02 roofing and waterproofing

Archetype Vietnam Ltd Saigon Pearl development project - phase 2a SECTION 02 : ROOFING AND WATERPROOFING GENERALLY 1.1 SCOPE 1.2 STANDARDS AND CODES OF PRACTICE 1.3 SUBMISSIONS 1.3.1 SUBMISSION GENERALLY 1.3.2 DATA SUBMISSIONS 1.3.3 SHOP DRAWINGS 1.3.4 CONTRACTOR’S DOCUMENTS 1.3.5 SAMPLES 1.4 QUALITY 1.4.1 QUALITY ASSURANCE - QUALITY CONTROL 1.4.2 INSPECTION 1.5 APPROVED SUBCONTRACTOR 1.6 GUARANTEE .6 PROPRIETARY ROOFING SYSTEM 2.1 APPROVED SPECIALIST CONTRACTOR 2.2 PREPARATION SPECIALIST CONTRACTOR 2.3 ROOF VENTS COVERINGS AND FLASHING 3.1 MATERIALS 3.1.1 LEAD 3.1.2 COPPER 3.1.3 ALUMINUM 3.2 WORKMANSHIP 3.2.1 LEAD 3.2.2 COPPER 3.2.3 ALUMINUM 3.2.4 CONTACT OF DISSIMILAR METALS BITUMEN FELT BUILT-UP ROOFING 4.1 MATERIALS 4.1.1 BITUMEN FELT 4.1.2 BITUMEN PRIMER 4.1.3 BONDING COMPOUND 4.1.4 DRESSING COMPOUND 4.1.5 STONE CHIPPINGS 4.1.6 NAILS 4.2 WORKMANSHIP 4.2.1 GENERALLY 4.2.2 NUMBER OF LAYERS 4.2.3 LAPS 4.2.4 BONDING COMPOUND 4.2.5 PREPARATION OF BASE 4.2.6 SETTING OUT 4.2.7 LAYING 4.2.8 SURFACE DRESSING 4.2.9 SKIRTING 4.2.10 VERGES 4.2.11 OUTLETS 4.2.12 PIPES, AERIALS ETC THROUGH ROOF BITUMINOUS EMULSION ROOFING 5.1 MATERIALS 5.1.1 BITUMINOUS EMULSION 5.1.2 GLASS FIBER MEMBRANE 5.2 WORKMANSHIP 5.2.1 PREPARATION OF BASE 5.2.2 APPLICATION OF BITUMINOUS EMULSION 5.2.3 WASH COAT 10 5.2.4 PRIMING COAT 10 5.2.5 LAYING GLASS FIBER MEMBRANE 10 5.2.6 CONCRETE FLAT ROOFS 10 5.2.7 EXISTING FELT ROOFS 10 5.2.8 WATERPROOFING JOINTS TO STEEL SHEET ROOFING 10 5.2.9 SURFACE FINISH 10 CHINESE TILE ROOFING 10 Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 1/19 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a 6.1 MATERIALS .11 6.1.1 TILES 11 6.1.2 APPROVAL OF TILES 11 6.1.3 MORTAR .11 6.1.4 NAILS 11 6.1.5 SPECIAL TILES 11 6.2 WORKMANSHIP 11 6.2.1 TYPE OF TILING 11 6.2.2 NUMBER OF TILES 11 6.2.3 BEDDING .11 6.2.4 VERGES 11 6.2.5 RIDGES, HIPS AND VALLEYS 12 6.2.6 EAVES 12 6.2.7 ABUTMENTS, ETC 12 6.2.8 SPECIAL TILES 12 STEEL SHEET ROOFING AND CLADDING 12 7.1 MATERIALS .12 7.1.1 PROFILED SHEETS 12 7.1.2 ACCESSORIES 12 7.1.3 FIXINGS 12 7.2 WORKMANSHP 12 7.2.1 GENERALLY 12 7.2.2 PREPARING SHEETS 13 7.2.3 LAPS 13 7.2.4 FIXING SHEETING 13 7.2.5 FIXING ACCESSORIES 13 7.2.6 MOVEMENT JOINTS 13 7.2.7 COLORED COATED STEEL SHEETS 13 7.2.8 SHEETS TO CURVED ROOFS 13 ALUMINUM SHEET ROOFING AND CLADDING 13 8.1 MATERIALS .13 8.1.1 PROFILED ALUMINUM SHEETS 13 8.1.2 ACCESSORIES FOR PROFILED ALUMINUM SHEETS 13 8.1.3 FIXINGS 13 8.2 WORKMANSHIP 14 8.2.1 GENERALLY 14 8.2.2 COMPATIBILITY 14 WATERPROOFING AND TANKING 14 9.1 SCOPE OF WORK 14 9.2 APPROVED SUBCONTRACTOR 14 9.3 MATERIALS .14 9.3.1 ALTERNATIVE MATERIALS 14 9.3.2 STANDARD 14 9.3.3 FLEXIBLE SHEET MEMBRANES 15 9.3.4 COLD APPLIED MEMBRANES 16 9.4 SURFACE PREPARATION 16 9.5 DELIVERY AND SITE HANDLING 16 9.6 NON-DESTRUCTIVE TEST 17 9.7 GUARANTEE 17 9.8 WORKMANSHIP FOR TANKING AND WATERPROOFING 17 9.9 APPLYING OF MEMBRANE WATERPROOFING 18 9.10 PROTECTION OF TANKING 18 Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 2/19 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a GENERALLY 1.1 SCOPE a) Specified in this section: Roofing systems generally, Roof waterproofing generally Refer to the Waterproofing Works Specification for particulars of the waterproofing systems b) Related sections: Section 03: Waterproofing works Section 04: Paving, plastering and tiling Section 05: Roof insulation c) Specified in other sections: Glass Canopies: Section 8: Aluminum windows, glass wall, cladding 1.2 STANDARDS AND CODES OF PRACTICE a) Unless otherwise specified, all works under the present section shall be executed in accordance with the requirements and recommendations of the appropriate British Standards and Codes of Practice, together with all amendments, that are current at the date of the tender, for materials and workmanship 1.3 1.3.1 SUBMISSIONS Submission generally a) Manufacturers catalogues, test certificate, installation method, material samples and shop drawings, sample panels and prototypes for all relevant materials and equipments shall be submitted to the Construction Manager for review or approval b) The extent of information or samples required shall be adequate and sufficient to demonstrate that the proposed system end materials are in compliance with the contract requirements However, the Construction Manager can request the contractor to submit any additional or supplementary information to substantiate the performance of the proposed system or material c) All submissions are to be made in English language d) Documents larger than A3 size shall be submitted in copies e) No bulk materials and systems ordering work shall proceed prior to the Construction Manager’s confirmation of no adverse comment on the submitted information, samples, sample panels or prototypes It is the contractors sole responsibility to ensure that the required materials or systems can be ordered according to the contractor’s master program f) Where the Construction Manager requires prototypes to be submitted by the Contractor, the Contractor shall be solely responsible for the consequences of delay resulting from failure to allow adequate time for the assessment and approval of submissions, or from the rejection of submissions which not comply with the Contract documents g) No claim for any additional time or cost due to any delayed submission of a satisfactory system will be entertained Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 3/19 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a h) The time required for examination of each submission shall be fifteen (15) working days 1.3.2 Data submissions a) Before any bulk materials and systems ordering work commences, obtain and submit in writing statements from all suppliers, giving the following unless otherwise required by the Construction Manager: Particulars of the supplier's experience in the required type of work Production capacity for material of the required type, sizes and quantity Material source of supply Lead times for delivery of the material to the site Technical specifications, Standard drawings and details, Recommendations for installation, Test reports certified by an independent testing authority showing compliance with the criteria of the specified