gs_4_mason_stone_cladding_work.doc

General SpecificationSection 4 -

Mason & Stone Cladding Work

SECTION 4 - MASON & STONE CLADDING WORK

PART 1 - MASON

4.1.1 Generally

4.1.02 Samples

4.1.03 Sand, Lime, Cement and Water

4.1.04 Cleaning Down and Protection

4.1.05 Veneer Masonry

4.1.06 Granite for Masonry Walls & Thick Facings

4.1.07 Rubble Masonry Generally

4.1.08 Uncoursed Square Rubble Masonry

4.1.09 Squared Rubble Masonry Brought Up to Courses

4.1.10 Regular Coursed Rubble Masonry

4.1.11 Rubble Masonry Retaining Walls Generally

4.1.12 Ashler (Dressed Stone) Masonry

PART 2 - STONE CLADDING WORK

4.2.01 Scope of Works

4.2.02 Submissions

4.2.03 Responsibilities, Performance Criteria and Tests to be Conducted

4.2.04 Material and Workmanship

4.2.05 Fabrication

4.2.06 Installation and Erection

4.2.07 Handling and Protection

4.2.08 Cleaning

4.2.09 Spares

4.2.10 Maintenance Manual and As-Built Drawings

P&T-document.doc NovNov 2012 2012



SECTION 4 - MASON & STONE CLADDING WORK

INSTRUCTION FOR USE

Particular Clauses

4.1.05 Veneer Masonry

Specify Type, Quality of Stone for Veneer Masonry (Marble, Slate, Granite, Onyx etc.) and who supplies it

4.1.06 Granite for Masonry (Definition)


4.1.08 Uncoursed Rubble Masonry (Include 4.1.07)

4.1.09 Squared Rubble Masonry (Include 4.1.07)

4.1.10 Regular Coursed Rubble Masonry (Include 4.1.07)


Note :

Include 4.1.07 and 4.1.08 for Uncoursed Rubble Retaining Walls

Include 4.1.07 and 4.1.09 for Squared Rubble

Retaining Walls

Include 4.1.07 and 4.1.09 for Regular Rubble

Retaining Walls

4.1.13 Thick Stone Facings to Concrete Walls

Note :

The type of stone facing as detailed above must be included, e.g. 4.1.12 for Ashlar, 4.1.07 and 4.1.09 for Squared Rubble etc.

P&T-document.doc - NoNov 2012v 2012



SECTION 4 – MASON & STONE CLADDING WORK

PART 1 MASON

4.1.01 Generally

All materials shall be of the best quality obtainable and shall be of the thicknesses, and sizes shown; free from flaws, defects, stains and blemishes.

4.1.02 Samples

A sample of each type of material to be used, not less than 100mm x 150mm in size shall be furnished as soon as practicable after signing of the Contract, the cost of the sample including delivery charges being borne by the Contractor. On approval of this sample, all subsequent material supplied shall be equal in all aspects.

4.1.03 Sand, Lime, Cement and Water

These shall be as specified under 'Plasterer and Pavior'.

4.1.04 Cleaning Down and Protection

At completion of the work, all surfaces shall be cleaned down and pointed. (All masonry wall and floor finishes shall be protected with building paper and other surfaces with building board or timber with all edges cased until completion of the Contract when the protection shall be removed and all surfaces cleaned, waxed and buffed to approval). Any stonework that may be damaged on delivery or during the erection of the building is to be removed and replaced at the Contractor's expense.

4.1.05* Veneer Masonry

Veneer masonry shall be of butt/ bevel/ square reveal Joints between slabs according to detail drawings and shall not exceed 1.5mm and shall be fixed with proprietary colour grout as specified under section 10 Plaster and Pavior. Deviation in level over the whole face of veneered wall or floor shall not exceed 6mm. The faces of adjacent slabs shall be precisely laid in the same plane so that adjacent edges line up. Maximum allowable deviation shall be 0.5mm in this case.

