progress Payment Claim For Material Off-Site The Contractor shall be allowed to claim for material off-site at HDB or its

designated storage yard. The quantity of precast components, which the Contractor is allowed to claim, shall be based on the quantities given in the stock list from HDB, which is provided in the monthly invoices for supply of precast components: “BILLING TO CONTRACTOR FOR PRECAST COMPONENTS DELIVERED TO SITE”.

The Contractor shall make use of the billing from the preceding month to claim for material off-site in the current month.

To illustrate: For Material Off-Site at HDB claim for progress payment for month ending 31 May 2008, the Contractor shall submit a copy of the billing received for the “Billing of delivery up to 20 Apr 2008”.

73.5.19 Man-Year Entitlement The Contractor shall allocate MYE (Man-Year Entitlement), within 4 weeks

from the contract’s date of commencement, for prefabrication production work, including cages and spiral connectors, done by HDB or its appointed prefabrication term contractors. The Contractor shall distribute the MYE to HDB or its appointed term contractors in accordance to the following method of computation:

No. of MYE for HDB’s distribution = 0.9 x (Total MYE given by MOM) x (Value of Precast Components supplied by HDB or its appointed term contractors)/(Tender sum)

Charges, based on nuisance and irregularity clause, shall be imposed on the Contractor for failure to provide or late to provide MYE according to this clause.

The Contractor shall be responsible for any costs incurred by HDB to accelerate the production rate due to late assignment of MYE. The Contractor shall not be entitled to any EOT or Loss & Expenses claim for precast component delivery delay due to late assignment of MYE.

BSS S73 73-36 of 73-92



73.5.19 Man-Year Entitlement (Cont’d)

HDB's appointed term contractors shall conform to all MYE-related

regulatory requirements, e.g. purchase of bond for MOM etc. The contractor shall not impose additional requirements, e.g. request bonds, deposits or guarantee letters from HDB or its appointed term contracts for the MYE allocated. Any cost of added protection would deem to be included in the tender sum.

HDB reserves the right to lower the required MYE due to the higher prefabrication plant productivity.

73.5.20 Technical Requirements of Precast FerroLite Partition Wall In the event the Contractor opts to obtain the precast FerroLite partition

wall directly from suppliers in HDB’s Materials List instead of HDB, the technical requirements of the precast FerroLite partition wall shall also include, but not be limited to, the requirements as stipulated in this clause.

73.5.20.1 General

The Ferrolite partition wall is a patented product of HDB and royalty related payment is not applicable for the use of the FerroLite partition wall for HDB projects unless otherwise specified.

Details of the FerroLite partition wall shall comply with the Drawings. Standard fixing and connection details (including those for door frames) and guidelines on panelling and layout of partitions as shown in the Drawings shall be used. The partition walls shall be manufactured using ferrocement.

73.5.20.2 Materials to be Supplied by the Contractor

The Contractor shall supply all cast in items within the precast panels such as cast in steel plates, cast in MS U-channel, rubber padding, bolts, nuts and washers, polystyrene, etc. The Contractor shall check and verify by all means with respect to the actual position of electrical / water conduits or any other related items installed within or on the panels is in accordance to the building contract drawings before production commences. The Contractor shall also supply all the necessary steel reinforcement for component handling. The Contractor shall provide all necessary cast-in items for handling, transportation and/or strengthening purposes.

BSS S73 73-37 of 73-92


73.5 SUPPLY OF PRECAST COMPONENTS BY HDB (CONT’D) 73.5.20.3 Reserved 73.5.20.4 Quality of Precast FerroLite Partition Walls

The identification and date of casting shall be neatly and suitably marked

on all partitions, as soon as is practicable after casting.

(a) Inspection And Testing

The Contractors shall provide facilities for the SO Rep to inspect the preparation and concreting Works. For each concreting day, at least 1 sample shall be taken for the casting of 3 no. of 100mm cubes for compressive strength test. The SO Rep may, at his absolute discretion, instruct additional test cubes to be made from whichever batch as he may choose.

The 28 day strength shall be required for compliance with the strength specified hereunder. If the cube test results do not comply with any of the stipulated conditions, the Contractor shall carry out the required testing in accordance to the relevant clauses.

If the average compressive strength of 3 cubes falls below 37 N per

mm² at 28 days, the SO Rep reserves the right to reject the entire affected FerroLite partition walls subject to the testing in accordance to the relevant clauses.

BSS S73 73-38 of 73-92


73.5 SUPPLY OF PRECAST COMPONENTS BY HDB (CONT’D) 73.5.20.4 Quality of Precast FerroLite Partition Walls (Cont’d)

The cubes shall be tested at HDB or any other laboratory approved by the

SO Rep. For test cube that failed the compressive strength compliance, the SO Rep shall exercise his rights under Clause 1.6 "Nuisance and Irregularities" to impose charges against the Contractor.

Samples of welded steel fabric shall be taken at the factory for the following tests:

(i) strength testing and bar size measurement (SS32);

(ii) galvanized coating weight (The method of testing shall be in accordance with BS443).

(iii) Density of the panel.

Samples of precast partition walls shall be taken at the factory and subject to batch testing at a testing authority approved by the SO Rep, covering the following aspects:

(i) Dimension measurement of panel; (ii) Cover measurement after cutting the panel;

(iii) Density of the panel.

The Contractor is to submit the following details to the SO Rep for

approval before the manufacturing of precast FerroLite partition wall:

(i) Names of Suppliers;

(ii) Details of factories including addresses, size of workshops, equipment used and number of trained personnel;

(iii) Production process, curing and storage;

(iv) Mix design including foaming agent and dosage used;

(v) Test report by SAC accredited laboratories, on compliance with the technical property requirements as specified including subclause 3.3.1 "Technical Specifications";

BSS S73 73-39 of 73-92



73.5.20.4 Quality of Precast FerroLite Partition Walls (Cont’d)

(vi) Test reports on compliance with the drying shrinkage and total

water absorption (ISAT) requirements in accordance with SS 271. The test reports shall be dated within the validity period of six months prior to the date of submission of such reports to the SO Rep;

(vii) Mix proportions of cement mortar used. Admixture used to prevent shrinkage, efflorescence and cracking of cement mortar;

(viii) Quantity of lightweight partitions for each thickness in square metre;

(ix) Delivery schedules.

(b) Sampling Rate

Reinforcement shall be sampled once per contract, 3 bars of each size shall be taken per sampling as one sample. FerroLite partition walls shall be sampled at least once per contract, 3 pieces shall be taken per sampling as one sample.

(c) Passing Criteria

Tests shall be conducted on one specimen out of the three sampled.

If the specimen satisfies all requirements, the batch shall be deemed to satisfy the quality requirements.

If the specimen fails any of the quality requirements, tests shall be conducted on the remaining two specimens. If two or more specimens within a sample fail to meet a specific requirement, the material/product shall be deemed to have failed that specific requirement.

If the average result of the three specimens deviates from the required level by 15% or more, the batch of materials/products is deemed to have failed the specified requirements

73.5.20.5 Storage and Protection

At all times the precast partition walls shall be properly stored and

protected to prevent warping, bowing, cracking, chipping, staining and other Defect.

BSS S73 73-40 of 73-92



73.5.20.6 Submission of Manufacture Specifications, Drawings and Quality Control

The Contractor shall submit the necessary details, manufacture

specifications, production drawings, test reports and other relevant documents to SO Rep for approval prior to the production of the FerroLite partition wall. The Contractor shall ensure the compliance with all the technical and quality control requirements.

73.6 BASIN MIXER AND SHOWER MIXER The basin mixer shall conform to all the requirements as specified in

Clause 37.20.5 “Single Lever Basin Mixer and Accessories”. The basin mixer shall be SANITON or RIGEL or MIHENDO or any other approved subject to the approval of the SO’s Rep. Notwithstanding the SO’s Rep’s selection, the Contractor shall ensure full compliance to all the technical requirements.

The shower mixer shall conform to all the requirements as specified in Clause 37.20.8 “Bath/Shower Mixer and Shower-Set Assembly”. The shower mixer shall be SANITON or RIGEL or MIHENDO or any other approved subject to the approval of the SO’s Rep. Notwithstanding the SO’s Rep’s selection, the Contractor shall ensure full compliance to all the technical requirements.

BSS S73 73-41 of 73-92


73.7 APPENDIX A49 - DRAWINGS OF REFUSE BINS, LITTER BINS, BULK

CONTAINERS AND TROLLEYS This Appendix A49 shall be read in conjunction with Section 31 –

“Fabrication And Provision Of Refuse Bins, Litter Bins, Bulk Containers And Trolleys” of the Standard Specifications For Building Works And Other Installations.

BSS S73 73-42 of 73-92



CONTAINERS AND TROLLEYS (CONT’D)

BSS S73 73-43 of 73-92




BSS S73 73-44 of 73-92




BSS S73 73-45 of 73-92


73.7 APPENDIX A49 - DRAWINGS OF REFUSE BINS, LITTER BINS, BULK CONTAINERS AND TROLLEYS (CONT’D)

BSS S73 73-46 of 73-92




BSS S73 73-47 of 73-92


73.8 SUPPLIERS This clause shall supersede sub-clause 6.1.3 “Suppliers” of the Standard

Specifications For Building Works and Other Installations. The precast concrete components shall be obtained from suppliers

approved by the SO Rep. The list of approved suppliers is posted at the following websites: ml.eptc.sg

The Contractor shall submit the names of his suppliers, the written

contractual agreements between themselves and the suppliers and the quantities to be supplied by each supplier for the precast concrete components within four weeks from the date of the Letter of Acceptance. The written contractual agreement submitted shall include the detailed breakdown of precast component prices. The Contractor shall not be permitted to change his suppliers without the written consent of the SO Rep.