tests / with this specification, Instructions for operation, care and maintenance, 10 Material safety data sheets (MSDS) showing the health and safety precautions to be taken during application 1.3.3 Shop drawings a) Where shop drawings are required by this Contract to be supplied by the Contractor, such shop drawings shall include drawings, diagrams, illustration, schedules, performance charts, and other data prepared by the sub-contractor, supplier or distributor illustrating some portion of the work b) Supply shop drawings showing the relevant details of each assembly, component and connection, together with information relative to fabrication, surface treatment and erection, including the following: c) Shop drawings submitted without Contractor’s stamp of approval and certification, and shop drawings which, in the Construction Manager opinion are incomplete, contain numerous errors or have not been checked or only checked superficially, will be returned unchecked by the Construction Manager for resubmission d) Drawings rejected by the Construction Manager shall be corrected and resubmitted before fabrication and shall not constitute a claim for extension of time or extra cost e) Shop drawings shall be submitted suitably identified and in orderly sequence to cause no delay to the works Drawings submitted shall correspond to the size of the contract drawings where practicable f) Do not commence fabrication until permission to use the relevant shop drawings has been obtained 1.3.4 Contractor’s documents a) Before works commences, obtain and submit in writing statements from the supplier or suppliers, giving the following, where applicable: Approval of installer: If the installation is not by the manufacturer, and if the manufacturer's guarantee is conditional on his approval of the installer, the manufacturer's written approval of the specialist installing firm including a statement that the proposed installer is experienced in the required type of work Acceptance of substrate: The installing firm's written statement certifying that the building structure/substrate is satisfactory for receiving the installation 1.3.5 Samples a) Before any bulk materials and systems ordering work commences, submit not less than three samples of the following: All materials and products used in the works Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 4/19 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a b) Sample Sizes: Sheet products: minimum 0.25 m2 (500x500mm) per sample Linear products: minimum 1000mm long Granular or liquid products: minimum 0.5 L c) Label each sample for identification, giving the brand name and product name, manufacturer's code reference, date of manufacture, and the like d) Items used in the works shall be in accordance with an approved sample, or within a range defined by approved samples, as determined by the Construction Manager, otherwise such items shall be liable to rejection e) Keep approved samples in good condition on the site until Practical Completion 1.4 QUALITY 1.4.1 Quality assurance - quality control a) During the construction phase, the Contractor shall provide a written certification to the Construction Manager that they have completed a quality assurance check on the specifications and drawings b) Before commencement of the works, submit to the Construction Manager for approval a written description of each quality management system, with specific reference to the following: the relevant standard; where the standard provides for classification levels, the level adopted; the scope and field of application; the personnel involved and their responsibilities; Inspection Test Plans (ITPs) the various procedures required by the standard including those for management review, contract review, design and document control, process control, inspection and testing, etc.; other relevant information 1.4.2 Inspection a) Give sufficient notice to the Construction manager so that inspection may be made of the works at the following times: Following preparation of the substrate and prior to application of the membrane Following application of the primer (if any) and prior to application of any subsequent coats / layers Following application of each coat / layer of membrane material and prior to application of the subsequent layer At the completion of all flashings, cappings etc and prior to the installation of ballast, paving, tiling, etc At the completion of the membrane and prior to the test At the completion of flood test prior to removing water Parts of the roofing, and roof plumbing installation which will be covered up or concealed b) Where works are to be carried out in stage or progressively throughout the project have the above inspections for each stage or area c) Minimum notice required: working days 1.5 APPROVED SUBCONTRACTOR a) Unless otherwise specified, works under this section shall be carried out by a sub-contractor selected and approved by the Construction Manager Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 5/19 Archetype Vietnam Ltd 1.6 Saigon Pearl development project - phase 2a GUARANTEE a) Unless otherwise specified, the Contractor is to submit to the Client a guarantee jointly signed by the Contractor and the specialist contractor that all roofing and waterproofing works under this section including finishing and screeding will remain free from defects and watertight for a period of not less than ten (10) years after the issuance of the Certificate of Completion making good defects by the Construction Manager The guarantee is to tie in a form approved by the Construction Manager and shall include guarantee against leakage caused by structural movement and works not in this contract which affect the roofing and waterproofing PROPRIETARY ROOFING SYSTEM 2.1 APPROVED SPECIALIST CONTRACTOR a) Proprietary membrane roofing system when specified (Refer to Particular Specification) shall be laid and executed by a specialist contractor selected and approved by the Construction Manager b) The Contractor shall request the specialist contractor in writing to provide a list of any and all conditions which will affect the satisfactory execution of his work or its permanence c) The Contractor shall notify the specialist contractor