P&T-document.doc - S4/1 - NoNov 2012v 2012



Veneer masonry wall slabs are to be fixed by suitable fixing method to withstand the weight of the slabs as well as the movement of the building structure. Acceptable fixing method includes proprietary adhesive system full mortar bed of non-shrinking grout or else with a void of not less than 12mm on Plaster of Paris dabs so spaced that each slab is supported by not less than five dabs. The slabs are to be fixed with dowels and cramps of adequate strength of bronze, or stainless steel internally, but only stainless steel externally. A sample of these shall be submitted as soon as practicable after signing of the Contract, the cost being borne by the Main Contractor. On approval of this sample all subsequent material supplied shall be equal in all aspects.

Veneer masonry floors shall be fixed with fast setting thick bed proprietary tile adhesive as specified in Section 10 Plaster and Pavior, on top of cement sand screeding minium 25mm thick or minimum 75mm cement sand screeding reinforced with wire net. For wet areas, a layer of cementious based water proofing to be applied on cement screeding laid to required fall before fixing of stone. Any mortar stains left on surface of slabs after slabs are set shall be removed with a weak solution of muriatic acid and then thoroughly rinsed with clean water or by method specified by manufacturer of proprietary tile adhesive and colour grouting.

4.1.06 Granite for Masonry Walls and Thick Facings

All granite shall be of good and uniform colour, free from vents, holes, red streaks, vein and all other flaws and defects, equal in all respects to sample blocks to be submitted to the Architect and approved by him.

Each stone is to hold its full size, dressed square to the back and beds and with joints worked to true right angles.


Each stone shall be dressed square to the back on the beds and side joints, the surfaces being plane to within 10 mm. The face shall be rough hammer dressed to a regular convex surface.

All stonework is to be built in cement mortar as described in 'Bricklayer'. The mortar shall be liberally applied so as to ensure that no cavities remain in the bed or at the joint, care nevertheless being taken to ensure that the faces are not stained. The beds and joints shall be between 6mm and 16mm in thickness. Care shall be taken to ensure that vertical joints are not continuous (i.e. the joint between two stones at the same level shall be covered by the end of the stone above).




The beds and joints shall be raked out on the face to a depth of at least 12mm as the work proceeds and pointed to a neat flush, weathered and recessed or keyed joint as required.

No stone shall exceed 300mm in height, or be less than 150mm long on bed. The length on bed shall in each stone be greater than the height.

Where walls are less than 300mm in thickness and faced on both sides, the facework as described shall be carried through the full thickness of the wall, the facings on both sides being securely bonded together with cement mortar with bond stones carried through the full thickness of the walling regularly spaced at intervals of not less than one per square metre.

Where walls are greater than 300mm in thickness and faced on both sides or where walls are faced on one side only, the hearting or backing may be of random rubble masonry or brickwork, the whole being solidly bonded together in cement mortar, with bond stones carried through the full thickness of the wall regularly spaced at intervals of not less than two per square metre. Care shall be taken as work proceeds to ensure that no cavities remain between the hearting and facing.

Where masonry walls join reinforced concrete structures, they shall be securely bonded together as specified in 'Bricklayer'.

4.1.08 Uncoursed Square Rubble Masonry

Uncoursed squared rubbed masonry shall be as specified above, a generally random effect, without pattern or courses being required. The top of the wall only shall be brought to an even horizontal line.

4.1.09 Squared Rubble Masonry Brought Up to Courses

Squared rubble masonry brought up to courses shall be all as specified, but with the facework brought up to level horizontal courses at intervals of not greater than 750mm.

4.1.10 Regular Coursed Rubble Masonry

The stone and workmanship for regular coursed rubble is to be all as specified for uncoursed squared rubble masonry, but all stones in any one course are to be of even height, the height of the courses varying from 175mm to 250mm. The bond stones in each course are to be regularly spaces so that each bond stone is midway between the bond stones of the courses immediately above and below.





All retaining walls shall comply with regulations 76-84 of the Hong Kong Building (Construction) Regulations, 1990.

