final-briefing material arch-guide 2 dec10-1

7/27/2019 Final-Briefing Material Arch-Guide 2 Dec10-1

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Supervision Guide

for

Architectural Works

Tan Eng SengSenior Project Manager


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Outline

1. Materials Approval and Control

2. Trade Demonstration

3. Timber Mock Up

4. Sample Units

5. In-process Supervision Works

6. CONQUAS


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HDB Material List provides a comprehensive selection ofproducts needed for the HDB construction projects

ML listed in website http://ml.eptc.sg

Products selected must comply fully with technicalspecifications, functional and performance requirements

1. Materials Approval and Control
http://ml.eptc.sg/http://ml.eptc.sg/


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Approved materials are to

be displayed in sample

display room

Facil itate verification of

materials approved by

Consultant against those

installed on site

Display of Approved Samples


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Provisions in specifications for a Schedule of

Material Tests (SMT) to be conducted

Ensure that all tests are carried out according to

SMT

Testing of Materials

Sample marked before send to lab

Element of surprise

A form needs to be attached to

the samples specifying

- Required tests

- Test reports to be sent to

consultant and contractor


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Test results verified

by Consultant

Testing of Materials

Report stamped and

endorsed by

consultant before filing


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Sample

a) Quality control on materials

b) Complies with contractual obligation

c) Material tests are carried out timely, at appropriate interval

d) Monitor of test reports/results

Material Register


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Trade demonstrations to be conducted for architectural trades

prior to mass production

MassProduction

SampleUnit

TradeDemonstration

WorkMethod

2. Trade Demonstration

Architect is responsible for inspection and approval of tradedemonstration

Ensure works are carried out according to specifications and

drawings

Understanding and agreement on the work method andworkmanship standards

Enable supervisory staff know what to look out for during the

mass production stage


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1. Approving work method by Consultant beforetrade demonstration

2. Briefing by contractor for understanding andagreement of work method

3. Conducting trade demonstration at actual

work area to simulate real work situation

4. Refining approved work method during tradedemonstration if necessary

5. Distributing work method to supervisory stafffor supervision

6. Displaying trade demonstration photo inmeeting room for reference

Procedures for Trade Demonstration


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Painting to ductile iron pipe

Specs require two coats of leadand chromate free primer to be

applied before painting

Ductile iron painted without 2

coats of primer on site

No approved work method and

trade demonstration

No trade demonstration


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On site

1st coat is painted with algae resistancepaint and not water based sealer

Work method approved by Consultant does

not comply with specifications

Wrong approval of work method

External painting work

Specs


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Trade Demonstration

Requirements :

Ensure all approved work methods comply with drawings

and specifications

Conduct trade demonstrations for all trades

Set the standard for work procedures and workmanship

Highlight to supervisory staff key processes to look out

for during the mass production

Document all the trade demonstrations on site


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To be constructed within 3 months after

commencement of work

To identify and resolve any design discrepancies,

maintenance issue and practicality of layout

To confirm the sanitary fitt ings and M&E services

arrangement before the approval of precast

workshop drawings

3. Timber Mock Up for Kitchen and Toilet

Water heater point

located above toi let

door entrance during

sample unit

inspection

Heater point


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Sample unit

4. Sample Units

Sample units to be constructed for all flat types :

Ensure unit type is constructed according to specifications & drawings

Eliminate any discrepancies between drawings and sales brochures

Minimise subsequent design adjustment

Serve as visual reference for workmanship standard for f inishing works


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Sample unit to be completed within 3 months

when structural work reaches the 5th storey

Milestones for Sample Units

(eg for a typical 20-storey

development, the sample units are to

be completed between 12 to 14

months after commencement of

contract )

Arrange with HDB to view the sample

unit

5th sty


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eg non-conformance to sale brochures

Position of scupper drain at sample unit is different from sales

brochures

Sample unit

Scupper drain shown in sale brochures

Sale brochures

Scupper drain align with door frame


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eg. non-conformance to guide drawing

Base plate of metal gate is different from guide drawing

Sample unit

Perforated type used

Guide drawing

Non-perforated type


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Tiles at main entrance ramp is different from specif ications

Eg non-conformance to specifications

Smooth glazed t ile used

SampleBuilding specification

Textured /structured tile

is specified


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eg. functionality

Gate hits bell point

when fully opened Cut-tile at bedroom entrance

Bedroom


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eg. functionality

Grilles is narrow anddifficult to turn crescent

lock

Lighting & heater switches for toilet

located near window

x


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Comply to

Sales brochures

Guide drawings

Schedule of finishes

Quality Standards in specifications

Safety, functionality and maintenance

Sample Units


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5. In-process Supervision

Establish guidelines on frequency of checks

Must check /sampling checks (eg)

waterproofing for bathroom/kitchen

functional test tiling work

timber flooring

timber door installation

painting cement block laying etc


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Develop checklist to guide

SS in their supervision

Develop Quality inspection

form for in-process

supervision and to record

observations

Checklist / inspection form

Checklist

Inspection record


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Managing Irregularities

Has a framework to manage and follow up irregularities

Norm or t ime frame for contractor to follow with non-compliance

Investigate

cause

Take corrective

action

Put control measures

in place

Non compliancedetected


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Actively involved in raising CONQUAS Score of project :

Be trained and familiarized with CONQUAS 21

Work with HDB to seek commitment from Contractors

Senior Management

Design to CONQUAS eg avoid detailing that demand

highly skilled workers

Conduct pre-assessment of completed works before

contractor book for BCA assessment

6. CONQUAS


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Conclusion

Consultants are required to develop their QualityManagement System to meet HDB requirements. The QMSshall cover the following:

a) Accountability and responsibility of the project team insupervising the project

b) Duty of the project team in inspecting the works atdifferent stage of construction

a) Quality control system ( eg checklist , inspection andtesting records) and guidelines for in-processsupervision works


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Thank you


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Control of Material TestingA

B

3 pull-out wall tile tests are required for each block

Test carried out in tandem with progress of work

3 pull-out wal ltile tests are required for each block

Only 1 pull-out test was conducted


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Membrane applied on rough surface

Example of non-compliance for critical trades

Membrane applied on smooth surface


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Example of non-compliance for critical trades

No buttering on tile back

Adhesive is evenly spread

properly tamped


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Window frame setting

Window frame set in resulted in many

cut-tiles

Window frame flushed with wall tile

Detailing to improve CONQUAS Score


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Cut-tiles below beam

Small cut-tile below beam


No cut-tile below beam

Depth of beam not tie-in with door height


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Corners/edges at beam and wall

Many edges and corners


Minimum corners/edges


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Spray water at constant

rateSeepage

Water tightness test to

windows and wall joints to

ensure no seepage

Functional Tests

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