that his commencement of application of roofing works shall constitute his acceptance that the surface prepared by the Contractor is in proper condition d) After such acceptance, the specialist contractor (as between himself and the Contractor and through his guarantee to the Client) shall be liable for correcting all work and materials which produce an unsatisfactory installation of roofing e) The Contractor shall prohibit the roofing contractor to start work until all work by other trades which is liable to penetrate the roofing has been completed 2.2 PREPARATION SPECIALIST CONTRACTOR a) The Contractor shall check with the specialist contractor the precise requirements for the finish to the base prior to laying Ensure that the base is clean and dry and acceptable to the specialist contractor before the roofing work start 2.3 ROOF VENTS a) When specified position and fix approved proprietary roof vents in accordance with the manufacturer’s recommendations and ensure that the specialist contractor makes good his roof covering up to and around them COVERINGS AND FLASHING 3.1 MATERIALS 3.1.1 Lead Sheet lead to be to BS 1178, 1.8mm thick Code No.4, Color Blue 3.1.2 Copper Sheet copper to be to BS 2870 3.1.3 Aluminum Sheet aluminum to be to BS 1470 and as specified Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 6/19 Archetype Vietnam Ltd 3.2 Saigon Pearl development project - phase 2a WORKMANSHIP 3.2.1 Lead a) Fix sheet lead in accordance with BS 6915 b) Flashing to be let into walls a minimum of 25mm, secured with lead wedges and pointed in cement mortar Flashing to be lapped a minimum of 100mm and the lower edge secured with lead tacks at 750mm centers 3.2.2 Copper Fix sheet copper in accordance with CP 143 Pt 12 3.2.3 Aluminum a) Fix sheet aluminum in accordance with CP 143 Pt 15 b) Flashings to be let into walls a minimum of 25mm, provided with a turn back, secured with folded aluminum wedges and pointed in cement mortar Flashing to be lapped and single lock welted and lower edge folded under for additional stiffness c) Aluminum in contact with mortar to be coated with bituminous paint after bending 3.2.4 Contact of dissimilar metals Avoid contact in the completed work between the following metals: Aluminum alloys and copper alloys, nickel, lead or stainless steel Iron or steel and copper alloys Zinc (including galvanizing) and copper alloys or nickel Where unavoidable coat contact surfaces with bituminous paint, protective tape or other approved means BITUMEN FELT BUILT-UP ROOFING 4.1 MATERIALS 4.1.1 Bitumen felt Bitumen felt to be BS 747, and as follows: a) Underlayer to consist of one or more layers, as specified, of fine granule surfaced felt Type 1B, (nominal weight 1.8 or 2.5kg/m2) (b) Top layer to be one of the following: Mineral surfaced felt Type 3E, (nominal weight 2,5kg/m2) Fine granule surfaced felt Type 1B, (nominal weight 15kg/m2) Rolls to be delivered to site hearing the trade mark and certification as to the BS type 4.1.2 Bitumen primer Bitumen primer to be selected to suit the type of bonding compound 4.1.3 Bonding compound Bonding compound to be an Approved brand 4.1.4 Dressing compound Bitumen dressing compound to be cut-back bitumen to BS 3690, grade 50 secs Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 7/19 Archetype Vietnam Ltd 4.1.5 Saigon Pearl development project - phase 2a Stone chippings Stone chippings to be light colored, hard and free from brown or partially decomposed stone Chippings to be graded from to mm 4.1.6 Nails Nails for fixing felt to be galvanized steel or non ferrous metal extra large head clout or felt nails 20 mm long, to BS 1202, Pt 4.2 WORKMANSHIP 4.2.1 Generally Lay bitumen felt roofing generally to CP 144, Pt.3 4.2.2 Number of layers Unless otherwise specified provide the following number of layers: Roofs of permanent building - two underlayers, one top layer, and a surface dressing Roofs of temporary building - one underlayer, one top layer, and a surface dressing 4.2.3 Laps Lap felt 75mm at joints and 100 mm at ends of length Lap successive layers to break joints 4.2.4 Bonding compound Provide thermometer and not heat to more than 220 °C Lay evenly at a sufficiently high temperature to obtain a satisfactory bond (normally 180 to 200 °C) 4.2.5 Preparation of base Before starting work, ensure that the base is clean and dry 4.2.6 Setting out a) Flat roofs - lay the first layer of felt starting at and parallel to the lower edge or eaves Lay subsequent layers in a similar manner to ensure that the lap in the built up roofing does not obstruct the flow of water b) Sloping roofs - lay the felt in the direction of the slope Lap sheets with the exposed laps away from the direction of the prevailing wind 4.2.7 Laying a) Concrete Roofs: Brush on a cost of bitumen primer, and allow to dry Partially bond the first layer to the base at perimeter and in spots or strips, with hot bonding compound at the rate of 0.5 kg/m2 Roil with a 70 kg (minimum) roller while the bonding compound is still hot Remove any surplus compound squeezed out at the edge, Fully bond subsequent layers with a continuous even coating of hot bonding compound applied to previous layers at the rate 1.5 kg/m2 Roll and remove any surplus compound as specified above b) Timber roofs: Nail the first layer at 50 mm centers along the laps, 20 mm in from the edges Secure subsequent layers by full bonding as specified hi (a), 4.2.8 Surface dressing Dress surface with bitumen compound applied at the rate of kg/m2 dress immediately with stone chipping lightly rolled in at the rate of 15 kg/m2 Remove any loose chippings Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 8/19 Archetype Vietnam Ltd 4.2.9 Saigon Pearl development project - phase 2a Skirting Provide skirting as follows: To concrete roofs: provide a triangular internal angle fillet at bottom 75 mm wide on splay Carry up underlayers of felt to form skirting 150 mm (minimum) high above roof level Cover with a mineral fell flashing (Type 3E) with one edge tucked into 25 mm groove in wall, wedge at 600 mm centers and pointed with mastic and seal to face of skirting with bonding compound To timber roofs provide a 200 mm timber upstand with angle fillet at bottom fixed secured to roof deck and carry up