Rubble faced retaining walls shall have a face of squared rubble masonry brought up to courses generally as specified, but the size of individual stones may be increased. Horizontal bond courses of 1:2:4 concrete 300mm thick, shall be provided as indicated in the drawings, the outer face of the concrete being flush with the face of the pointing of the granite walling.

Weep holes of 75mm internal diameter earthenware or concrete pipes, extending the full thickness of the wall, shall be provided at 1.8M centres horizontally and 1M centres vertically. The weep holes in alternate levels are to be regularly spaced so that each weep hole is midway between these in the levels shown above and below.

Dry rubble stone at least 300mm thick shall be hand packed behind the retaining wall.

Regular coursed masonry retaining walls shall be generally as specified above, except that the granite face shall be coursed, but need not be rough hammer dressed to a regular convex surface. Pointing shall be weathered.

Dry stone retaining walls shall be constructed of roughly dressed granite blocks, wedged in position with granite wedges to ensure that each stone is secure. Any walls in which it is found that stones or wedges can be moved will be demolished and re-erected.

Concrete bond courses as specified under rubble faced retaining walls shall be provided as indicated in the drawings.

4.1.12 Ashlar (Dressed Stone) Masonry

The stones for the facework of ashlar masonry are to be fine punched on the face to a true and even surface, accurately squared back and fine punched on the beds for the full thickness of the stone so as to produce a joint not exceeding 3mm thick, and similarly squared back and dressed 75mm on the joints, the whole being solidly bedded in cement mortar.

Each course is to be of equal height, and will be not less than 225mm and greater than 450mm.




The thickness of ashlar facing is, except where otherwise specified, to be 150mm for the stretchers, with 300mm thick headers spaced at regular intervals in each course of not less than one per square metre.

Where walls of 300mm or less in thickness are to be ashlar faced both sides, the ashlar work is to be carried through the full thickness of the wall and the facings on both sides properly bonded together.

In the case of walls exceeding 300mm thick which are to be faced both sides, or walls which are to be faced on one side only, the hearting or backing may be uncoursed squared rubble, but in such cases the headers are to be carried as bond stones for a minimum of two-thirds of the thickness of the wall.




PART 2 - STONE CLADDING WORK

4.2.01 SCOPE OF WORKS

The works included the design, supply and installation of the stone cladding works in accordance to the design intent provided by the Architect. The scope of works of contractor is decribed below but not be limited to:

4.2.01.1 The Design of Stone and Fixing

(A) To furnish informations and samples to assist the Architect in selection and confirmation of the best sources of stone.

(B) Prepare all detailed shop drawings to meet the Architect's outline design drawings in respect of stone pattern and sizing.

(C) To design metal framework, where required for the support and fixing of stone cladding.

4.2.01.2 Supply of Stone

(A) For each area of stone specified, select one suitable quarry with adequate material of the best matching colour and acceptable consistency.

(B) Before installation of any stoneworks that adjoin existing ones, the material should be laid for visual inspection and approval by site staff before any actual installation works commence.

4.2.01.3 Testing

The contractor shall allow for carrying out of:

(1) All testings which may be required to satisfy the Building Authority for obtaining approval of structural plan and/or consent to commencement of works.

(2) All site testings which may be required by Building Authority as specified in Building Regulations, PNAPs or as imposed conditions of approval or consent.

(3) All testings to material as required in this specification or tender drawings.




4.2.01.6 Visual Mock-up

Prior to placement of order of stone material, visual mock up shall be erected on site or off site as approved by the architect. Unless specified otherwise, visual mock up shall comprises at lease 2 nos. of 600x600mm panels for each type of stone material, Detail of visual mock up such as panel configuration and joint detail shall be agreed with Architect.

4.2.01.5 Provide Non - staining Sealants

Select for the Architects approval, sealants that are compatible with the stone selected.

4.2.02 SUBMISSIONS

4.2.02.1 At Tender Stage

The Tenderer shall submit with the tender the following :

(A) Location of the quarries that are capable of supplying, without unacceptable variations, the quantities of stones specified.

