Pre-applied waterproofing

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1 Construction Specifications Institute DIVISION 7; Thermal & Moisture Protection Below-ground waterproofing 1.01 DESCRIPTION PART 1 - GENERAL A. Provide labour, materials, equipment and services and perform operations required for installation of pre-applied mechanically keyed PE/PP membrane waterproofing system and related work as indicated on the drawings and specification, all in accordance with the requirements of the contract documents. B. Work included but not limited to all concrete surfaces on horizontal and vertical parts of the substructure including pile caps QUALITY ASSURANCE A. The product shall be manufactured from a certified ISO9001 / ISO14001 / OHSAS company. B. The product system shall be BBA independently certified and CE Marked. C. The product system shall have been successfully installed for below-ground waterproofing applications and in use for a minimum of 10 years. D. The waterproofing shall be applied by a specialized applicator of the waterproofing membrane manufacturer, and who has the necessary equipment and skilled labour to carry out the work satisfactorily, subject to approval of the Engineer. E. Substrate condition: Subcontractors representative to approve conditions of substrates prior to the application of waterproofing. Rectify conditions as necessary to obtain sub-contractors representative s approval. F. Inspection: Arrange for the applicator to inspect each completed waterproofing installation area, agreed by the client s representative, before placing of structural concrete, make good any defects as necessary, and provide written report that it complies with manufacturers written instructions. G. Contractor should ensure placement of good quality structural concrete with at least 180mm slump and no honeycombing SUBMITTALS A. Provide manufacturer s printed datasheets / specifications and membrane installation instructions, including methods and materials used for terminations, penetrations and lapping etc B. Provide samples of all materials within the waterproofing system specification WARRANTY A. Provide written warranty for product and installation, valid from date of completion of the works and valid for xx years. The specialist applicator will be responsible for making good any defects due to workmanship.

2 1.05 STORAGE AND HANDLING A. Store materials in dry areas out of direct sunlight and as directed by the product manufacturer. B. Do not use any materials that are damaged due to storage and handling C. Deliver materials in manufacturer s unopened containers clearly identified with name/brand/type/grade etc ENVIRONMENTAL CONDITIONS A. Apply the waterproofing systems within the temperature ranges recommended by the manufacturer. B. Proofex Engage should be covered with the structural steel reinforcement as soon as possible after laying. C. Installed membrane should not be left exposed for more than 6-8 weeks. D. For applications during temperatures in excess of 30 o C and strong direct sunlight, it is recommended to unroll the Proofex Engage and leave loose for at least 30 minutes prior to commencement of installation. It is also necessary to weld along the selvedge using a hot-air gun PROTECTION A. Where self-adhesive membranes are used in conjunction with the pre-applied waterproofing system (i.e. top of foundation scarcements), these membranes shall be protected with Protection Boards supplied by the membrane manufacturer MATERIALS A. PRE-APPLIED PE/PP MEMBRANE PART 2 - PRODUCTS 1. The below-ground waterproofing system shall be based on Fosroc Proofex Engage, a 4mm thick pre-applied PE/PP blended membrane conforming to BS8102:2009 and EN13967:2004. The membrane shall mechanically bond to freshly placed concrete, remaining in place if ground settlement occurs. It shall have a current BBA independent certificate, be both waterproof, resistant to sea water and gasproof and possess the following physical properties: Elongation >120% EN Resistance to tear 720N EN WVT u factor EN1931 Resistance to impact >1.5m EN12691 Crack cycling 5mm for 100 cycles ASTM C1305 Joint strength >220N EN Hydrostatic pressure 7bar (69m) ASTM D5385 Overall thickness 4mm