roofing felt over it Provide a lead apron flashing over 4.2.10 Verges At verges, gutters and the like: Provide and fix a non-ferrous trim fixed with compatible screws or nails bonded between layers of build up roofing to form drip or dressed into gutter Form a welled drip 4.2.11 Outlets All falls and currents are to be directed towards roof outlets Dress all layers into proprietary roof outlets and seal with bonding compound Provide and fix 1.8 mm lead slate size 450mm x 450mm perforated for and with 150mm long outlet soldered on to suit the bore of the pipe and dress between layers of built up roofing 4.2.12 Pipes, aerials etc Through roof Cut and fit roofing around pipes etc passing through roof, dress flange or collar between second and third layers, and seal in hot bonding compound, using: Lead slate size 450mm x 450mm perforated for and with 150mm high collar soldered on to suit bore of pipe Proprietary molded plastic or rubber collar BITUMINOUS EMULSION ROOFING 5.1 MATERIALS 5.1.1 Bituminous emulsion Bituminous emulsion for roofing to be FLINTKOTE or other similar approved Use in accordance with the manufacturer’s recommendations 5.1.2 Glass fiber membrane Glass fiber membrane to be a woven material with a thread count of x per 10mm square (minimum) 5.2 WORKMANSHIP 5.2.1 Preparation of base Before starting work, ensure that the base is clean and dry Wire brush rust patches on steel sheet roofing 5.2.2 Application of bituminous emulsion Apply coats of bituminous emulsion evenly by brush Ensure that last coat is dry before applying the next coat Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 9/19 Archetype Vietnam Ltd 5.2.3 Saigon Pearl development project - phase 2a Wash coat Wash coat to be of “Bitumen Emulsion No 3” or equal approved and water 1:1 by volume 5.2.4 Priming coat Priming coat to be of “Bitumen Emulsion No, 3” or equal approved and water 5:1 by volume 5.2.5 Laying glass fiber membrane Lap glass fiber membrane 75mm at joints Press into last coat of emulsion while still wet 5.2.6 Concrete flat roofs Treat concrete flat roofs as follows: Apply wash coat and priming coat Apply one coat of “Bitumen Emulsion No 3” or equal approved at the rate of 0,7 liter/m2 Apply one layer of glass fiber membrane Apply three coats of “Bitumen Emulsion No 3” or equal approved at the rate of 0.5 liter/m2 per coat 5.2.7 Existing felt roofs a) Treat existing felt roofs as follows: Cut out cracks exceeding mm wide or where ordered Apply wash coat and primer’ to grooves Fill grooves with compound consisting of “Bitumen Emulsion No 3” or equal approved and sand 1:3 by volume b) After making good cracks, treat the entire roof area as follows: Apply Shell “PF4 Solution” or equal Approved at the rate of 0.2 liter/m2 Apply two costs of “Bitumen Emulsion No 5” or equal approved at the rate of 0.7 liter/m2 per coat 5.2.8 Waterproofing joints to steel sheet roofing Treat joints of steel sheet roofing, in a strip 150 mm wide to cover the joint, as follows: 5.2.9 Point joint with “Bitumen Emulsion No 7” or equal approved Apply “F4 Solution” or equal Approved at the rate 0.14 liter/m2 Apply “Bitumen Emulsion No 3” or equal approved at the rate of 0.7 liter/m2 Apply one layer of glass fiber membrane Apply two coats of “Bitumen Emulsion No 3” or equal approved at rate of 0.7 liter/m2 per coat Surface finish Surface finish to be of: A dressing of clean, sharp sand, or Two coats of ALUBIT or equal approved bituminous aluminum paint at the rate of 0.11 liter/m2 per coat, or Two coats of DECORALT or equal Approved colored finish at the rate of 0.16 liter/m2 per coat, or One coat of compound consisting of cement, “Bitumen Emulsion No 3” or equal Approved and sand 1:8:32 by volume, trowelled on or 5mm thick, as specified CHINESE TILE ROOFING Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 10/19 Archetype Vietnam Ltd 6.1 Saigon Pearl development project - phase 2a MATERIALS 6.1.1 Tiles a) Tiles to be red or any color or otherwise specified in color, sound, well-burnt, whole and free from cracks and blemishes b) Approximate sizes to be: Plain Tiles 225 x 225 mm Roll Tiles 165mm long and tapered Valley Tiles 300 x 225mm 6.1.2 Approval of tiles A sample of the tiles to be Approved before ordering 6.1.3 Mortar Mortar to be: Cement mortar or cement/lime mortar, as specified in the Brickwork and blockwork Section, Chunam mortar as specified in specification 6.1.4 Nails Nails to be aluminum or galvanized steel nails at least mm diameter 30 mm long and with plain heads 6.1.5 Special tiles a) Roll tiles to be left exposed are to be specially selected and semicircular in section b) Glazed tiles are to be obtained from an approved manufacturer 6.2 WORKMANSHIP 6.2.1 Type of tiling Lay local “dragon scale” tiles or approved equivalent on roofs as follows: A single layer of plain tiles to the gauge specified with roll tiles to 120mm gauge A double layer, each layer as (a) above 6.2.2 Number of tiles The minimum number of plain and roll tiles used per 10 square meters of roof tiling to be as follows: Layer type Single layer tiles Double Layer Tiling 6.2.3 Plain Tiles 115 mm gauge 338 766 75 mm gauge 572 1146 Roll tiles 382 764 Bedding a) Bed corners of tiles in mortar slabs Lay roll tiles to lap 50 mm, bed both edges in mortar, and cover with similar mortar 15mm (minimum) thick, trowelled smooth b) On wood battened roofs, drive nails into battens and have projecting 15 mm as key for mortar dabs and neatly point underside if exposed 6.2.4 Verges Finish with a mortar fillet, trowelled smooth Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 11/19 Archetype Vietnam Ltd 6.2.5 Saigon Pearl development project - phase 2a Ridges, hips and valleys Form ridge or hips with rows of inverted tiles, with rows of roll tiles over Form valleys with special tiles Bed in mortar and cover with similar mortar 25 mm thick, trowelled smooth 6.2.6 Eaves a) Single, layer tiling - finish eaves with double course of tiles, where specified b) Double layer tiling - finish eaves with roll tiles or tile slips placed centrally between rolls and fill edge with mortar, trowelled smooth 6.2.7 Abutments, etc Cut and fit tiling at abutments and around pipes, etc and finish with a mortar fillet, trowelled smooth 6.2.8 Special