(B) A programme showing a logical sequence from the date of order, the time required for quarrying, transportation to factory, shop drawings and design preparation, submission to the local authorities (if required), cutting and finishing and delivery to the site for installation through to completion.

(C) The Tenderer shall submit a written guarantee agreeing to replace or repair defective materials and workmanship within a period of 10 years commencing from the end of the 12 months' defects liability period of the Main Contract. The guarantee shall include sealants performance and their compatibility with stone.

4.2.02.2 After Award of Contract

(A) Visit to the Factory

The Contractor shall allow for minimum two representatives from the Architect and the Employer to visit the factory where the blocks are cut to ascertain the acceptability of the materials and manufacturing facilities.




(B) Submission Programme

The Contractor shall submit a programme to outline the dates of major submissions for agreement with the Architect. The contractor shall diligently follow the agreed programme to carry out submissions and resubmissions.

(C) Shop Drawings

The Contractor shall provide complete detailed shop drawings and cutting lists showing details of support, bonding, jointing, setting and anchorage. The drawings shall indicate dimensional details of joints, together with location and details of all fixing attachments and inserts. The Contractor shall also provide building elevations showing location of individual units by piece mark from shop drawings. Shop drawings and cutting lists shall be prepared with dimensions in metric units and text in English.

The review of the Architect will not relieve the Contractor from any of the responsibilities and requirements as specified in this document.

(D) Structural Calculations

The Contractor shall submit full structural calculations and fixing methods proposed for the external and internal stone.

(E) Government Submission

The Contractor shall prepare all drawings and calculations and submit to the Buildings Authority for approval (if required) and when requested, conduct load and other tests. Where required under the Buildings Regulation, approval and consent shall be obtained before the commencement of installation work. Any delay caused by late approval or consent will be the sole responsibility of the Contractor.

(F) Range Samples

For each type of stone specified, submit 3 sets of actual panels of size 600mm x 600mm extracted from the selected quarry showing the range of colour variations. The Architect shall determine the acceptable variance and shall return one set of the approved stones to the Contractor for use as manufacturing control samples. The other set shall




be kept on site as control panels. All stone delivered to the site and found not to be within the approved range shall be rejected.

(G) Joint Samples

Sample of joints shall be submitted for review and approval.

(H) Fixing Metal Samples

Submit for review 2 sets of all types of fixings proposed by the Contractor before commencement of manufacture, inclusive of shim plates, angle plates, spring clips, lock-nut and bolts etc.

(I) Sealants

The Contractor shall submit samples of sealant caulked between 2 stone panels for the Architect to select the colour. The Contractor shall furnish detailed technical specification of the sealant to the Architect. Review of the type of sealant does not release the Contractor's responsibility in selecting a suitable sealant. When required by the Architect, sealant with non-standard colour to be used, sample of non-standard colour sealant shall be submitted within 6 weeks after confirmation of colour code.

(J) A Detailed Construction Programme

The Main Contractor's to prepare a detailed programme of work for the stone supply and installation.

(K) Method Statements for Site Installation and Quality Control

Detailed step by step method statements for:-

(1) Setting out.(2) Transportation of stone.(3) Structural surface preparation if necessary.(4) Installation of fixings i.e. drilling, installation of

s.s. shims, angle plate, anchors and bolts, inclusive of testing (pull-out test) of anchors.

(5) Installation/replacement of stone.(6) Testings.(7) Protection of stone before completion.

4.2.03 RESPONSIBILITIES, PERFORMANCE CRITERIA AND TESTS TO BE CONDUCTED




4.2.03.1 Design Responsibility

(A) The specification and the design drawings of the stone are for the sole purpose of defining the design intent and performance requirements. The tender drawings shall indicate the preferred arrangement of elements and their approximate sizes.