73.9 IRONMONGERY FOR HALF-HOUR FIRE RATED SOLID TIMBER

VENEERED ENTRANCE DOORS WITH DECORATIVE INLAY TO FLATS This clause shall supersede sub-clause 15.10.4 “Ironmongery For Half-

Hour Fire Rated Solid Timber Veneered Entrance Doors With Decorative Inlay To Flats” of the Standard Specifications For Building Works and Other Installations.

Where specified, provide and fix all ironmongery required to complete the

whole work in accordance with the following schedule subject to the approval of the FSSD. All ironmongery shall comply with SS 332 : 2007 and shall be at least half-hour fire-rated. The brand names specified in the schedule shall serve as a guide to the respective quality and profile of ironmongery required.

(a) Schedule The ironmongery items shall be : (i) 4 nos. 102mm x 76mm x 3mm solid brass hinges (satin finish)

with flat button tip and ball bearing complete with matching finish screws per door leaf.

BSS S73 73-48 of 73-92


73.9 IRONMONGERY FOR HALF-HOUR FIRE RATED SOLID TIMBER VENEERED ENTRANCE DOORS WITH DECORATIVE INLAY TO FLATS (CONT’D)

(a) Schedule (Cont’d) (ii) 1 no. "YTL" N28FIR-AT-US5; or "Accord" M4L10AB; or

"Posse" M4L10AB; or “BLIY”-N27-FIR-US5; or other approved mortice lever on backplate lockset with 5-pin single cylinder and thumb turn (key on the outside and thumb turn on the inside) and solid brass lever handles on plates on both sides. The finish shall be antique brass. The lever handle lockset shall be installed in a manner to clear the metal gate lockset.

(iii) 1 no. Brass rebated parts. (iv) 2 no. 240mm x 27mm wide antique brass finish flush bolt. (v) 1 no. Antique brass finish door viewer with privacy flap: (a) “YTL” 1827AB; or (b) “BLIY” 1827AB; or (c) “Accord” E3855 AB or other approved The position and details shall be as shown in the Drawings and to ensure that the door viewer shall not be obstructed by the entrance grille gate. The privacy flap shall be separated from the door viewer with a brass washer. (vi) 1 no. Approved slim line door closer with cushioned back

checking action shall be of bronze colour. (b) Keys For Locksets The lockset shall be provided with 3 sets of keys. These keys shall

be handed over to the Employer upon Substantial Completion of the Works.

(c) Grade Of Stainless Steel Unless otherwise specified, the grade of stainless steel shall be AISI

Grade 304.

BSS S73 73-49 of 73-92


73.10 SINGLE LEAF SOLID TIMBER VENEERED ENTRANCE DOORS WITH DECORATIVE INLAY TO FLATS (FOR NON FIRE-RATED DOORS)

This clause shall supersede sub-clause 16.4 (B) “Single Leaf Solid Timber

Veneered Entrance Doors With Decorative Inlays To Flats (For Non Fire-Rated Doors)” of the Standard Specifications For Building Works and Other Installations.

Unless specified otherwise, the ironmongery items for non fire-rated entrance

door shall be : (i) 4 no. 102mm x 76mm x 3mm solid brass hinges (satin finish) with

flat button tip and ball bearing complete with matching finish screws per door leaf.

(ii) 1 no. "YTL" N28FIR-AT-US5; or "Accord" M4L10AB or "Posse"

M4L10AB; or “BLIY”-N27-FIR-US5 or other approved mortice lever on backplate lockset with 5-pin single cylinder and thumb turn (key on the outside and thumb turn on the inside) and solid brass lever handles on plates on both sides. The finish shall be antique brass. The lever handle lockset shall be installed in a manner to clear the metal gate lockset.

(iii) 1 no. 240mm x 27mm wide antique brass finish flush bolt. (iv) 1 no. 90mm x 27mm wide antique brass finish flush bolt. . (v) 1 no. Antique brass finish door viewer with privacy flap: (a) “YTL” 1827AB (b) “BLIY” 1827AB (c) “Accord” E3855 AB or other approved The position and details shall be as shown in the Drawings

and to ensure that the door viewer shall not be obstructed by the entrance grille gate. The privacy flap shall be separated from the door viewer with a brass washer.

(vi) 1 no. Solid brass magnetic door holder : (a) "YTL" DH-027; or (b) "Accord" DH-027AB; or (c) "Nikon" DH-027AB; or (d) “Forte” H6DH75ES;or (e) other approved. The door holder shall be placed at the centre of bottom rail and its

position shall preferably be closer to the edge of the door subject to the approval of the SO Rep. The door holder shall be in antique brass finish.

BSS S73 73-50 of 73-92


73.11 INSTALLATION OF UPVC PIPE AND WIRE FOR PILE PENETRATION CHECKING

This clause shall supersede sub-clause 2.33.16 “Installation of UPVC Pipe

And Wire For Pile Penetration Checking” of the Standard Specifications For Building Works and Other Installations.

The Contractor shall install in all bored piles an approximately 16mm

Nominal Internal Diameter hollow UPVC pipe of approved quality with a prelaid 3mm diameter wire inside the UPVC pipe within each cast-in-situ pile. The Contractor shall be paid separately for the installation of these UPVC pipes with wires based on the pay length as a variation to the tender sum. The payment for the UPVC pipe with the wire shall be based on the pay length (measured from the specified cut-off level of the pile to the end of the pile) as recorded and verified in the “As-Built Pile Penetration Plan”. The UPVC pipe with prelaid wire shall be placed from the base of the bored hole to the ground level for checking the length of each completed bored pile immediately after concreting and capped.

The UPVC pipe shall include joints and stoppers at the top and bottom

ends of the pipe and the 3mm diameter wire shall be prelaid inside it from bottom of the pile to 0.5m above the cut off level prior to capping of the UPVC pipe. The prelaid wire, UPVC pipe thickness, glue length for joints, strength of pipe material and other qualities must be approved by the Superintending Officer's Representative before the commencement of work. Notwithstanding this, the pipe thickness and joint length between pipes shall be not less than 3mm and 150mm respectively.

The pipes shall be installed vertically and concrete counterweights shall be

used at the base of the UPVC pipe to ensure the verticality of the pipe. The Contractor shall ensure that the pipe is vertical and free from any obstruction which may prevent measurement of its length at a later date. The prelaid wire shall not be removed from the UPVC pipe and the contractor shall facilitate in the measurement of the pile length after the hacking of the bored pile to cut off level.

In the event that substantial ground water is present in the borehole and

the pile has to be formed by tremie concreting underwater or any other approved fluid, the Contractor shall not be required to install the UPVC pipe with wire.

BSS S73 73-51 of 73-92


73.11 INSTALLATION OF UPVC PIPE AND WIRE FOR PILE PENETRATION CHECKING (CONT’D)

The Contractor shall note that the Employer attaches great importance on

the condition of the UPVC pipes and prelaid wires. Where UPVC pipes are found choked or damaged or missing or without the prelaid wires during construction and pile penetration checking, the Contractor shall not be paid for the installation of these UPVC pipes with wires. In addition, during the conduct of pile penetration checking of selected piles for a block, a UPVC pipe is considered choked if the prelaid wire is unable to be extracted from the UPVC pipe for pile penetration checking.

For the payment of UPVC pipes with wires installed for this block, the

Contractor shall be paid only for the total pay length of UPVC pipes with wires installed in the block excluding UPVC pipes that are found choked or damaged or without the prelaid wires during construction and pile penetration checking. In addition, an administrative charge may be imposed on the Contractor for the chokage of UPVC pipes.

73.12 PENETRATION OF DRIVEN PILES This clause shall supersede sub-clause 2.36.1 “Penetration Of Driven

Piles” of the Standard Specifications For Building Works and Other Installations.

The pay length of driven piles shall be the actual length measured from the

bottom tip to the cut-off level of the driven piles. The penetration of every pile shall be recorded by the SO’s representatives and the Contractor and endorsed by the SO Rep. The concrete pile shall be marked with red paint at every 1m interval to enable easy determination of pile penetration.

The Contractor shall install UPVC pipe of approved quality and

approximately 16 mm diameter in all the precast piles as shown in the Drawing for Precast Reinforced Concrete Piles.

BSS S73 73-52 of 73-92


73.13 GENERAL REQUIREMENTS This clause shall supersede sub-clause 4.2.1 “General Requirements” of

the Standard Specifications For Building Works and Other Installations. Fine aggregates shall be uncrushed sand or crushed granite fines

complying with SS EN 12620. Where crushed granite fines are used, its percentage of the total amount of fine aggregates shall not exceed 30%. The upper sieve size (D) for fine aggregates shall be 4 mm.

Coarse aggregates shall be crushed or uncrushed gravel, crushed or

uncrushed stone complying with SS EN 12620. Coarse aggregates shall not exceed 40mm in size for lean and mass

concrete and 20mm for reinforced concrete, unless otherwise specified. All-in aggregates as specified in SS EN 12620 and aggregates derived

from limestone or other materials inferior to granite shall not be used. The upper sieve size (D) for coarse aggregates shall be 20 mm and the lower sieve size (d) shall be 4 mm.

Aggregates shall be stored on clean surfaces in separate stockpiles or

bunkers to prevent intermingling of different materials and contamination. Aggregates used for concrete batching plant on site shall be covered with a light roof cover. Fine aggregates shall be tested for moisture content constantly to facilitate moisture compensation during concrete production. The testing shall be carried out based on the Speedy method or other approved equivalent method approved by the SO Rep.