3 The membrane must be installed in conjunction with the manufacturer s recommended ancillary products. 2. PROOFEX LM & MESH A 2-component trowelable membrane for sealing around penetrations such as pipe entries and pile caps. Applied a minimum of 5mm thick. For areas of extreme loading Proofex LM Mesh reinforcement is bedded into the Proofex LM. 3. PROOFEX L SECTION A 250mm wide strip of polyethylene with 2 butyl selvedge strips. It is used by bending at 90 o along its length for application between horizontal and vertical membrane to provide waterproofing continuity. It is supplied with a butyl closure strip at each roll end, if the L section is cut then the strip must be replaced with Proofex Detail Strip or Proofex Total Tape. 4. PROOFEX ENGAGE DETAIL STRIP A double-sided waterproof adhesive tape for sealing and jointing roll ends, cut edges and corner pieces which is protected by removable siliconised paper. 5. FOSROC POLYUREA WCS GUN GRADE A hand-applied twin cartridge polyurea used to seal between joints in Proofex Engage, roll ends, pile caps, floor/wall junctions etc 6. PROOFEX CORNER PIECES Internal and external pre-fabricated polyethylene corner pieces with butyl selvedge adhesive. 7. PROOFEX TOP HAT Waterproof pipe entry pieces consisting of polyethylene/polypropylene membrane. 8. PROOFEX TOTAL TAPE Used to adhere Proofex Top hats to Proofex Engage for pipe penetrations 9. NITOSEAL MS60 MS polymer sealant to seal between Proofex Top hats and penetration pipe

4 B. SELF-ADHESIVE HDPE MEMBRANE 1. Where a self-adhesive waterproof membrane is require in conjunction with the pre-applied membrane (i.e. top of foundation scarcements), it shall be based on Fosroc Proofex 3000, a 1.5mm thick self-adhesive HDPE membrane conforming to BS8102:2009 and EN13707:2004 and EN13969:2004. It shall have a current BBA independent certificate and possess the following physical properties: Elongation >300% EN Resistance to tear 125N EN WVT 3.433x10-9 kg/m 2 S EN1931 Adhesion to primed concrete 4.9N/mm ASTM D1000 Thickness 1.5mm C. PROTECTION FOR SELF-ADHESIVE MEMBRANE 1. Nominal 3mm thick rot-proof boards suitable for protection for self-adhesive membrane, as recommended by the membrane manufacturer. D. PILE TOP EPOXY GROUT 1. Pile tops shall be made waterproof using either Fosroc Proofex WG or Fosroc Supercast EPT, high strength fast setting epoxy grouts with high chemical resistance, excellent bearing strength and bond to concrete. It shall encapsulate the pile top at 25 mm thickness and seamlessly join to the Fosroc Proofex Engage waterproofing membrane. The top of pile head surface shall be rough to ensure excellent bond of epoxy and concrete. Corner and edge of pile head to be re-profiled by using cementitious grout, Fosroc Supercast PC. The encapsulating resin grout, shall exhibit the following properties: Compressive strength 75N/mm² at 7 days ASTM C 575 method B Tensile strength 11N/mm² at 7 days ASTM C 307 Flexural strength 20N/mm² at 7 days ASTM C 580 method A Water penetration Nil (after 7 days) DIN 1048 Part 5 Rapid chloride permeability Negligible AASHTO T-277 Bond Strength Greater than the tensile strength of the concrete E. WATERSTOPS 1. Basement slab joints shall be constructed with Fosroc Supercast Rearguard R for construction joints and Fosroc Supercast Rearguard S for expansion joints. Wall joints shall be constructed with Fosroc Supercast Watafoil for construction joints and Fosroc Supercast Hydrofoil for expansion joints. Wall kicker and construction joints shall also be constructed with Fosroc Supercast SW30 swellable strip waterstop bedded on Fosroc Supercast SWX adhesive. This must be positioned to give a minimum of 100mm concrete cover.