tiles Roll tiles to be left exposed are to be bedded and pointed in cement mortar Glazed tiles are to be fixed in accordance with the manufacturers’ recommendations, STEEL SHEET ROOFING AND CLADDING 7.1 MATERIALS a) Steel corrugated sheets to be hot-dipped galvanized sheet to BS 3083 b) Sheets to be 0.6 mm thick minimum, with corrugations 76 mm wide and 19 mm deep 7.1.1 Profiled sheets Profiled steel sheets to BS 5427 shall be obtained from approved manufacturer of profile, thickness, finish and color as specified 7.1.2 Accessories Form steel sheet accessories from 0.6mm minimum galvanized steel flat sheet or to be proprietary fittings Accessories for color coated sheets to be obtained from the approved manufacturer of the sheets 7.1.3 Fixings a) Hook bolts and nuts, drive screws, washers, self-tapping screws, roofing bolts, nuts and clips, roofing screws and sheeting clips shall be galvanized steel to BS 1494: Pt.1 or electroplanted to BS 3382 and of the size and finishes specified b) Alternatively, recommended specialist fixings from an approved manufacturer of the roofing sheets c) Bolts and screws shall be fitted with large washers compatible with sheets and shall be capable of withstanding up-lift under typhoon conditions d) Where colored roofing sheets are used, fixing head shall be covered with plastic caps to match the color of the sheets e) Rivet fixings may only be used with the permission of the Construction Manager, and then only for vertical flashing 7.2 WORKMANSHP 7.2.1 Generally Fix steel sheeting generally to CP 143, Pt 10 Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 12/19 Archetype Vietnam Ltd 7.2.2 Saigon Pearl development project - phase 2a Preparing sheets Drill or punch holes in the crown of the corrugations for roofing, and in the trough of the corrugations for cladding, Drill holes mm larger than bolts or screws, and not less than 40 mm from edges of sheets 7.2.3 Laps a) Lay sheets with minimum end laps of 150 mm for sloping sheets, and 75 mm for vertical sheets b) All laps to be located over a roofing member c) Lay sheets with slide laps of one and a half corrugations d) Seal side and end laps with approved lap sealant, where specified 7.2.4 Fixing sheeting a) Fix to steelwork with self tapping screw designed for fixing to steel Fix to timber with self tapping screws designed for fixing to timber b) Fixings for two rows around the perimeter of the roof, to any projecting areas, verges or open areas and at all end laps to be at 300 mm (maximum) centers 7.2.5 Fixing accessories Cut, fit and dress steel sheet accessories to fit corrugations Where possible, fix with same fixings as used to secure the sheeting Elsewhere, fix to the sheeting with roofing bolts 7.2.6 Movement joints Provide movement joints in all lengths of roofing of cladding over 45m, with one joint for lengths up to 75 mm and one for every additional 30m Cover with movement joint cover fixed to sheets at one side only 7.2.7 Colored coated steel sheets Fix sheets in accordance with the manufacturer’s recommendations, Sheets to be sheared and not cut with circular saws or abrasive wheels Making good damages as specified 7.2.8 Sheets to curved roofs Sheets required to be bent to a radius for use on curved roofs shall be sent by means of a proper profiling machine ALUMINUM SHEET ROOFING AND CLADDING 8.1 MATERIALS 8.1.1 Profiled aluminum sheets Aluminum corrugated and profiled sheets shall be to BS 4868 Corrugated sheets shall be at least 0.6 mm thick with corrugations 76 mm wide and 19 mm deep Profile sheets shall be of the profile, thickness, finish and color as specified 8.1.2 Accessories for profiled aluminum sheets Accessories for profiled aluminum sheets shall be made from aluminum flat sheet at least 0.6 mm thick and of similar finish and color to the profiled sheets or to be Approved proprietary fittings, Accessories for color coated sheets shall be obtained from the approved manufacturer of the sheets, 8.1.3 Fixings Fixings for aluminum profiled sheets as in “Steel Sheet Roofing and Cladding / Fixing” above Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 13/19 Archetype Vietnam Ltd 8.2 Saigon Pearl development project - phase 2a WORKMANSHIP 8.2.1 Generally Fixing of aluminum sheet shall be similar to that for steel sheeting See “Steel Sheet Roofing and Cladding / Workmanship” above 8.2.2 Compatibility To prevent electro-chemical corrosion, direct contact with other metals (particularly copper) shall be avoided Fixings must be of or compatible with aluminum Where unavoidable coat contact surfaces with bituminous paint, protective tape or other approved means WATERPROOFING AND TANKING 9.1 SCOPE OF WORK a) The works to be carried out under this contract comprise the supply of all materials, equipment and labor required for the implementation of all waterproofing and tanking work specified in this section, the Particular Specification and/or as shown on the Contract Drawings including: Waterproofing against existing and adjoining buildings Basement tanking and waterproofing to retaining walls, lift pits or other substructure details as shown on the drawings Waterproofing to roof tanks, or other superstructure details as shown on the drawings (refer also to Concrete section) b) The description to works given above is only an indication of the extent of the works required and must not be read as the complete Scope of Works forming this contract, the Contractor is deemed to have read the other related documents and in particular the drawings and Waterproofing Works Specification 9.2 APPROVED SUBCONTRACTOR Generally unless otherwise specified, waterproofing and tanking work under this section shall be carried out by a sub-contractor selected and approved by the Construction Manager 9.3 9.3.1 MATERIALS Alternative materials a) The contractor shall supply and fix the materials specified in the Waterproofing Works Specification and/or shown on the drawings, Where the contractor wishes to propose substitutes for the specified materials, he shall so in his tender, proposals to substitute materials made after this date will not be considered b) For substitute materials proposed, and other proprietary systems or materials not specified by the Construction Manager, the contractor