The SO Rep reserves the right to draw samples of aggregates from any

stockpile at any time and have them tested for compliance with Approved Standards of SS EN 12620, BS EN 933, BS EN 1097, ASTM C295 and ASTM C289. The samples shall be sent for testing at the HDB’s Engineering Materials Laboratory. Aggregates failing to comply with the Approved Standards shall be rejected.

BSS S73 73-53 of 73-92


73.14 GLAZED PORCELAIN FLOOR TILES FOR KITCHEN, SERVICE YARDS AND HOUSEHOLD SHELTER

This clause shall supersede sub-clause 19.5 “Ceramic Floor Tiles (Kitchen, Household Shelter, Service Yard, Bath/WC and WC” of the Standard Specifications For Building Works and Other Installations.

73.14.1 General (a) Location For Laying Glazed Porcelain Tiles Provide and lay glazed porcelain floor tiles to kitchen, service yards,

household shelter and to any other locations shown in the Drawings. The Contractor shall produce test reports from accredited testing laboratory to show compliance with the specified requirements. The test reports shall be submitted to SO’s rep before commencement of the sample unit.

(b) Sorting Of Floor Tiles In the event that the glazed porcelain floor tiles delivered to the Site

are inconsistent in sizes but fall within the allowable tolerances as specified in this clause including all sub-clauses under it, the tiles shall be sorted out into separate groups of compatible sizes to the satisfaction of the SO Rep. Tiles of one size group shall be laid in one area separate from tiles belonging to other size groups.

73.14.2 Approved Glazed Porcelain Floor Tiles The type of glazed porcelain floor tiles provided by the Contractor as

specified in this clause including all subclauses under it shall be subject to the approval of the SO Rep. Notwithstanding any approval by the SO Rep, the Contractor shall ensure that all such porcelain floor tiles for such locations as specified comply with the requirements as specified in this clause including all sub clauses under it.

73.14.3 Testing Requirements (a) Test Samples And Methods All test samples shall be randomly chosen from the same batch of

delivery by the SO Rep. The test methods shall be in accordance with the latest ISO 13006 ( Annex G ) unless otherwise stated.

(b) Test Certificates And Compliance Requirements Provide test certificates by a testing laboratory accredited under

SINGLAS to cover the tests mentioned in this clause including all subclauses under it and all other tests specified in the "Schedule Of Material Tests".

BSS S73 73-54 of 73-92


73.14 GLAZED PORCELAIN FLOOR TILES FOR KITCHEN, SERVICE YARDS AND HOUSEHOLD SHELTER (CONT’D) 73.14.4 Technical Specifications The body of the glazed porcelain tiles shall not be made of red clay.

Dimensional and surface quality requirements and physical and chemical properties shall be in accordance with the latest ISO 13006 (Annex G) unless otherwise specified :-

(a) Dimensions The dimensions shall be as follows : Nominal Length : 300mm Nominal Width : 300mm Nominal Thickness : 8 mm The dimensional tolerances shall be as follows :

(i) Length : Average length of each tile shall not deviate by more than ±1.0mm from the average length of 10 test specimens.

(ii) Width : Average width of each tile shall not deviate by more than ±1.0mm from the average width of 10 test specimens.

(iii) Thickness : Average thickness of each tile not deviate by more than ±0.5mm from the average thickness of 10 test specimens. Average thickness of 10 tiles shall not be less than 7.5mm.

(iv) Straightness Of Sides

: Maximum deviation of each tile shall not exceed ±1.0mm of the work size.

(v) Rectangularity : Maximum deviation of each tile shall not exceed ±1.0mm of the work size.

(vi) Flatness of Surface

: Maximum centre curvature of each tile shall not exceed ±1.0mm of the work size. The maximum edge curvature of each tile shall not exceed ±1.0mm of the work size. The maximum warpage of each tile shall not exceed ±1.0mm of the work size.



BSS S73 73-55 of 73-92


73.14 GLAZED PORCELAIN FLOOR TILES FOR KITCHEN, SERVICE YARDS AND HOUSEHOLD SHELTER (CONT’D) 73.14.4 Technical Specifications (Cont’d) (c) Physical Properties

(i) Water Absorption

: Shall be a maximum of 0.5%

(ii) Modulus of Rupture

: Minimum average strength shall not be less than 35 N per mm2.

(iii) Breaking Strength

: Not less than 1300 N


(d) Chemical Properties

(i) Staining Test : The procedure for carrying out the test is as follows: Allow 3 or 4 drops of each of the test solutions (Methylene Blue solution, 10g/L and Potassium Permanganate solution, 10g/L), to fall on a fresh part of the test specimen. Place an approximately 30mm diameter convex watch glass on the applied drop in order to spread it to an approximately circular area. Allow to remain for 24 hours and then rinse the surface with running water and wipe with a damp cloth. If a stain remains, thoroughly clean with a solution of the standard cleaning agent. Performance Criteria The stain test result shall be as follow : 1) Methylene Blue : Class 1 2) Potassium Permanganate : Class 2 Where Class 1 = Stain removed by water; Class 2 = Stain removed by cleaning agent

(ii) Resistance to household chemicals

: Minimum GB

(iii) Slip Resistance : The Slip resistance test method shall be in accordance with the latest SS 485. The test shall be conducted under wet conditions using a pendulum friction test method with a classification of Y. The test shall also be conducted under dry condition using dry floor friction test method with a coefficient of friction of minimum 0.4.

BSS S73 73-56 of 73-92


73.14 GLAZED PORCELAIN FLOOR TILES FOR KITCHEN, SERVICE YARDS AND HOUSEHOLD SHELTER (CONT’D)

73.14.5 Ceramic Tile Skirting to Service Yard Supply and lay 300mm x 80mm x 8mm matching ceramic tile skirting to

the service yard. The tile skirting shall match with the floor finish and shall be approved by the SO Rep.

73.14.6 Laying Of Floor Tiles Laying of floor tiles shall be in accordance with clause 19.7 “Laying Of

Ceramic Floor Tiles” including all subclauses under it. 73.15 CERAMIC FLOOR TILES FOR BATH/WC AND WC

This clause supersedes Clause 19.5 “Ceramic Floor Tiles (Kitchen,

Household Shelter, Service Yard Bath/WC and WC)” of the Standard Specifications For Building Works And Other Installations.

73.15.1 General (a) Location For Laying Ceramic Tiles

Provide and lay ceramic floor tiles to bath/wc, wc and to any other locations as shown in the Drawings.

The Contractor shall produce test reports from accredited testing

laboratory to show compliance with the specified requirements. The test reports shall be submitted to SO’s rep before commencement of the sample unit.

(b) Sorting of Floor Tiles

In the event that the ceramic floor tiles delivered to the Site are inconsistent in sizes but fall within the allowable tolerances as specified in this clause including all sub-clauses under it, the tiles shall be sorted out into separate groups of compatible sizes to the satisfaction of the SO Rep. Tiles of one size group shall be laid in one area separate from tiles belonging to other size groups.

BSS S73 73-57 of 73-92


73.15 CERAMIC FLOOR TILES FOR BATH/WC AND WC (CONT’D) 73.15.2 Approved Ceramic Floor Tiles The type of ceramic floor tiles provided by the Contractor as specified in

this clause including all subclauses under it shall be subject to the approval of the SO Rep. Notwithstanding any approval by the SO Rep, the Contractor shall ensure that all such ceramic floor tiles for such locations as specified comply with the requirements as specified in this clause including all subclauses under it.

Provide samples of ceramic floor tiles with the colour range as specified for

selection and approval by the SO Rep. 73.15.3 Testing Requirements (a) Test Samples And Methods All test samples shall be randomly chosen from the same batch of

delivery by the SO Rep. The test methods shall be in accordance with the latest ISO 13006 (Annex J) unless otherwise specified.

(b) Test Certificate And Compliance Requirement Provide test certificates by a testing laboratory accredited under

SINGLAS to cover the tests mentioned in this clause including all subclauses under it and all other tests specified in the "Schedule Of Material Tests".

BSS S73 73-58 of 73-92


73.15 CERAMIC FLOOR TILES FOR BATH/WC AND WC (CONT’D) 73.15.4 Technical Specifications The ceramic tiles shall not be made of red clay. Dimensional and surface

quality requirements and physical and chemical properties shall be in accordance with the latest ISO 13006 (Annex J) unless otherwise specified:

(a) Dimensions

The dimensions shall be as follows: Nominal Length : 200mm Nominal Width : 200mm Nominal Thickness : 7mm The dimensional tolerances shall be as follows :

(i) Length : Average length of each tile shall not deviate by more than ±1.0mm from the average length of 10 test specimens

(ii) Width : Average width of each tile shall not deviate by more than ±1.0mm from the average width of 10 test specimens

(iii) Thickness : Average thickness of each tile shall not deviate by more than ±0.5mm from the average thickness of 10 test specimens Average thickness of 10 test specimens shall not be less than 7.0mm

(b) Surface Quality

The tiles shall be free from objectionable surface blemishes such as


BSS S73 73-59 of 73-92


73.15 CERAMIC FLOOR TILES FOR BATH/WC AND WC (CONT’D) 73.15.3 Technical Specifications (Cont'd) (c) Physical Properties

(i) Water Absorption : Shall be a maximum of 6%

(ii) Modulus Of

Rupture : Minimum average strength shall not be less

than 22 N per mm2.