The details and minimum stone thickness are to show aesthetic standards only and do not purport to identify or solve structural and performance problems such as wind pressure, thermal/structural movement, building tolerance, fixings adequacy and anchorage, and etc. The contractor shall allow for stone slab with thickness greater than the minimum thickness specified or stone back fixed undercut anchor shall be adopted where required to satisfy the structural calculation.

(B) Shop Drawings

The shop drawings shall be a set of fully designed and dimensionally co-ordinated drawings prepared by the Contractor incorporating all considerations relating to wind pressure, thermal/structural movement, fixings adequacy, buildability, etc. and shall meet the design and aesthetic requirements of the contract. Shop drawings shall show all joints and joint sizes designed to accommodate movement, expansion etc.

(C) Structural Calculations

All calculations must be in accordance with current version of Buildings Regulations and PNAPs. Due allowance must be made for expected wind loads where the areas are in an external or semi-external condition. The Contractor shall submit the following structural calculations for the Architect to review. These calculations will be submitted to the Building Authorities, if required.

(1) Based upon the tolerance specified in Clause 4.2.03.4, the physical characteristics of the stone offered, the Sub-Contractor is to establish that the thickness proposed for external stone is adequate.




(2) The analysis of all fixing types, specified in the shop drawings, all plates, bars, shims, pins, anchors and bolts.

The entire external stone cladding system, including all fixings, shall be designed to a minimum factor of safety of 2.

(D) Building Regulations and Codes

(1) The design of the stone fixings shall comply with requirements and Building Regulations and Codes.

(2) The design of the stone fixings shall as a minimum requirement, comply with wind load effects in accordance with Building Regulations.

(3) The Contractor shall be responsible for the preparation of the design calculations and all other information as required for the submission to and approval and obtain consent to commencement of works.

4.2.03.2 Abbreviations

The following abbreviations are used in this specification:

AISA American Iron and Steel AssociationANSI American National Standards InstituteASTM American Society for Testing of MaterialsFS Federal SpecificationBS British Standard InstitutionJIS Japan Institute of Standards

4.2.03.3 Design Wind Pressure

For external and semi-external stone works, minimum design wind pressure, both positive and negative, acting normal to the plane of the wall shall be according to wind load effects in accordance with Hong Kong Building Regulations.

4.2.03.4 Building Tolerances

In designing the fixing system, assume that the position of the surfaces and edges of insitu concrete surface can vary up to 25mm in any direction, from the normal design position shown on the drawing, the detail tolerance specifications for insitu construction.




4.2.03.5 Building Movement

The stone system design shall take into account the following:

(A) Estimated maximum vertical movement.(B) Estimated maximum horizontal movement.(C) Maximum beam deflection.

4.2.03.6 Thermal Movement

Make provision for expansion and contraction resulting from exterior surface temperature range of - 0oC to +71oC.

Make allowances for horizontal and vertical movements.

4.2.03.7 It is stressed that the data in Clauses 4.2.03.6 must be taken into consideration when recommending the thickness of stone and Tenders are expected to show details and calculations justifying the thickness chosen, to the Architect's approval.

4.2.04 MATERIAL AND WORKMANSHIP

4.2.04.1 Stone Specification

(A) Types of Stone

Types of stone to be referred to drawings & Particular Specification.

(B) Sources of Stone

(1) All materials supplied for each type of stone specified, shall be sourced from one quarry unless otherwise approved by the Architect in writing.

(2) The supplier shall supply the name and address of the quarries concerned for each type of stone specified.

(3) The blocks from the quarry shall (preferably) be cut from a selected portion of the bed. All blocks cut shall be numbered and a record drawing should be prepared, showing the locational source of the blocks at the quarry.

(4) The stone blocks shall be processed by factories with good reputation & experience.




(C) Physical Characteristics of Stone Materials

The Contractor is to supply details of the physical characteristics of the stones offered, obtained from a recognised independent laboratory. The physical properties required are listed below:-

(1) Compressive strength(2) Absorption(3) Flexural strength (Ultimate tensile strength by

bending)(4) Shear strength(5) Coefficient of thermal expansion(6) Weight(7) Frictional wear test(8) Knoop microhardness(9) Compressive strength (after freezing)(10) Impact resistance test(11) Elasticity modulus(12) Chemical resistance

The Contractor is to confirm that the material to be supplied are suitable for use in the environmental conditions prevalent in Hong Kong.