shall forward such information as may be requested by the Construction Manager in sufficient time to enable proper evaluation of and comment on the proposed materials and/or design c) The Construction Manager retains the right to reject materials he deems as unfit for his purpose and require the submission of alternatives 9.3.2 Standard a) Generally, materials shall be manufactured to the appropriate British Standard, For high performance membranes and like materials not subject to British Standards these shall have been tested by the awarded a current British Board of Agreement Certificate, or the equivalent European technical approval Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 14/19 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a b) Materials tested to other and equal standards may be acceptable Copies of the relevant test certificates, translated into English and Chinese, should be submitted for approval c) Information submitted to the Construction Manager for approval and comment under subclause “Waterproofing and Tanking / Materials” above, shall include as requested: Manufacturer’s technical literature, including BBA Certificates or other appropriate independent test reports Full details of warranties and guarantees Heat loss, dew point and condensation risk analysis calculations for the roof where the Waterproofing and tanking system is to the Contractor’s design Fire resistance Resistance to wind uplift, resistance to peel and the mechanical strength of joints in single layer systems, before and after artificial ageing of the materials Water tightness of proposed membranes - before and after artificial ageing of the materials Heat resistance, including ring and ball softening temperatures - before and after artificial ageing Low temperature flexibility (cold pliability) - before and after artificial ageing Crack bridging capability, resistance to thermal shock, and fatigue endurance 10 Compatibility between adhesives and other sheets or materials - before and after artificial ageing 11 Puncture and abrasion resistance - before and after artificial ageing 12 Resistance to ultra violet (UV) radiation 13 Resistance to biodegradation, root penetration, fungal growth and pest damage, for waterproof membrane(s) in inverted roof specifications, roof gardens, planters and the like 14 Resistance of the materials to chemical attach - where exposure to industrial pollution, ozone or the like a local problem 15 Resistance of the materials to fuel oil and grease - in areas where fuel oil and grease are likely to come into contact with the materials 16 Resistance of membranes to water and water vapor pressure when the materials are used as a vapor control layer, a vapor check or vapor barrier 17 Where it is intended that the material be used in contact with potable water, its portability 18 Evidence that the materials have been installed and have performed satisfactorily over an extended period (generally not less than 10 years), on similar projects 19 Qualifications and experience of the contractor and his staff supervising and carrying out the work 20 Contractor’s shop drawings, sectional drawings and details for proprietary systems not specified by the Architect Drawings and details should show the proposed methods of waterproofing These are subject to the approval of the Construction Manager who may require amendments and resubmission of drawings before granting approval 9.3.3 Flexible sheet membranes Flexible sheet membranes for waterproofing and tanking shall be proprietary materials selected and approved by the Construction Manager and as follows: a) Membranes shall have the following properties: membranes shall be capable of bridging unanticipated movement and cracks in the structure up to 0.6 mm wide (minimum), without loss of waterproofing capabilities membranes shall be able to resist a force of 110 kN/m2 minimum in a lap shear membranes shall be able to resist a force of 3.3 kN/m2 minimum in lap peel b) Standards for sampling and testing of sheet membrane waterproofing and tanking shall be agreed with the Construction Manager The test results shall comply with the above requirements for performance Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 15/19 Archetype Vietnam Ltd 9.3.4 Saigon Pearl development project - phase 2a Cold applied membranes Cold applied membranes for waterproofing and tanking shall be proprietary materials selected and approved by the Construction Manager and as follows: a) Membranes shall have the following properties: Membranes shall be cold applied, seamless, flexible, polyurethane, elastomeric membrane waterproofing system When cured, the materials form an impervious sheet that has resistance to lateral movement, resistance to shear, penetration of water, and allows expansion and contraction Membranes shall be capable of bridging unanticipated movement and cracks in the structure up to 0.6 mm wide (minimum), without loss of waterproofing capabilities Membranes shall be able to resistant a force of 110 kN/m2 minimum in a lap shear membranes shall be able to resist a force of 3.3 kN/m2 minimum in lap peel b) Standards for sampling and testing of cold applied membrane waterproofing and tanking shall be agreed with the Construction Manager The test results shall comply with the above requirements for performance 9.4 SURFACE PREPARATION a) Prior to the commencement of work, the waterproofing and for tanking contractor together with the Construction Manager shall check and approve the condition of surfaces to be waterproofed Alternatively where the client representative(s) is/are working on the project, certification from the person(s) that all preparatory work has been satisfactorily completed and that surfaces are ready to receive waterproofing must be obtained b) Approval shall not be taken to relieve the contractor of any liability under the contract c) Check that surfaces are frees of voids, spalled areas, loose aggregates and sharp protrusions Concrete surfaces receiving waterproofing to have a steel-trowelled finish, followed by a fine hair-broom or equivalent finish Surfaces must be dry and free of dirt, surface laitance, excessive mould oil or other contaminants prior to application d) Ensure the decks, screeds