(iii) Breaking Strength : Not less than 1000 N


BSS S73 73-60 of 73-92


73.15 CERAMIC FLOOR TILES FOR BATH/WC AND WC (CONT’D) 73.15.4 Technical Specifications (Cont'd) (d) Chemical Properties

(i) Staining Test : The procedure for carrying out the test is as follows : Allow 3 or 4 drops of each of the test solutions (Methylene Blue solution, 10g/L and Potassium Permanganate solution, 10g/L), to fall on a fresh part of the test specimen. Place an approximately 30mm diameter convex watch glass on the applied drop in order to spread it to an approximately circular area. Allow to remain for 24 hours and then rinse the surface with running water and wipe with a damp cloth. If a stain remains, thoroughly clean with a solution of the standard cleaning agent. Performance Criteria The stain test result shall be as follows : 1) Methylene Blue : Class 2 2) Potassium Permanganate : Class 2 Where :Class 1 = Stain removed by water; Class 2 = Stain removed by cleaning

agent (ii) Slip

Resistance

: Slip resistant properties shall be required and test carried out for ceramic floor tiles to bath/WC. The slip resistance test method shall be in accordance with the latest SS 485. The test shall be conducted under wet conditions using a pendulum friction test method with a classification of X. The test shall also be conducted under dry condition using dry floor friction test method with a coefficient of friction of minimum 0.4.

BSS S73 73-61 of 73-92


73.15 CERAMIC FLOOR TILES FOR BATH/WC AND WC (CONT’D) 73.15.4 Technical Specifications (Cont'd) (d) Chemical Properties (Con'd)

(iv) Resistance to household chemicals

: Minimum GB

73.15.5 Laying Of Floor Tiles Laying of floor tiles shall be in accordance with clause 19.7 “Laying Of

Ceramic Floor Tiles” including all subclauses under it. 73.16 WALL TILES INSIDE DWELLING UNITS This clause supersedes Clause 20.12 “Colour Glazed Ceramic Wall Tiles

Inside Dwelling Units” of the Standard Specifications For Building Works And Other Installations.

73.16.1 Location For Laying Wall Tiles Provide and lay wall tiles to kitchen, bath/WC, WC and at other locations

as shown in the Drawings. 73.16.2 Approved Wall Tiles The type of wall tiles provided by the Contractor as specified in this clause

including all subclauses under it shall be subject to the approval of the SO Rep. Notwithstanding any approval by the SO Rep, the Contractor shall ensure that all wall tiles comply with the requirements specified in this clause including all sub-clauses under it.


delivery by the SO Rep. The test methods shall be in accordance with the latest ISO 13006 (Annex L) unless otherwise stated.


SINGLAS to cover the tests mentioned in this clause and all other tests specified in the “Schedule of Material Tests”.

BSS S73 73-62 of 73-92


73.16 WALL TILES INSIDE DWELLING UNITS (CONT’D) 73.16.4 Technical Specifications For Glazed Ceramic Wall Tiles The glazed ceramic wall tiles shall not be made of red clay. Dimensional and

surface quality requirements and physical and chemical properties shall be accordance with the latest ISO 13006 (Annex L) unless otherwise stated :

(a) Dimensions

Wall Tile Sizes (mm) Nominal Length 250 300 300 400 600 Nominal Width 200 200 300 200 300 Nominal thickness 7 8 8 8 9


(i) Length : Average length of each tile (2 or 4 sides) shall not deviate by more than ±0.3% from the average length of 10 test specimens.

(ii) Width : Average width of each tile (2 or 4 sides) shall not

deviate by more than ±0.3% from the average width of 10 test specimens.

(iii) Thickness : Average thickness of each tile shall not deviate by

more than ±0.5mm from the average thickness of 10 test specimens.

Average thickness of 10 test specimens shall not be less than the respective nominal thickness

(b) Surface Quality

The tiles shall be free from objectionable surface blemishes such as projections, depressions, flakes, hairline cracks and bubbles. The tiles shall be level and regular in size with properly formed corners and shall not be warped or deformed in any manner.

(c) Physical Properties

The water absorption shall be a maximum of 18%

BSS S73 73-63 of 73-92


73.16 WALL TILES INSIDE DWELLING UNITS (CONT’D) 73.16.4 Technical Specifications For Glazed Ceramic Wall Tiles (Cont’d) (d) Chemical Properties

(i) Staining Test The procedure for carrying out the test is as follows :

Allow 3 or 4 drops of each of the test solutions (Methylene blue

solution, 10g/L and Potassium permanganate solution, 10g/L), to fall on a fresh part of the test specimen. Place an approximately 30mm diameter convex watch glass on the applied drop in order to spread it to an approximately circular area. Allow to remain for 24 hours and then rinse the surface with running water and wipe with a damp cloth. If a stain remains, thoroughly clean with a solution of the standard cleaning agent.

Performance Criteria

The stain test result shall be as follows :

Methylene Blue : Class 2 Potassium Permanganate : Class 2

Where : Class 1 = Stain removed by water Class 2 = Stain removed by cleaning agent

(ii) Reverse Staining Test The procedure for carrying out the test is as follows :

(a) Five full pieces of tiles shall be selected and checked to ensure

that there are no Defect or damages. The tiles shall also be checked for signs of tonality difference.

(b) Dry the tiles in a ventilating oven at 105oC for 48 hours.

(c) With the top or glazed surface facing downwards, “pond” the

biscuit (i.e. back of the tile) with potable water over a circular area of 50mm diameter and with a water height of 25mm. At interval of every 5 minutes, inspect with the naked eye or prescription glasses if usually worn and under sufficient light intensity (> 300 lux), the top or glazed surface for signs of dark patches up to a total “ponding” duration of 30 minutes.

(d) Repeat the aforementioned test on another five pieces of tiles

but using methylene blue solution diluted at 2g of methylene blue per litre.

BSS S73 73-64 of 73-92


73.16 WALL TILES INSIDE DWELLING UNITS (CONT’D) 73.16.4 Technical Specifications For Glazed Ceramic Wall Tiles (Cont’d) (d) Chemical Properties (Cont’d)

(iii) Performance Criteria The tiles shall not show any sign of dark patches on the top or glazed surfaces. 73.16.4.1 Technical Specifications For Glazed Porcelain Wall Tiles (Accent

Tile) The glazed porcelain wall tiles shall not be made of red clay. Dimensional

and surface quality requirements and physical and chemical properties shall be accordance with the latest ISO 13006 (Annex G) unless otherwise stated:

(a) Dimensions

Wall Tile Sizes

(mm) Nominal Length 300 600 Nominal Width 300 300 Nominal Thickness 8 9


(i) Length : Average length of each tile (2 or 4 sides) shall not

deviate by more than ±0.3% from the average length of 10 test specimens.

(ii) Width : Average width of each tile (2 or 4 sides) shall not

deviate by more than ±0.3% from the average width of 10 test specimens.

(iii) Thickness : Average thickness of each tile shall not deviate by

more than ±0.5mm from the average thickness of 10 test specimens.

Average thickness of 10 test specimens shall not be less than the respective nominal thickness.

(b) Surface Quality

The tiles shall be free from objectionable surface blemishes such as projections, depressions, flakes, hairline cracks and bubbles. The tiles shall be level and regular in size with properly formed corners and shall not be warped or deformed in any manner.

BSS S73 73-65 of 73-92


73.16 WALL TILES INSIDE DWELLING UNITS (CONT’D) 73.16.4.1 Technical Specifications For Glazed Porcelain Wall Tiles (Accent

Tile) (Cont’d) (c) Physical Properties

The water absorption shall be a maximum of 0.5%

(d) Chemical Properties

(i) Staining Test The procedure for carrying out the test is as follows:

Allow 3 or 4 drops of each of the test solutions (Methylene blue

solution, 10g/L and Potassium permanganate solution, 10g/L), to fall on a fresh part of the test specimen. Place an approximately 30mm diameter convex watch glass on the applied drop in order to spread it to an approximately circular area. Allow to remain for 24 hours and then rinse the surface with running water and wipe with a damp cloth. If a stain remains, thoroughly clean with a solution of the standard cleaning agent.

Performance Criteria

The stain test result shall be as follow :

Methylene Blue : Class 2 Potassium Permanganate : Class 2

Where : Class 1 = Stain removed by water Class 2 = Stain removed by cleaning agent

BSS S73 73-66 of 73-92


73.17 CERAMIC WALL TILES (NON RESIDENTIAL UNITS AND COMMON

AREAS) This clause supersedes Clause 20.14 “Ceramic Wall Tiles (Non Residential

Units And Common Areas)” of the Standard Specifications For Building Works And Other Installations.

73.17.1 General Provide and lay wall tiles to locations as specified in the subclause

“Schedule Of Ceramic Wall Tiles “ hereunder and at other locations as shown in the Drawings.


delivery by the SO Rep. The test methods shall be in accordance with the latest ISO 13006 ( Annex J ) unless otherwise stated.


SINGLAS to cover the tests mentioned in this clause and all other tests specified in the “Schedule of Material Tests”.

73.17.3 Technical Specifications Dimensional and surface quality requirements and physical and chemical

properties shall be accordance with the latest ISO 13006 ( Annex J ) unless otherwise stated :-

(a) Dimensions

Wall Tile Sizes (mm) Nominal Length 200 300 Nominal Width 200 300 Nominal 7 8

BSS S73 73-67 of 73-92



AREAS) (CONT”D) 73.17.3 Technical Specifications (Cont’d) (a) Dimensions The dimensional tolerances shall be as follows :

(i) Length : Average length of each tile (2 or 4 sides) shall not deviate by more than ±0.5% from the average length of 10 test specimens.