(D) Tolerances and Dimensions

(1) Stones shall be to sizes as shown in the approved shop drawings.

(2) Stones shall be square and variations of face dimensions shall not exceed 1mm in 900mm.

(3) Variation of thickness on any stone panel shall not exceed 2mm.

(4) Bow and twist shall not vary from the finish plane by 1mm in 1200mm.

(5) Notches and holes shall not vary from the designed location by more than 2mm. The size of slots and holes shall not be greater than the designed value by 1mm.




(E) Finishes to Stone

All finishes are to be approved by the Architect. Finish samples are required.

All stone panel edges exposed to view shall be finished as specified above whether or not the finishes have been indicated on the drawings.

(F) Forming of Stones

(1) Mortices, sinkings, perforations and notches for fixings should be formed in the factory, unless otherwise approved.

Care should be taken in the fabrication to avoid stunning and fractural damage to the surrounds of the mortices.

(2) All mitred joints as specified for all corners of the building shall be formed in the factory, to show only a hairline joint. The mitred joint shall be securely bonded with epoxy resin and reinforced with s.s. cramps or additional stone pieces, to the Contractor's design.

(3) All stone polishing including slab edge polishing shall be carried out in the factory.

(4) Unless otherwise approved by the Architect, pin fixings shall not be utilised for the securing of the stone panels to the building structure.

(5) The Contractor shall allow all stone panels forming an arc or circle on plans, elevations or sections be true curved panels instead of facetted ones.

(G) Pattern of Stones

The stone panels shall be laid as indicated on the drawings. The Contractor shall make special arrangement for numbering, delivery and installation of these panels to achieve the patterns.




(H) Water Repellent Sealer / Impregnator

All dry fixed stone slab to be treated on all sides with suitable breathable water repellant sealer/impregnator. Except the surfaces in contact with adhesive material, all wet fixed stone slab to be treated on all sides with suitable breathable water repellant sealer/impregnator. Sealer/impregnator shall be transparent and shall not cause any change in colour or finishing to stone and shall not affect bonding to substrate. All sealer/impregnator application to be carried out in factory and in accordance with recommendation of manufacturer.

4.2.04.2 Metals

(A) External and Semi-external Stone Fixing Metals

All metals to be stainless steel type BS EN 10048, BS EN 10095, BS EN ISO 9445-1, BS EN ISO 9445-2 grading not inferior to 304 S15, unless otherwise approved by the Architect in writing.

(B) Internal Stone Fixing Metals

Metal fixings to stone in :

(1) Toilet or Wet Areas :

Only stainless steel is to be used.

(2) Internal Stone Ceilings (if any) :

Metal framing to be mild steel structural sections in accordance with B.S. 4 and B.S. 4360 or stainless steel.

All mild steel to be protected with anti-galvanic moisture barrier materials to GSA specifications FS-TT-PG45 for zinc chromate primer, or alkyd alkyl resistant bituminious paint to FS-TT-C494 type II or galvanised steel hot dip to ASTM A-123-73 or B.S 2989 or BS EN ISO 14619. Electrogalvanising to ASTM A-165-71 type NS. All metals cut or worked on after galvanising, to be treated with Expandite Galvafroid SB.

(3) Internal Stone Walls :

Metals to be stainless steel. All bolts, anchors and tie back to be stainless steel.




4.2.04.3 High Strength Mortars: for External use on S tructure

(A) For site repairs, jointing filling, patching of concrete surfaces that are not true, or level to receive anchor bolts, only mortars that develop high strength rapidly should be used.

(B) Materials approved are SBD Certite or approved equivalent.