and the like are laid to correct falls and that all preliminary work including expansion joints, sleeves and collars around pipes, independent and fixed upstands, the fixing of roof outlets at the correct levels, parapets etc is complete e) Chases to be cut or cast in 25 mm deep and 25 mm on face The bottom edge of the chase to be knocked off to leave, a rough splayed face f) Joints between precast concrete units to be taped or grouted to manufacturer’s instructions g) If required, a notice of unsatisfactory condition shall be issued to the Main Contractor who shall remedy the defects identified before waterproofing is carried out h) In additions to the abovementioned preparatory works, prepare and apply the waterproofing strictly in accordance with manufacturer’s recommendations, 9.5 DELIVERY AND SITE HANDLING a) All materials shall be delivered and stored until use in their original packaging The packaging shall bear the manufacturer’s name, the grade and weight of the materials and the standards pertaining thereto, including BBA identification marks and certificate numbers b) Materials should be delivered, stored and handled on site strictly in accordance with manufacturer’s instructions Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 16/19 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a c) Generally, materials to be adequately protected and stored at all times in cool dry well ventilated storage protected against the sun Keep materials away from sources of heat and naked flame Keep containers tightly sealed and not empty primers or other deleterious substances into drains Store rolls on end under cover d) Use protective clothing, gloves and eye protection as necessary when handling molten bitumen and other materials e) Take all necessary fire precautions to minimize the risk of fire or accident The contractor is to cordon off the working area, including around the bitumen boiler, to prevent access by unauthorized persons and shall provide in adequate number and fully charged, dry power, carbon dioxide or foam fire extinguishers and sand to extinguish fires Do not use water to extinguish fires and not allow water to come into contact with hot bitumen f) 9.6 Any materials damaged shall be removed from the site and shall not be incorporated into the work unless expressly permitted by the Construction Manager NON-DESTRUCTIVE TEST a) Test the proprietary waterproof roofing membranes as follows: Seal all roof outlets If necessary, construct temporary dams to subdivide large roof areas Flood roof for 24 hours, After flooding unlock outlets and remove temporary dams Between 24 and 48 hours after release of the test water, an infrared scan is to be carried out by an independent specialist contractor, to establish if there has been leakage through the waterproofing membrane b) The test results shall be forwarded directly from the office of the specialist contractor to the Construction Manager 9.7 GUARANTEE a) For the proprietary waterproof and tanking system, and executed guarantee shall be provided in duplicate by the Main Contractor The guarantee to be executed in the name of the Client and to be submitted to the Construction Manager b) The waterproofing and tanking system shall be guaranteed for use under climatic conditions prevailing in the region and locally at the site for a period of ten (10) years The guarantee shall cover the waterproofing and tanking system in its entirely, including adhesion and the structural integrity of the materials used and workmanship by the contractor c) A guarantee from a sub-contractor, except a sub-contractor nominated by the Client, is acceptable only in addition to a guarantee provided by and on behalf of the Main Contractor 9.8 WORKMANSHIP FOR TANKING AND WATERPROOFING a) Waterproofing and tanking work generally shall be carried out in accordance with BS 8102 Protection of structures against water from the ground, and BS 8000: Pt b) The waterproofing and tanking contractor shall prepare and submit to the Construction Manager for approval fully detailed shop drawings showing the methods of waterproofing Shop drawings shall show details at all corners angles, changes in plane, pipe penetrations, construction joints, etc Details should be fully drawn, dimensioned annotated c) The Construction Manager may require the contractor the amend such details of other waterproofing and resubmit shop drawings as he deems fit d) Work is to be carried out on site in strict accordance with the approved drawings and as follows: Adequate supervision of the works to be provided by either a representative of the contractor or a representative of the manufacturer of the waterproofing and tanking materials used Supervisors should be experienced in all aspects of the work for which Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 17/19 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a they are responsible, A resume detailing the qualifications and work experience of supervisory staff is to be forwarded to the Construction Manager for approval The supervisor shall be responsible for inspecting the works at each stage, from preparation of the substrate to completion, and shall forward his written approval of the work to date at each stage to the Construction Manager e) Formal approval for each stage of the work shall be carried out by the Construction Manager f) Prepare substrates to be tanked as follows: The concrete substrate is to be given sufficient time to properly cure before work commences, and in no case less than days Surfaces to be tanked to be flat and true, free from voids, spalled areas, concrete or mortar droppings, loose aggregates and sharp protrusions such as concrete fins, dips or ridges, Do not use excess mould oil in forms, Surfaces to be tanked with proprietary flexible sheet membranes to be prepared generally as above and in accordance with the Particular Specification and to manufacturer’s recommendations 9.9 APPLYING OF MEMBRANE WATERPROOFING Apply flexible waterproofing membrane in strict compliance recommendations, the Particular Specification and as follows: with manufacturer’s a) Prior to the commencement of work, the contractor shall demonstrate on site that adhesives and materials are fully compatible