(ii) Width : Average width of each tile (2 or 4 sides) shall not deviate by more than ±0.5% from the average length of 10 test specimens.

(iii) Thickness : Average thickness of each tile shall not deviate by more than ±0.5mm from the average thickness of 10 test specimens. Average thickness of 10 test specimens shall not be less than the respective nominal thickness



(c) Physical Properties The water absorption shall be a maximum of 6%.

BSS S73 73-68 of 73-92



AREAS) (CONT’D) 73.17.3 Technical Specifications (Cont’d) (d) Chemical Properties

(i) Colour Fastness And

Light-Fastness

: The t iles shall be light-fast and no colour change shall be detectable after exposure to ultra-violet radiat ion for 28 days.

(ii) Reserve

Staining Test

: The procedure for carrying out the test is as follows :

(a) Five full pieces of tiles shall be selected

and checked to ensure that there are no Defect or damages. The tiles shall also be checked for signs of tonality difference.

(b) Dry the tiles in a ventilating oven at 105oC

for 48 hours. (c) With the top or glazed surface facing

downwards, “pond” the biscuit (ie. back of the tile) with potable water over a circular area of 50mm diameter and with a water height of 25mm. At interval of every 5 minutes, inspect with the naked eye or prescription glasses if usually worn and under sufficient light intensity (> 300 lux), the top or glazed surface for signs of dark patches up to a total “ponding” duration of 30 minutes.

(d) Repeat the aforementioned test on

another five pieces of tiles but using methylene blue solution diluted at 2g of methylene blue per litre.

(e) Performance Criteria The tiles shall not show any sign of dark

patches on the top or glazed surfaces.

BSS S73 73-69 of 73-92



AREAS) (CONT’D) 73.17.4 Colours, Patterns And Textures Provide a full range of colours, patterns and textures of wall tiles for the SO

Rep to select from. 73.17.5 Accessories Provide and lay all accessories in matching size and colour to the approval

of the SO Rep. 73.17.6 Schedule Of Ceramic Wall Tiles Provide and lay glazed ceramic wall tiles to locations as specified below

including any other areas not specified but as shown in the Drawings.

Accommodation Location

All Housing Blocks

Walls at upper floor lift lobbies Walls at centralised Refuse chute hopper Wash areas at void deck Refuse Chute Chambers Walls in toilet adjoining Utility Room at ground floor lift

lobby 73.17.6 Tile Spacers Tile spacers shall be used for laying of w all t iles and f loor t iles to

achieve consistent joint w idth. The t ile spacers to be used shall be approved by the SO Rep before commencement of the t iling w orks.

BSS S73 73-70 of 73-92


73.18a SCHEDULE OF FINISHES FOR FLOOR TILES INSIDE THE DWELLING

UNITS 73.18.1 General Provide and lay floor tiles to locations as shown in the Schedule below and

including any other locations not listed in this Schedule but as shown in the Drawings. Or any other approved equivalent floor tiles subject to SO Rep’s approval.

The Contractor shall produce test reports from accredited testing laboratory

to show compliance with the specified requirements. The test reports shall be submitted to SO’s rep before commencement of the sample unit.

73.18.2 Schedule Of Finishes For Floor Tiles To Living Room, Bedroom And Dining

Room for Standard Flats


Polished porcelain tiles

600mm x 600mm x 10mm (Nominal

Size)

Glazed porcelain tiles

600mm x 600mm x 10mm (Nominal

Size) 2-Room and/or 3-Room and/or 4-Room and/or 5-Room

Living Room / Dining Room / Bedrooms

Guocera Code:

YTP6400NH

BSS S73 73-71 of 73-92


73.18a SCHEDULE OF FINISHES FOR FLOOR TILES INSIDE THE DWELLING

UNITS (CONT’D) 73.18.3 Schedule Of Finishes For Floor Tiles To Kitchen, Service Yard, Household

Shelter, Bath/WC and WC


Glazed ceramic tiles

200mm x 200mm x

8mm (Nominal

Size)

Glazed porcelain tiles

300mm x 300mm x

10mm (Nominal

Size)

Structured / Textured

Tiles

2-Room

Ramp at Main Entrance / Bathroom / WC

*

Kitchen Brand: MyGres Code: NV000

Bath/WC

Brand: Guocera Code: F865EH

Household Shelter

Brand: MyGres Code: NV000

3-Room and/or 4-Room and/or 5-Room

Ramp at Main Entrance / Service Yard / Bathroom / WC

*

Kitchen Brand: MyGres Code: NV000

Bath/WC

Brand: Guocera Code: F865EH

Service Yard Brand: MyGres Code: NV000

Household Shelter

Brand: MyGres Code: NV000

73.18b Reserved

BSS S73 73-72 of 73-92


73.19 SCHEDULE OF FINISHES FOR WALL TILES INSIDE THE DWELLING UNITS

73.19.1 General Provide and lay wall tiles to locations as shown in the Schedule below and

including any other locations not listed in this Schedule but as shown in the Drawings. Or any other approved equivalent floor tiles subject to SO Rep’s approval.

The Contractor shall produce test reports from accredited testing laboratory

to show compliance with the specified requirements. The test reports shall be submitted to SO’s rep before commencement of the sample unit.

73.19.2 Schedule of Finishes for Wall Tiles

Accommodation Location Glazed ceramic tiles Glazed porcelain tiles (accent)

2-Room and/or 3-Room and/or 4-Room and/or 5-Room

Kitchen Size: 300x600x10mm Brand: Guocera Code: PL801AA

Size: 300x600x10mm Brand: Hafary Code: 63201

Bath/WC Size: 200x400x9mm Brand: Guocera Code: PL1001H

Ceramic Tiles Size: 200x400x9mm Brand: MyDecor Code: LLE2046BET5

73.20 AIR-CON PIPE SLEEVE This clause supersedes Clause 36.20 “Air-Con Pipe Sleeve” of the

Standard Specifications For Building Works And Other Installations. Provide and install UPVC pipe sleeves in RC wall next to air-con ledge.

The pipe sleeve shall be complete with end cap on both sides and labelled with “OPENING FOR AIRCON PIPES” with a removable sticker. The drawing on pipe sleeve shall serve as a guide. The actual profile and fastenings of pipe sleeve shall be to manufacturer’s details. Contractor shall submit drawings and sample of pipe sleeve to SO Rep for approval.

BSS S73 73-73 of 73-92


73.21 PAINT This clause supersedes Clause 23.1.1 “Paint” of the Standard

Specifications For Building Works And Other Installations. The paints used shall be manufactured by an approved Specialist and

shall be approved by the SO Rep. All paint shall be delivered to the Site in their original containers and the containers shall not have been opened before.

Unless otherwise specified, all paint shall comply with the relevant

Singapore Standards shown below and their latest amendments : Standard Type of Paint SS7:1998 "Gloss Enamel Finishing" SS34:1998 "Undercoat for Gloss Enamel" SS37:1998 "Aluminium Paint" SS38:1998 "Aluminium Wood Primer (Leafing and Non-Leafing)" SS150:1998 "Emulsion Paint" SS345:1990 "Algae Resistant Emulsion Paint for Decorative

Purposes" SS494:2001 "Lead and Chromate-free Primer" SS 579:2012 “Water-based sealer for interior and exterior uses” Before the commencement of any painting work, provide and submit

colour charts of approved paint to the SO Rep for the selection of colour scheme.

All water based algae resistant emulsion paint shall comply with SS

345:1990. All enamel paint shall be synthetic enamel paint unless otherwise approved by the SO Rep.

BSS S73 73-74 of 73-92


73.22 ACRYLIC EMULSION PAINTS This clause supersedes Clause 23.2.3 “Acrylic Emulsion Paints” of the

Standard Specifications For Building Works And Other Installations. Unless otherwise specified, all external plastered, skim coated and

concrete surfaces, except those subjected directly to weathering as mentioned earlier, shall be painted with one coat of water based sealer and two subsequent coats of approved acrylic emulsion paint. Sealer coat and two coats of acrylic emulsion paint shall not be diluted. The whole paint system shall be obtained from the same paint manufacturer.

External surfaces to be painted with acrylic emulsion paint shall include all

surfaces except those within the enclosing walls of the dwelling units, switch rooms, motor rooms, pump rooms, water tank compartment and other enclosed spaces. However, walls and ceilings of the private balcony and/or service balcony of dwelling units and common access corridors shall be considered as external surfaces to be painted with acrylic emulsion paint.

Water-based sealer shall comply with SS 579:2012 and for the water

resistance requirement in SS 579:2012, test it to 500 hours. 73.23 Reserved

BSS S73 73-75 of 73-92


73.24 COLOURED LOW CAPACITY WC SUITE This clause supersedes subclause 37.20.4 "Coloured Low Capacity WC

Suite" of the Standard Specifications For Building Works And Other Installations.

(A) Scope Provide and install 2-tick (PUB’s Water Efficiency Labelling Scheme)

close-coupled low capacity WC suite to all the common and attached bathrooms of all flat types as specified in subclause 37.20.1 "Schedule Of Low Capacity WC Suite And Wash Basin" and other locations as shown.

The complete system of the close-coupled low capacity WC suite

including the WC bowl, cistern, internal parts and fittings forming the complete flushing mechanism, seat and cover, and all the necessary accessories needed for the proper installation and functioning of the WC shall be to the approval of HDB and also to conform with SS 42 "Quality of Vitreous China Sanitary Appliances", SS574 “Dual flush low capacity water closet (WC) up to 4.5/3.0 litres capacity”.