5 The Supercast PVC waterstops shall exhibit the following properties; Tensile strength at 25oC >14MN/m2 BS2782 Elongation at break at 25oC >300% BS2782 Hydrostatic pressure 25 bar (250m) Width 250mm The swellable strip Supercast SW30 waterstop shall exhibit the following properties; Dimensions 20mm x 10mm Solids content 100% basic polymer type free from bentonite inclusions Unrestained expansion up to 500% Hydrostatic pressure 10bar (100m) Wet / dry cycling consistent performance for 20 wet / dry cycles Watertightness Remains watertight for subsequent joint gaps up to 2mm PART 3 - EXECUTION 3.01 PREPARATION FOR PRE-APPLIED MEMBRANE A. Horizontal application - the Fosroc Proofex Engage membrane shall be applied to a smooth, prepared concrete blinded substrate. Concrete blinding is preferred but a well compacted, sand blinded, granular fill is acceptable as a level sub base. The substrate shall be free from loose aggregate or other sharp protrusions. Standing water must be removed to prevent contamination of overlaps and subsequent compromise of waterproof properties. B. Vertical application - the Fosroc Proofex Engage membrane is applied to temporary or permanent formwork or adjoining structures. All substrates must be smooth and free from loose aggregate or other sharp protrusions INSTALLATION OF PRE-APPLIED MEMBRANE A. Cut the Fosroc Proofex Engage membrane to a convenient length for installation. Carefully align the membrane and roll it out with the ribbed surface uppermost. Lay adjacent sheets accurately so they overlap the previous sheet 80mm along the adhesive selvedge. Remove the release tape and firmly roll the laps. When laying adjacent full rolls there should be a stagger of half a roll length to avoid a build-up of end joints in one area. B. End joints and cut edges - butt join the Fosroc Proofex Engage sheets onto Fosroc Proofex Engage Detail Strip. The top surface of the join to be further sealed with a 2mm x 60mm wide strip of Fosroc Polyurea WCS Gun Grade or 100mm wide strip of Proofex LM. C. Horizontal to vertical joints - Lap Fosroc Proofex Engage onto Fosroc Proofex L section and overseal with a 2mm x 60mm seam of Fosroc Polyurea WCS Gun Grade or a 40mm x 40mm fillet of Proofex LM. D. All overlaps and joints shall be firmly rolled to ensure complete adhesion between layers.

6 E. If cold or damp conditions prevail, the selvedge adhesive, Fosroc Proofex Engage Detail Strip and Fosroc Total Tape may be tackified by gently warming to assist adhesion. F. For optimum performance in hot climates, the membrane can be spot welded along the selvedge using a hot-air welding tool. G. Where the membrane has been applied to removable shuttering it is recommended that a minimum concrete compressive strength of 10 N/mm² is reached before the formwork is stripped. H. Penetrations e.g., pipe entries through Fosroc Proofex Engage, require special attention to detail. Fosroc Proofex Top Hat units used in conjunction with Fosroc Proofex Total Tape and Fosroc Nitoseal MS60 sealant are recommended. I. Backfilling material must be free from sharp objects and debris that could damage the Fosroc Proofex Engage. It shall not contain house bricks, blocks or boulders larger than 50 mm. J. For applications where Fosroc Proofex Engage is laid on top of insulation boards, the roll lengths must be staggered and limited to 10m. All end laps must be sealed using Fosroc Proofex Detail Strip underneath and then a 60mm wide seam seal of Fosroc Polyurea WCS on top of the mesh. The steel reinforcement, or weighted blocks should be laid over the laps the same day as membrane application. K. If in the unlikely event that the Fosroc Proofex Engage membrane has been punctured then remedial action should follow. Identify the defect area, cut and remove defective membrane in a uniform square format, place Fosroc Proofex Detail Strip underneath the Fosroc Proofex Engage adhering half its width and the other half inside the opening. Cut a fresh piece of Fosroc Proofex Engage same dimensions as the opening and press firmly down into the Fosroc Proofex Detail Strip. Finally, seal around the edges with a 40mm wide seam of Fosroc Polyurea WCS INSTALLATION OF PILE TOP WATERPROOFING A. Pile tops and edges shall be re-profiled as appropriate using Fosroc Supercast PC grout. B. Cut the Fosroc Proofex Engage tight around the pile top. C. Create formwork as necessary and mix and pour either Fosroc Proofex WG or Fosroc Supercast EPT to fully encapsulate the pile top and edges at 25 mm thickness and seamlessly join to the Fosroc Proofex Engage waterproofing membrane. D. Adhere a strip of Fosroc Proofex Total Tape or Detail Strip to the Proofex WG / Supercast EPT sides and apply a 2mm x 60mm seam of Fosroc Polyurea WCS Gun Grade all around the circumference of the pile cap, adhering to the tape and flowing into the Engage (minimum 20mm either side), or apply a 40mm x 40mm fillet of Proofex LM INSTALLATION OF WATERSTOPS A. Carefully fix the Fosroc Supercast Rearguard/Hydrofoil waterstops on centre-line of all concrete joints. Ensure wall waterstops are installed and kept in place in a vertical position during concrete placement.