b) Surfaces shall be prepared to the requirements of the Particular Specification and in strict accordance with the recommendations of the manufacturer of the proprietary materials to be used The contractor shall provide suitable moisture testing equipment on site Tests are to be carried out to determine the moisture content of the substrate and, where applicable, ambient conditions No work is to be carried out where test results exceed manufacturer’s recommendations for application conditions c) Waterproofing/Tanking Membranes are to be laid, lapped and jointed in strict compliance with manufacturer’s instructions Adhesives used are to be spread at the rates recommended by manufacturer, A record is to be maintained of the adhesive used, checked against the specified or recommended spreading rates for the bonding of the membrane Adhesive must not be allowed to set before the placing of the membrane d) Bubbles which form in the membrane shall be made good by the method recommended by the manufacturer The finished membrane is to be fully and uniformly adhered to the substrate, fully sealed along all lap joints and completed watertight 9.10 PROTECTION OF TANKING a) Temporary protection of the exposed lap area at the end of the working day and protection of the membrane until permanent protection provided, to be as recommended by the manufacturer of the waterproofing materials used, b) Permanent protection of vertical tanking shall be provided throughout its height with the erection of masonry skin walls or the installation of approved proprietary protection boards or other method as specified c) Permanent protection of horizontal tanking shall be by a 50 mm thick screed of sand and cement mortar (1:3) or other method as specified Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 18/19 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a Internal tanking and protection walls of concrete blocks shall be thoroughly grouted, course by course, leaving no voids and with an even, tight and protection against the vertical tanking — END OF SECTION — Date: 29.05.06 Revision Tender Specifications - Section 02: Roofing and waterproofing - Page 19/19 [...]... Section 02: Roofing and waterproofing - Page 14/19 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a b) Materials tested to other and equal standards may be acceptable Copies of the relevant test certificates, translated into English and Chinese, should be submitted for approval c) Information submitted to the Construction Manager for approval and comment under subclause Waterproofing and. .. the waterproofing and tanking system in its entirely, including adhesion and the structural integrity of the materials used and workmanship by the contractor c) A guarantee from a sub-contractor, except a sub-contractor nominated by the Client, is acceptable only in addition to a guarantee provided by and on behalf of the Main Contractor 9.8 WORKMANSHIP FOR TANKING AND WATERPROOFING a) Waterproofing and. .. other approved means 9 WATERPROOFING AND TANKING 9.1 SCOPE OF WORK a) The works to be carried out under this contract comprise the supply of all materials, equipment and labor required for the implementation of all waterproofing and tanking work specified in this section, the Particular Specification and/ or as shown on the Contract Drawings including: 1 Waterproofing against existing and adjoining buildings... documents and in particular the drawings and Waterproofing Works Specification 9.2 APPROVED SUBCONTRACTOR Generally unless otherwise specified, waterproofing and tanking work under this section shall be carried out by a sub-contractor selected and approved by the Construction Manager 9.3 9.3.1 MATERIALS Alternative materials a) The contractor shall supply and fix the materials specified in the Waterproofing. .. preparatory works, prepare and apply the waterproofing strictly in accordance with manufacturer’s recommendations, 9.5 DELIVERY AND SITE HANDLING a) All materials shall be delivered and stored until use in their original packaging The packaging shall bear the manufacturer’s name, the grade and weight of the materials and the standards pertaining thereto, including BBA identification marks and certificate numbers... be able to resist a force of 3.3 kN/m2 minimum in lap peel b) Standards for sampling and testing of sheet membrane waterproofing and tanking shall be agreed with the Construction Manager The test results shall comply with the above requirements for performance Date: 29.05.06 Revision 0 Tender Specifications - Section 02: Roofing and waterproofing - Page 15/19 Archetype Vietnam Ltd 9.3.4 Saigon Pearl... thick screed of sand and cement mortar (1:3) or other method as specified Date: 29.05.06 Revision 0 Tender Specifications - Section 02: Roofing and waterproofing - Page 18/19 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a Internal tanking and protection walls of concrete blocks shall be thoroughly grouted, course by course, leaving no voids and with an even, tight and protection against... profiled sheets as in “Steel Sheet Roofing and Cladding / Fixing” above Date: 29.05.06 Revision 0 Tender Specifications - Section 02: Roofing and waterproofing - Page 13/19 Archetype Vietnam Ltd 8.2 Saigon Pearl development project - phase 2a WORKMANSHIP 8.2.1 Generally Fixing of aluminum sheet shall be similar to that for steel sheeting See “Steel Sheet Roofing and Cladding / Workmanship” above 8.2.2... sheet membranes Flexible sheet membranes for waterproofing and tanking shall be proprietary materials selected and approved by the Construction Manager and as follows: a) Membranes shall have the following properties: 1 membranes shall be capable of bridging unanticipated movement and cracks in the structure up to 0.6 mm wide (minimum), without loss of waterproofing capabilities 2 membranes shall be able... battened roofs, drive nails into battens and have projecting 15 mm as key for mortar dabs and neatly point underside if exposed 6.2.4 Verges Finish with a mortar fillet, trowelled smooth Date: 29.05.06 Revision 0 Tender Specifications - Section 02: Roofing and waterproofing - Page 11/19 Archetype Vietnam Ltd 6.2.5 Saigon Pearl development project - phase 2a Ridges, hips and valleys Form ridge or hips with