2-tick (PUB’s Water Efficiency Labelling Scheme) close-coupled low

capacity WC suite shall be operated with full flush capacity set close to 4 litres with S-trap or P-trap outlet as shown in the Drawings. The rigid plastic seat and cover with buffers and hinging device shall conform to SS 16:1985 "WC Seats (Plastic)", or its latest amendment. The coloured plastic seat and cover shall match the profile of the WC bowl and approved by the HDB. The whole pedestal WC suite including the internal parts and fittings forming the complete flushing mechanism and all the necessary accessories shall be assembled in the factory as a complete system before delivery to the Site.

The WC suite model shall have streamlined lower pan body and fully

concealed outlet with no visible WC trap profile. A copy of the user manual/maintenance instruction shall be supplied

with the WC and shall be affixed onto the WC using plastic bag and heavy duty adhesive tape.

BSS S73 73-76 of 73-92


73.24 COLOURED LOW CAPACITY WC SUITE (CONT”D) (B) Installation Fix the close coupled low capacity WC suite including rigid plastic

seat and cover with buffers, hinging devices and with all necessary accessories and associated works in accordance with the manufacturer's written instructions to enable the proper functioning of the system.

Fix the WC onto the floor using 4 no. of the original screws provided

together with the WC and seal the gap between the base of the WC and the floor with approved silicone sealant. The WC shall not be fixed using cement grout or using other type of screws. Any WC installed using a method not in accordance with the instructions of the manufacturer shall be dismantled and re-installed in accordance with the correct method.

73.25 DUAL-FLUSH LOW CAPACITY WC SUITE This clause supersedes subclause 37.20.7 "Dual-Flush Low Capacity WC

Suite" of the Standard Specifications For Building Works And Other Installations.

(A) Technical Requirements Unless otherwise stated, all WC suite shall be 2-tick (PUB’s Water

Efficiency Labelling Scheme) dual flush low capacity type. The complete system of the close-coupled dual-flush low capacity WC suite including the WC bowl, cistern, internal parts and fittings forming the complete flushing mechanism, seat and cover, and all the necessary accessories needed for the proper installation and functioning of the WC shall be to the approval of HDB and also to conform with SS 42 "Quality of Vitreous China Sanitary Appliances", Singapore Standards SS574 “Dual flush low capacity water closet (WC) up to 4.5/3.0 litres capacity”. It shall be certified to be rated in the PUB’s “Water Efficiency Labeling Scheme” (WELS).

The dual-flush low capacity WC shall enable a full flushing actuation

and a reduced flushing actuation. The full flushing performance of the dual-flush low capacity WC shall

comply fully with the SS 574.

BSS S73 73-77 of 73-92


73.25 DUAL-FLUSH LOW CAPACITY WC SUITE (CONT”D) (A) Technical Requirements (Cont’d) The reduced flushing actuation shall comply with the following

performance requirements:

Performance

Test

Criteria

Volume of water Discharged per reduced flush

SS 574: Part 1: 2012 Annex H

The cistern shall discharge a volume of water not more than 3 litres.

Endurance of flushing fitting

SS 574: Part 1: 2012 Annex I

The cistern shall not leak or show signs of defect, damage after 100,000 flushing cycles.

Discharge of colored water

Dilution test with aniline blue solution

No visible traces of colored water remaining in water seal

Loading on operating mechanism

SS 574: Part 1: 2012 Annex F

Shall not distort, and parts shall not become detached or inoperative.

Paper discharge

4 no of twin-ply toilet papers of 15,000mm² and of 40 g/m²

The toilet papers shall be fully discharged in at least 2 out of 3 tests.

The buttons for the actuation of the full and reduced flushing shall be

clearly marked to be easily distinguishable by users. The rigid plastic seat and cover with buffers and hinging device shall

conform to SS 16:1985 "WC Seats (Plastic)", or its latest amendment. The colored plastic seat and cover shall match the profile of the WC bowl and approved by the HDB. The whole pedestal WC suite including the internal parts and fittings forming the complete flushing mechanism and all the necessary accessories shall be assembled in the factory as a complete system before delivery to the Site.

The WC suite model shall have streamlined lower pan body and fully

concealed outlet with no visible WC trap profile. A copy of the user manual/maintenance instruction shall be supplied

with the WC and shall be affixed onto the WC using plastic bag and heavy duty adhesive tape.

BSS S73 73-78 of 73-92


73.25 DUAL-FLUSH LOW CAPACITY WC SUITE (CONT”D) (B) Installation Fix the close coupled WC suite including rigid plastic seat and cover

with buffers, hinging devices and with all necessary accessories and associated works in accordance with the manufacturer's written instructions to enable the proper functioning of the system.

Fix the WC onto the floor using the original screws provided together

with the WC and seal the gap between the base of the WC and the floor with approved silicone sealant. The WC shall not be fixed using cement grout or using other type of screws. Any WC installed using a method not in accordance with the instructions of the manufacturer shall be dismantled and re-installed in accordance with the correct method.

73.26 BATH / SHOWER MIXER AND SHOWER-SET ASSEMBLY This clause supersedes subclause 37.20.8 "Bath / Shower Mixer And

Shower-Set Assembly" of the Standard Specifications For Building Works And Other Installations.

The bath / shower mixer shall be 15mm dia (nominal) chrome plated;

ceramic disc cartridge operated; single lever mixer tap. It shall be complete with all necessary seals and nuts, firmly fixed and secured. 1-tick (PUB’s Water Efficiency Labelling Scheme) bath / shower mixer shall be used for HDB projects unless otherwise stated.

The Hot / Cold indicator shall be clearly visible. The indicator may either

be by colour coding and/or with character identification. Hot indicator shall be on the left and cold indicator on the right side.

The lever and the body shall be of chrome plated brass. The metallic

coating shall comply with BS EN 12540, Service Condition 2 with designation Cu/Ni10b/Crr. For any part of mixer that made of zinc alloy, the electrodeposited coating shall be Zn/Cu20/Ni10b/Crr.

The operation of the lever shall be smooth and effortless. The lifting of the

lever shall not leave any gap or opening which is likely to trap the finger and/or cause injury.

The mixer tap shall comply with BS EN 817 and approved by the SO Rep.

The mixer shall pass the PUB stipulated tests in BS EN 817.

BSS S73 73-79 of 73-92


73.26 BATH / SHOWER MIXER AND SHOWER-SET ASSEMBLY (CONT”D) Shower-set shall be complete with adjustable jet handset type of shower

head, flexible hose, and sliding bar, all in chrome finish. Flexible hose shall be of length 1.5m and of stainless steel or chromed brass. An adjustable shower head holder shall be provided on the sliding bar. Shower-sets provided shall also comply with the following requirements:

Characteristic / Properties

Requirements: BS 6340 Part 4-Specification for shower heads and related equipment

Nickel and Chromium plating on shower head and related equipment

Clause 9.2-Service condition 2A,

Classification PL/Ni 8b Cr r (8 micron min Full-bright Nickel and 0.3 micron min Regular Chromium)

Spray Trajectories Clause 13.1

Tensile Load test for Flexible Hose Clause 14.1 73.27 TESTING This clause supersedes clause 4.5.2 "Testing" of the Standard

Specifications For Building Works And Other Installations. The Contractor shall provide the SO Rep every facility for inspection and

sampling before any cutting, bending or other fabrication is undertaken. If deemed necessary, the SO Rep may cause samples to be taken from reinforcement already fixed in position.

Samples for the tests shall be sent for testing at the accredited laboratory.

For each sample, 3 bars shall be taken for testing. Reinforcement not complying with the appropriate Specifications shall be removed and replaced.

BSS S73 73-80 of 73-92


73.28 PERIMETER JOINTS FOR FLOOR TILES Perimeter joints shall be provided for living room, dining room and

bedroom floor tiles. The joints shall extend through the tiling and its beddings and shall be a minimum of 8mm wide. The joint shall be provided where the tiling abuts restraining surfaces such as perimeter walls, columns, kerbs etc.

A layer of water-based liquid applied flexible waterproofing membrane

shall be applied on the polyethylene joint fillers in accordance to the manufacturer’s recommendation. The flexible membrane shall only be applied after joint spaces are thoroughly clean, dry and free from any excess harden grout, debris and foreign materials. It shall be allowed to cure completely according to manufacturer’s guidelines before installing timber skirting. The flexible membrane shall not be visible upon fixture of timber skirting.

The joint fillers and flexible membrane shall be capable of accommodating

the movement without loss of adhesion to the side of the joints and be able to withstand normal service conditions. The joint fillers shall be rot-proof and non-absorbent. The Contractor shall submit the joint fillers, flexible membrane and method of installation to the SO Rep for approval prior to commencement of Works.

73.29 ALUMINIUM FALSE CEILING FOR FIRST STOREY LIFT LOBBY AND

LETTERBOXES AREA 73.29.1 Material All false ceiling at the first storey lift lobby entrance, letterboxes area and

other areas in accordance to tender drawings, shall be 600mm x 600mm x 0.7mm aluminium ceiling panels suspended and supported in accordance with the manufacturer's instructions and recommendations. Ceiling panels shall be perforated with 2.5mm diameter holes at 5.5mm centres, giving a 16% open area.

The false ceiling shall be in polyester powder coated or polyester stove

enamelled and to the colour approved by the SO Rep. Ceiling panels shall be provided complete with suspension system and fixing accessories, all in accordance with the manufacturers instructions and recommendations.

Provide all access panels and trim holes required for electrical fittings,

pipings, trunking and others, etc. All metal accessories to be used for the installation of ceiling panels shall

be in galvanised steel.