7 B. Fosroc Supercast SW30 must be applied to a smooth substrate free from sharp protrusions and installed into a 10mm thick bed of Fosroc Supercast SWX adhesive TESTING A. Inspection: Arrange for the applicator to inspect each completed waterproofing installation area, agreed by the client s representative, before placing of structural concrete, make good any defects as necessary, and provide written report that it complies with manufacturers written instructions. B. FLOOD TEST: can be carried out for each designated area for leaks, according to recommendations in ASTM D 5957, after completing waterproofing but before overlaying construction is placed. Install temporary containment assemblies, plug or dam drains, and flood with potable water. 1. Flood to an average depth of 64 mm with a minimum depth of 25 mm but not exceeding a depth of 100 mm. 2. Flood each area for 48 hours. 3. After flood testing, repair leaks, repeat flood test, and make further repairs until waterproofing installation is watertight. C. VACUUM BOX TEST: can be carried out at random designated areas to test for leaks at laps. 1. Mark out the vacuum box size on the Proofex Engage and apply a 50mm wide bead of Fosroc Polyurea WCS Gun Grade around the perimeter ensuring it completely flows into the mesh grid creating a sealed edge, a flat putty blade is recommended to ensure a flat surface. 2. Allow Polyurea WCS Gun Grade to dry for 1-2 hours. 3. Apply soap water solution at the lap joints 4. Position the vacuum box on the Polyurea WCS Gun Grade and switch ON, use pressure of circa 4 in Hg for 1 to 2 minutes 5. Check for water bubbles and repair leaks as appropriate C. SMOKE TEST: can be carried out at random designated areas to test for leaks at laps. 1. The installed Proofex Engage membrane area can be checked with a smoke test method to identify and rectify any weak points in the Proofex Engage membrane installation. 2. Prior to the smoke testing, the Proofex Engage installation shall be visually checked for any apparent deficiencies, especially around the end laps, side laps and penetrations. Rectify any deficiencies in accordance with the standard method statement. 3. Carry out the smoke test by an approved applicator and as witnessed by a designated inspector of the project. The date, time, ambient temperature and testing area shall be recorded in the smoke test record documents. 4. The testing area shall be approximately 100 to 400m 2 for each testing bay, dependent on site configurations. The smoke test must be carried out in good dry weather conditions with no rain or any potential water ponding condition which would cause electrical hazards. The smoke oil for generating smoke must be non-toxic and the MSDS shall be submitted to the safety officer on site before proceeding.

8 5. Set up the smoke testing equipment with a hose penetrating through the Proofex Engage membrane, such that smoke will be injected beneath the membrane. The puncture in the membrane around the hose shall be sealed with Polyurea WCS. 6. Mark testing control points on the membrane to check the extent of smoke coverage in the testing area, and to test the proper functioning of the smoke equipment. The designated control points shall be cut open in an X pattern of minimum 50mm x 50mm. Mark out the control points clearly with bold coloured marker pen. 7. Activate the smoke generator and blower system (approx 200 to 950 cfm), apply sufficient pressure to ensure the smoke will cover the designated testing area. Verify by ensuring that smoke leaks through the control points. Pump the smoke for a minimum of one minute. 8. Check for any smoke leaks in the Proofex Engage membrane in the designated testing area. Mark the leak locations on the tested area and also on the floor plan. 9. Repair the leak locations in accordance with the Proofex Engage standard method statement. 10. Repeat Steps 7 to 8 until no further leak points are identified. The successfull tested area shall be documented and signed off by a qualified site inspector as agreed by the engineer, contractor or client. END OF SECTION