4.2.04.4 Mortar

Mix mortar in small batches. Mix cementitious materials and aggregate with a minimum amount of water consistent with satisfactory workability, until homogenous. Use mortar within 2 hours after mixing. No partially set or retempered mortar is permitted for use.

4.2.04.5 Cement

All cement to be portland cement to British Standard B.S. 12. For pointing of joints, white or coloured cements shall be approved by the Architect.

4.2.04.6 Sand

All sand to be clean, sharp, washed sand. Sand with organic or inorganic impurities would be rejected. Sand shall comply with B.S. 882/1207.

4.2.04.7 Cushions

1.5mm thick clear plastic spacers, or 1.5mm lead sheets or approved equivalent.

4.2.04.8 Pigments

To be best quality mineral pigment, of high purity, finely ground, sunproof and specific gravity similar to Portland Cement. The colour will be selected by the Architect.

4.2.04.9 Sealants

(A) The proposed sealant should comply with the relevant international standards and should be totally compatible to the types of the stone to which it is applied. The sealant should remain intact without staining to stone, deterioration or leaking oil in the condition it is to be used.




(B) Sealants shall be High Range Sealants with maximum cyclic movement capable of 12% to 25% capable of performing well under dynamic loads.

(C) Colour to be selected by the Architect.

(D) All sealants to be identified and located by product name on shop drawings.

(E) Unless otherwise recommended backer rods shall be polyethylene foam sponge neoprene conforming to ASTM C509.

Backer rods shall be non-wicking, non-gasing and non-hygrosocopic. Diameter size of the rod to be at least 25% larger than joint width.

(F) Products must be compatible with granite and aluminium. Site tests shall be conducted before the final acceptance of sealant.

(G) Sealants shall not stain granite, masonry or any materials in contact, testing report to confirm the non-staining performance to every sealant and stone material combination shall be submitted before placement of order for sealant.

4.2.04.10 Anchors

Anchors to be "Hilti" stainless steel expansion anchors, stainless steel chemical anchors or equivalent approved by the Architects.

4.2.05 FABRICATION

4.2.05.1 General

(A) Cutting

Accurately cut, dress, drill, fit and finish stone work to shapes and dimensions shown. Make exposed plane surfaces true in line.

(B) Joints

Cut with edges square and at right angles to face; make arises straight, sharp, true, and continuous at joints.




(C) Anchorage

Cut and slot stones in shop as required for supports, anchors, ties, bolts, and other inserts.

(D) Expansion

Allow for expansion and contraction within limits of joint material when cutting for anchorage devices.

(E) Sizes

Sizes required for the panels will be as indicated on the approved shop drawings.

Tenders should be based on the overall size shown, however, alternative recommendations will be considered.

(F) Finish

The finish to stone panels under this Contract, shall be as described in specification or drawings, to all exposed faces and exposed edges unless otherwise noted.

No surfaces shall be rubbed over with any wax, oil, silicones, stains, polish or other surface applied materials.

4.2.06 INSTALLATION AND ERECTION

4.2.06.1 General

(A) The Contractor shall be wholly responsible for the installation of the stone works.

(B) The Contractor is to erect the stones in accordance with the approved shop drawings, provide all labour, materials, equipment, accessories and supervision necessary to complete the installation.

4.2.06.2 Adjustability of Steel Fixings

All fixings should be designed to allow adjustability in 3 directions, to accommodate the building frame constructional tolerances as specified.




4.2.06.3 Tolerances and Setting Out

(A) The stone work shall when completed be within the following tolerances.

(1) Deviations from plumb, level or dimensional angle; 1.5mm per 3 metres of length of any member or 6mm in any total run in any line.

(2) Maximum offset from the true alignment between two (2) consecutive members placed end to end must not exceed 1.0mm edge to edge.

(B) The Contractor shall recheck and confirm the bench marks and datum levels and grid set outs. The Contractor shall be wholly responsible for the accuracy of the same and shall at his own cost rectify any errors arising from inaccurate setting out.