BSS S73 73-81 of 73-92


73.29 ALUMINIUM FALSE CEILING FOR FIRST STOREY LIFT LOBBY AND LETTERBOXES AREA (CONT’D)

73.29.2 Workshop Drawings The details shown in the Drawings shall serve as a guide only. The

Contractor shall submit complete set of workshop drawings showing reflected ceiling plan, sections, suspension systems, dimensions and details of access panels, electrical fittings and pipings/trunkings for the approval of the SO Rep.

73.29.3 Sample Samples of the ceiling shall be submitted for the approval of the SO Rep

prior to the installation. 73.29.4

Submission of Shop Drawings and Independent Professional Engineer’s Endorsement

All architectural features as shown are indicated to express the design intentions, the details shown in the Drawings shall serve as a guide only.

The Contractor shall submit complete set of workshop drawings and calculations to be endorsed by the independent Professional Engineer (PE) engaged at his own cost before commencement of works. The drawings shall show dimensions of the reflected ceiling plan, sections, suspension systems and fixing details to the building structure, dimension and details for access panels, locations of plasterstops, electrical fittings and pipings/trunkings for the SO Rep’s approval. No works shall commence before the SO Rep’s approval is obtained. The independent PE shall be fully responsible for the design and supervision of the works. Where applicable, the independent PE shall be responsible to obtain the Regulatory Authorities’ approval before commencement of the works. The Contractor shall submit a Certificate of Supervision to be endorsed by the independent PE within 1 week of completion of the works. The Contractor shall submit the required shop drawings and calculations early to the SO Rep, to allow time for checking and approval. The Contractor shall factor into his time schedule the required submissions to SO Rep and no claim shall be allowed for extension of time due to these submissions to the SO Rep. In the event the standards and/or size of members and/or number of fixings have to be upgraded/ increased to meet performance standards, there shall be no increase in cost.

BSS S73 73-82 of 73-92


73.30 ILLUMINATED ESTATE BLOCK NUMBER SIGNAGE In addition to providing such signages as specified in Clause 18.26

"Numeral Estate Block Number Signage", the Contractor shall also provide and fix two numbers of illuminated estate block number signages to the details as shown in the Drawings for each building block (including multi-storey carpark/garage block and precinct pavilion). The signages shall be located at the second storey beam and the position shall be decided by the SO Rep. For precinct pavilion, both the location and position of the signage shall be decided by the SO Rep. The actual block number shall be made known later in the course of the Works. The signage shall be double sided illuminated estate block number and shall be made from powder coated extruded aluminium frame with an eclipse sign face as shown in the Drawings. The signage shall have powder coated aluminium sign face cut out text mounted with 3-dimensional injection moulded plexiglas lettering/number. The thickness of the aluminium frame and aluminium sheet shall be as shown in the Drawings. The signage shall be reinforced with galvanised steel brackets as shown in the Drawings.

Submit shop drawings and a sample to the SO Rep for approval prior to

their installations. Provide and fix all electrical cables, ballast, lamp holders, fluorescent

tubes and other necessary lighting accessories including connection with wiring from the nearest connection box.

The powder coating shall be superdurable architectural powder coating and

shall comply with subclause 18.7 "Polyester Powder Coating On Aluminium ". The colour of the powder coating shall be approved by the SO Rep.

73.31 LIGHTNING PROTECTION TO METALLIC ROOFING SYSTEM, WALL CLADDING AND METALLIC MOTIFS For metallic roofing system or roof structure or wall cladding or metallic

motifs at the roof or envelope of the building, the whole metallic body and any individually isolated metallic parts shall be bonded to the main lightning protection system to comply with or otherwise satisfy the lightning protection requirements specified in Singapore Standard 555:2010.

The design (where applicable), manufacture and installation of such

metallic bodies or parts shall be carried out judiciously such as to ensure the electrical continuity of the whole metallic roofing or wall cladding or motifs by proper connections/joints and maintain its warranty. An adequate number of accessible bonding points shall be provided.

Upon completion, the Contractor shall submit to the SO Rep detailed

drawings showing the metallic roofing or structure or wall cladding or motif and the bonding to the main lightning protection system.

BSS S73 73-83 of 73-92


73.32 LAMINATED SAFETY GLASS FOR FIXED PANELS BELOW CILL

HEIGHT 73.32.1 Material Requirements All safety glazing to the fixed panels below the cill height, described under

this clause including all subclauses under it, shall be of 12.76 mm laminated glass comprising of 6 mm thick tinted float glass and 6 mm thick clear float glass cemented together with 0.76 mm thick clear polyvinyl butyral (PVB) interlayer with glazing gaskets and a shading co-efficient of 0.69, where shown in the Drawings. The tint of the glazing shall be the same as those of the remaining glass panels when viewed from the external and inner surfaces of the glass. The PVB interlayer shall be Saflex RA41 or Saflex RB41 or Butacite B52 or other approved.

The laminated glass shall be of Grade A and shall comply with the relevant

requirements in SS 341:2001 as specified hereunder : (a) Impact Test The glazing material tested in accordance with Annex A of

SS 341:2001 shall comply with the requirements for breakage given in Annex A.

(b) Boil Test When tested in accordance with Annex C of SS 341:2001, the glazing

material itself might crack, but no bubbles or other defects shall develop more than 12 mm from the edge of the test specimen or from any cracks that have developed.

(c) Flatness Of Glazing Panels The flatness of panels shall be within the following limits : (i) Localised warp 1.0mm over any 200mm span; (ii) Overall bow and warpage shall be in accordance with Table 3

“Flatness Limits for Glass of Standard Nominal Thickness” of SS 341:2001.

(d) Squareness Of Rectangular Panels The squareness of rectangular panels shall be such that the

difference between the two diagonals does not exceed 5mm for panels where the largest dimension is less than 1200mm and does not exceed 10mm for all other panels.

BSS S73 73-84 of 73-92


73.32 LAMINATED SAFETY GLASS FOR FIXED PANELS BELOW CILL HEIGHT (CONT’D)

73.32.1 Material Requirements (Cont’d) (e) Size Tolerances The tolerances on size of safety glass shall be as specified in Table 2

“Size Tolerance for All Safety Glass” of SS 341:2001. (f) Thickness Limit For Safety Glass The thickness limit shall comply with Table 1.1 “Thickness limits for

standard nominal thickness of glass” of SS 341:2001 73.32.2 Laminated Glass Supplier’s Logo The logo of the supplier which carry out the lamination of the glass panels

shall be imprinted on each and every panel of laminated glass supplied. 73.32.3 Design Loads The laminated safety glass panels shall comply with the Building

Regulations requirements - "Fourth Schedule for Parapets And Balustrades, Table 4". The laminated safety glass panels shall be designed to resist the loads stipulated in the said Fourth Schedule for Parapets And Balustrades, Table 4.

73.32.4 Professional Engineer's Calculations The Contractor shall submit his Professional Engineer's calculations for

the design of the laminated safety glass fixed panels and the aluminium framing for the fixed panels, to show compliance with the lateral load requirements of the Building Regulations.

73.32.5 Workshop Drawings And Samples The Contractor shall submit complete workshop drawings for all glazing

and aluminium Works with PE calculations and endorsement for the approval of the SO Rep prior to its fabrication and installation. Complete samples shall be installed at the Site for approval by the SO Rep.

73.32.6 Replacement In the event of damage arising from breakage, chips and delamination,

replacement shall be immediately carried out all at the cost and expense of the Contractor.

BSS S73 73-85 of 73-92


73.33 ADDITIONAL TESTING OF MATERIAL

1.

Grout for splice sleeve

Compression

1 test per casting day per building block

3 cubes per test

2.

Anchor bolt for a) false ceiling b) safety barrier

a) Pull-out b) Pull-out

a) 5 tests per building block. b) 10 tests or 2% of total bolts

installed per building block, whichever is greater.

a) 1 bolt per test. b) 1 bolt per test.

3 Glazed porcelain wall tiles (accent tile) inside residential units

a) Length and width b) Thickness c) Surface flatness d) Surface quality e) Water absorption f) Breaking strength g) Modulus of rupture h) Staining Test i) Resistance to household chemicals

) ) ) ) 1 test per colour ) ) ) ) ) )

) ) ) ) 1 set per ) test. ) ) ) ) )

73.34 Supply of Precast Components

HDB shall produce, store and supply these components directly from its Woodlands plant or from its appointed Precast Term Contractors’ plant to the worksite. For the interpretation of Clause “Supply Of Precast Components By HDB”, reference to HDB may also include HDB’s appointed Precast Term Contractors. In the event there is discrepancy in the components markings or ambiguity in the types of components to be supplied by HDB, the Contractor shall seek clarification during the tender stage. List of precast components and its quantities to be supplied by HDB or its appointed precast term contractor will be provided to the Contractor during construction stage.

73.35 Items To Be Provided By The Contractor

The Contractor shall be deemed to have included in the tender price the cost of supply, delivery, labour, etc., for the following items to HDB:

(a) All necessary additional bracing reinforcement and accessories for

site handling and erection for all precast components (excluding MS grout tube and four cast-in inserts for bracing per precast component);

(b) All proprietary lifting anchors for handling and installation of precast

elements;

(c) All necessary additional reinforcement and rebar connectors in precast components for tower crane tie-backs;

BSS S73 73-86 of 73-92


73.35 Items To Be Provided By The Contractor (Cont’d)

(d) All cast-in fixtures or accessories for site safety provisions or for

securing of formwork;

(e) All clothes drying racks, trap doors, cast-in window frames, accessories or parts, such as stainless steel base plates or supports, threaded rods, etc., that are to be cast into the precast components for connection of metal structures, railings and all other fittings.

