METHOD STATEMENT 003 SCYRON-CEMENT SHEETING BALCONY WATERPROOFING FOR DIRECT FIXED TILES

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1 This Document is designed to cover best practice installation methods for the installation of a class 2/3 waterproof membrane system to external Scyron-cement sheet balconies to AS PRELIMINARY WORK Ensure that all surface preparation work, including falls, levels, is complete and properly constructed to enable the membrane system to work as recommended and intended. Prepare surfaces, including vacuum cleaning and or diamond grinding as necessary to leave the surface smooth, clean, dry and free of all debris. ACCEPTANACE OF SUBSTRATE Confirm and ensure that the substrate complies with relevant substrate standards for Waterproof membrane Systems, including 1:100 falls, Drip or balcony edge angles, and window and door set-downs to be a minimum of 50 mm. Ensure that the substrate is structurally sound and has been installed correctly with the correct side facing up and the balcony is structurally sound against movement and deflection with sheet gaps are locked into place as designed. SURFACE TEMPURATURES Do not install any liquid applied membranes to substrates where the surface temperature is increasing or between 10 c or above 35 c. All Envirotech waterproofing solutions, systems installed in hot or cold substrates will obviously present problems due to accelerated and decelerated cure times. When and where possible, all membrane installations should be scheduled when temperatures are decreasing this can be early morning or late afternoons. The issue with Fibre-cement sheeting is the joins, joints and balustrading supports. These fields involve a complete attention to detail from the installer to make sure these fields are detailed with appropriate bond breaking tapes or bandage system. This is the key to the waterproofing system's durability for the next years. My opinion is that a sheet membrane system is the most durable and safest system for cement sheeting balconies.

2 SURFACE PREPARATIONS Surface preparation is the most vital aspect of installing any waterproofing membranes and coating. Scyon board has been known to be insecure for waterproofing contractors, and must be prepared correctly if the membrane system is going to adhere and perform. When the substrate has been inspected for the above criteria, it is then possible to prescribe the correct preparation and primers to complete the installation of the membrane system. PREPARATION METHODS Bevel by grinding all perimeter edges by mechanical means to get rid of sharp edges Make sure all screw heads are counter sunk below sheet surface. Insert perimeter drip angle or balcony edge if required to make sure to leave no lipping to balcony surfaces. To clean areas Vacuum PRIMING APPLICATION Prime substrates thoroughly by brush or roller with the appropriate primer as follows: Solvent primer to all surfaces. Two-part Epoxy primers or Gripset OP The plastic needs to be primed with acetone or similar

3 Aluminum needs to be primed with Acetone or similar All Primers shall be left to cure as per recommended data sheets. Where an existing coating is present or the substrate is different, confirm with Envirotech on the appropriate primer to be used. FLOOR SHEET JOINTS Make sure all sheet joints are joint sealed with MS sealant and tooled off smooth. Install Gripset/Mapei rubber bandage or Crommelin bond breaker tape continuously to all sheet joints incorporating the waterproofing membrane system. DOOR/WINDOW STEP DOWNS Mechanical round all external sheet edges for membrane system. Install MS flexible sealant 12 mm wide to all junctions and tool off smooth. Reinforce with a polyester mat all set downs to a DFT of 1.2 mm making sure membrane system has been installed 200 mm onto balcony floor areas. PERIMETER UPTURNS Install an MS sealant 12 mm cove, to all junctions and tool off smooth. Reinforce with A polyester mat to all upturns to a DFT of 1.2 mm 100 mm above the finished floor height or 25 mm above water line. Make sure membrane system has been installed 200 mm onto to balcony floor areas.

4 MEMBRANE INSTALLATION Apply one coat of water-based membrane to floor areas, rolling sideways to the drainage outlets. Allow a minimum 24 hours drying at a temperature of 25 longer in colder temperatures. Apply a second coat of waterproof membrane, rolling in a straight line to drainage outlets. DFT shall be 1.5 mm, or a third coat shall be applied after 24 hours curing at a temperature of 25 FIBRE SHEET POST DETAIL Make sure there is a suitable gap between the sheeting and the penetration, a minimum of 5 mm is preferred Install closed cell backer rod to a depth of 6 mm then cove around penetration with MS sealant and tool off smooth. (A 12mm cove is preferred) Reinforce with a polyester mat all upturns to a DFT of 1.2 mm 100 mm above the finished floor height or 25 mm above water line. Make sure the membrane system has been installed 200 mm onto balcony floor areas. MOST FIBRE-CEMENT SHEETING BALCONIES LEAK FROM AROUND PENETRATIONS DUE TO MOVEMENT OR INCORRECT DETAILING. TILE FIXING Tile adhesives should be compatible with the membrane system installed. TILE JOINTS Shall be to James Hardy recommendations and to AS

5 COMPLETION Take a dated picture by camera, and store in folder. Clean up all empty buckets and materials and remove. Leave all work in a sound a condition and defect free. Do it Once-Do it Right-Fixed for Good Reference Contacts and Data: Technical data, advice or technical assistance may be obtained by contacting Enviro-Tech Waterproofing Solutions at:- Web Page john@envirotech.net.au Office Telephone: (07) Office Fax: (07) John Blasé Mobile: Postal address: Unit 254 Robinson Road East Geebung Qld 4034 Australia