4.2.06.4 Dry Fixing Stone onto Vertical Surfaces

(A) Set out and Surface Preparation

Set out on site and establish all levels and planes for the entire surface with piano wires and other approved methods.

Locate the positions of fixing angles by survey and ensure that all concrete surfaces in contact with metal angles shims etc. are flat and suitable to receive fixings by the Contractor.

(B) Installation of Anchors

Locate the position of anchor. Drilling holes shall be carried out by experienced and skilled workers.

Install the anchor to manufacturers specifications. Test all the anchors to 1.5 times design load for pull out before installation of the metal fixings.

(C) Installation of Fixing Metals

Install shims, plates, support angles, check for level and adjust to position. Install the spring lock washers, tighten, apply a liquid lock agent to prevent nuts loosening.




(D) Installation of Stone Panel

Install the stone panel onto bearing angles and install restraint pins check for tolerances between installed panels, as specified in the shop drawings.

(E) Panels shall not support vertical load unless otherwise approved by the Architect.

4.2.07 HANDLING AND PROTECTION

4.2.07.1 Delivery from Factory

All stone panels shall be padded braced and protected on faces and edges so that they will not be damaged during transportation and handling. Tenderers are to describe the methods to be adopted.

4.2.07.2 Site Storage

(A) Unless delivered to the installation area, stone shall not be uncrated.

(B) Crated stone shall be stocked on platforms and covered to prevent damage from other works at site. Any damage by improper storage shall be replaced at the cost of the Contractor.

(C) The Contractor is to note that limited space will be available for material storage. The Contractor shall be responsible for all costs of off-site storage and double handling as necessary.

4.2.07.3 Handling on Site

(A) Panels shall be carefully delivered to the proposed area of installation in crates. Manual handling or movement of the panels should be minimised.

(B) Panels should be stacked in properly designed, timber frames after uncrating at the site of installation.

(C) Stone panels should preferably be put in protective frames and mechanically moved during installation.




4.2.07.4 Protection

(A) General

The Contractor shall provide and fix protection against weather, damage and staining by other trades, particularly against staining from timbers, oil, wet straw, washings from steelwork, scaffolding, concrete washings and other injurious substances.

(B) All installed internal granite or stone panelling is to be protected with a minimum of 1000 guage polythene sheeting taped, framed and protected at edges with timber battens.

(C) All internal granite or stone paving is to be protected upon completion and curing, with a minimum 1000 gauge polythene sheeting, and 3mm plywood panelling, laid edge to edge and taped together.

For heavy traffic areas, a minimum 6mm plywood should be used.

4.2.08 CLEANING

(A) The Contractor shall clean down all installed surfaces with cleaning agents compatible with the stones installed.

(B) Cleaning Schedule

(1) All surfaces are to be cleaned on removal of protection and prior to the issuance of a Certificate of Practical Completion. (Reasonable and safe access should be provided to the Architect for inspections.)

(2) In the one year defects liability and maintenance period, the Contractor shall allow for the cost of cleaning all surfaces once, for the inspection of defects, prior to the issuance of the Final Certificate.

4.2.09 SPARES

Prior to the issuance of the Certificate of Practical Completion for the building, the Contractor shall provide spares of stone slab material specified by the Architect.

4.2.010 MAINTENANCE MANUAL AND AS-BUILT DRAWINGS




Prior to the issue of the Certificate of Practical Completion for the building, the Contractor shall provide:

(A) Two (2) sets of Maintenance Manuals which should include:

(1) Details of the cleaning agents for walls and floor.

(2) Maintenance procedures for walls and floors.

(3) Recommended procedures for replacement of stone panels for dry fixed panel

(B) Two (2) Copies of as-built drawings of the stone work installed. These drawings shall be correct in all respects and fully dimensioned. After these drawings have been prepared but before they are issued to the Owner, the Contractor shall submit two (2) copies of the drawings to the Architect for his approval. The Contractor shall make all amendments the Architect may deem necessary before submitting the drawings to the Owner.

* * *


gs_4_mason_stone_cladding_work.doc

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