(f) All cast-in accessories for services, inclusive of services pipes, electrical casings and conduits for concealed wiring for casting into the components. The Contractor shall coordinate and obtain the necessary confirmation from HDB before delivering the above items to HDB.

(g) All accessories which are not cast-in with the precast component and

are necessary for the completion of the works in accordance to the Standard Specifications For Building Works, such as, Rockwool/woodwool insulation used in the construction of the Lift Machine Room, steel angle plates required for connections of FerroLite partition wall, etc.

(h) FerroLite Partition Wall

The Contractor shall provide steel angle plates, drive pins/masonry nails/anchor bolts, tie plates and timber wedges for installation works of the precast partition wall and precast lintol. This includes all welding works, alignment check, placing of temporary timber wedges and grouting of joints. The Contractor shall provide and install the 3mm tie plates (at locations indicated in the drawings) required for connection of one wall component to the adjacent wall components or lintol after grouting of all joints. All depressions at the walls where the tie plates are located are to be filled with Fibre Polymer Modified Filler so that the final surface is flushed with the final wall surface. Fibre Polymer Modified Filler shall be of suitable use on concrete or lightweight concrete and masonry joints. It shall have elongation properties with a minimum flexural strength of 1.0N/mm2 (at locations indicated in the drawings).

In addition to the placing of temporary timber wedges and welding of the steel angle plates to the u-channel in the precast partition wall, the 3mm tie plates may also serve as a secondary temporary propping/support/alignment tool for the lintol or walls just before grouting of all joints. The Contractor shall provide all metal door frames, brackets for fixing of door frames, steel holdfast, PVC conduits for concealed wiring and electrical sockets. All steel components used shall comply with Section 17 “Structural Steelwork”.

BSS S73 73-87 of 73-92


73.35 Items To Be Provided By The Contractor (Cont’d)

(h) FerroLite Partition Wall (Cont’d)

The Contractor shall supply all materials (including the fibre glass tissue/coating to seal the vertical joints) used to form the vertical joints of the partition wall as indicated in the drawings. Fibre glass tissue used shall be of C glass, continuous 16 micron monofilament 25g fiber glass tissue, containing water and solvent based compatible binder resin. The Contractor has the option to use alternative material such as polymeric plaster coating to seal vertical wall joints of the partition wall, as well as for coating or repair of surface hairlines/cracks on concrete components. Polymeric plaster used shall comprise carbon fibre and acrylic resin for anti crack surface treatment with minimum bending strength of 5 N/mm2 and compressive strength of 22 N/mm2. The sealing of the vertical joints shall be in accordance with the manufacturer's procedures and instructions. The Contractor shall obtain the necessary approval from the SO Rep for the above item and its method of application.

73.36 FerroLite Partition Wall FerroLite partition wall, which are non-structural, may be found within

residential units. For the 75mm thick FerroLite partition wall components of 300mm width

and 600mm width which are made up of 2 individual panels assembled together, the area shall be based on projected area from the elevation view of the precast component and shall be measured on one face only based on the assembled component. When the length of each face is different, the area will be based on the longer length.

For the 75mm thick FerroLite partition wall components of T-shaped & L-

shaped which are made up of 1 individual panel which have more than one projected area in different directions, the measurement shall be the sum of these projected area created by combination of overlapping flat parts. With reference to Reference Drawing Part 3, the computed area for the T-shaped wall or L-shaped wall is [(L1 x H)+ (L2 x H)].

For the purpose of calculation of projected area of the FerroLite partition

wall, the full height of the actual precast component shall be used. There shall be no deduction in the projected area due to openings.

BSS S73 73-88 of 73-92


73.37 Manufacturing Requirements

The FerroLite partition walls shall be manufactured to satisfy the requirements as specified hereunder.

(A) Technical Specifications – Materials (General Standards)

(a) Cement Cement shall be Ordinary Portland Cement of an approved brand and manufacturer and shall comply with SS26.

(b) Fine Aggregates

Fine aggregates shall be natural sand or crushed stone sand complying with SS31. Alternatively, Recycled Concrete Aggregates (RCA) fines of sizes not more than 7mm can be used to replace the natural sand for up to a maximum quantity of 30% by weight. The RCA fines shall comply with SS EN 12620. The RCA shall be obtained from recycling plants listed in the NEA website.

(c) Water Water used for mixing concrete, washing formwork and curing of

concrete shall be potable water supplied by the PUB.

(d) Reinforcement The reinforcement to be provided in each individual wall panel

shall consist of:

(i) 300mm and 600mm width Two layers of φ1.5mm galvanized fine mesh (with galvanized coating weight In accordance with BS443) at 25mm spacing.

(ii) L-shaped and T-shaped

One layer of φ3.25mm fine mesh at 50mm spacing. The galvanized wires shall be galvanized with a zinc coating

weight of 65 g per m² minimum. The wires shall have a minimum proof stress of 300 N per mm². Steel reinforcement shall be welded steel fabric complying with SS32. The Fine Mesh Fabric shall be obtained from sources approved by the SO Rep.

(e) Admixtures Admixtures shall comply with SS320 or BS5075.

(f) Bolts

Bolts used shall be galvanized M10. The bolts, nuts and washers shall comply with Section 17 “Structural Steelwork”.

BSS S73 73-89 of 73-92


73.37 Manufacturing Requirements (Cont’d)

(A) Technical Specifications – Materials (General Standards) (Cont’d)

(g) Rubber Padding Rubber pads/sheets used shall have a minimum Shore “A” hardness of 60.

(h) Steel Plates

Steel plates used shall comply with Section 17 “Structural Steelwork”.

(i) Fibreglass Tissue

Fibreglass tissue used shall be of C glass, continuous 16 micron monofilament 25g fiberglass tissue, containing water and solvent based compatible binder resin.

The Contractor has the option to use alternative material such

as polymeric plaster coating to seal vertical wall joints of the partition wall, as well as for coating or repair of surface hairlines/cracks on concrete components. Polymeric plaster used shall comprise carbon fibre and acrylic resin for anti crack surface treatment with minimum bending strength of 5 N/mm2 and compressive strength of 22 N/mm2.

(j) Fibre Polymer Modified Filler

Fibre Polymer Modified Filler shall be of suitable use on concrete or lightweight concrete and masonry joints. It shall have elongation properties with a minimum flexural strength of 1.0N/mm2.

BSS S73 73-90 of 73-92


73.37 Manufacturing Requirements (Cont’d)

(B) Technical Specifications – Design Specifications

(a) Wall Dimension

Details of the FerroLite partition walls shall comply with the Drawings.

(b) Mix Design

The FerroLite partition walls shall be cast from a mix design which complies with the following requirements:

(i) minimum cement to sand ratio by weight of 1:2

(ii) maximum water to cement ratio by weight of 0.45

(iii) air dry density of hardened concrete (including steel) not

less than 2200 kg per m³

(iv) 28 days average cube strength of three cubes not less than 37 N per mm².

The amount of admixture in the mix design shall be in

accordance with the manufacturer's instruction. Before commencing the manufacture of precast partition walls, submit a proposed mix design to the SO Rep for approval.

(v) Dry shrinkage not exceeding 0.09% when tested to

SS271

(vi) Total water absorption not exceeding 23.5% when tested to SS271

BSS S73 73-91 of 73-92


73.37 Manufacturing Requirements (Cont’d) (C) Technical Specifications – Manufacturing

FerroLite partition walls shall be cast using steel moulds in horizontal

position, or using steel battery mould in vertical position to conform to the shapes, lines and dimensions of the partitions to be produced. All reinforcement shall be adequately supported with approved spacers. The mould shall be sufficiently rigid to achieve the casting tolerances, shapes, thickness and surface finishes as specified (for combined panels):

(a) Casting Tolerance: (i) Height: ±5mm; (ii) Width: ±3mm in 600mm along the width; (iii) Thickness: ±3mm; (iv) Bowing/Warpage: 5mm in 2m along the height; 2mm in 600mm along the width.

(b) Shape

The shape and location of the connection between panels after casting shall be correct and accurate such that the offset between two adjacent panels after installation is within 2mm on both faces of the partitions and the width of the resultant joint between any two adjoining panel is (10+ 2) mm.

(c) Thickness

75mm/90mm (combined panels) for panels at internal dwelling unit

(d) Surface Finishes The surface finish of partition shall be smooth, free from defect,

excessive voids, visible cracks, chipping-off and unevenness.

A smooth surface shall be defined as one with no voids or bug holes greater than 7mm in diameter within a 50mm border around the edges of the panels. For the remaining centre portion, the number of air voids greater than 1.5mm and smaller than 3mm in diameter shall not exceed 20 in any 100mm × 100mm square. No void greater than 3mm in diameter shall be allowed.

BSS S73 73-92 of 73-92


73.37 Manufacturing Requirements (Cont’d) (D) Other Technical Requirements

(a) The FerroLite partition walls shall be provided with openings for

services where required or as specified by SO rep.

(b) All electrical and water services shall be installed between the panels. The panels shall be bolted and combined in the factory.

(c) The accuracy of the shapes and locations of the joints of the

partitions after casting should be checked to ensure that the offset between any two panels after installation is within 2mm on both faces of partitions.

(d) No partition is delivered prematurely to the Site before sufficient

strength has been gained to withstand stresses due to transportation, handling or erection.

(e) Provision of adequate supports for partitions to prevent chipping

off of panel edges during transportation and handling.

wol n7c34 supplementary specifications section 73

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