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Waterproofing for Wet Areas (hobless showers)




  • All surfaces to be waterproofed must be firm, clean, dry, sound and smooth. All grease, oil, wax, curing compounds, loose material, paint and any other contaminants must be removed, masonry surfaces must be pointed flush and surface defects repaired. New concrete must be cured for minimum 28 days.

  • External corners to be waterproofed must be bevelled to ensure a smooth transition of membrane from vertical to horizontal surfaces.


  • Installation shall be in accordance with AS 3740-2010 Waterproofing of domestic wet areas. Tile installation shall be in accordance with AS 3958.1-2007 Ceramic tiles - Guide to the installation of ceramic tiles.

  • Install a puddle flange to all waste pipes ensuring that puddle flanges are recessed into substrate.

  • Install Aluminium Angle to perimeter of shower and at door opening (if required).

  • Install Bond Breaker to all internal corners vertically and horizontally using Admil SupaSeal PU. Admil SupaSeal PU is a Low Modulus, Hybrid Polyurethane, flexible joint sealant and adhesive that is free of Isocyanates and other hazardous raw materials and omits low odour.

  • Apply WPA 160 Primer to all non-porous surfaces such as puddle flange and Waterstop angle. WPA 160 is a specialised solvent free primer designed for enhancing the adhesion of subsequent membranes, adhesives, toppings and decorative finishes over porous or non-porous substrates.

  • Apply WPA 360 or WPA 460 Primer to substrate to be waterproofed. WPA 360 is a water based low solids, fast drying primer for use with WPA500 or WPA230 UV waterproofing membranes. WPA460 is a two component water based epoxy primer used to seal concrete and masonry surfaces.

  • Apply a minimum of two coats of WPA 500 or WPA 230 UV or WPA Rapid membrane to achieve the required dry film thickness. Ensure that the previous coat has completely dried before applying the subsequent coat(s). NOTE: All penetrations, such as screws and taps must be waterproofed. WPA 500 is a waterborne, fibre reinforced, flexible waterproof membrane designed for use under tile finishes.  WPA 230 UV is an elastomeric, one part, fibre reinforced, UV stable, water based polyurethane membrane  

  • WPA Rapid is a fast curing, waterborne flexible waterproof membrane designed for use under tile finishes.

  • Install CTA Eco Screed with Efflock to shower base (and bathroom floor if required), ensuring a minimum of 1 : 80 fall to waste in shower area. CTA ECO SCREED is a pre blended screed underlayment consisting of graded sand, cement and additives.  EFFLOCK is a high performance, solvent free, water based liquid additive, ideal for the bulk impregnation of cementitious building materials.

  • Install Floor tiles using CTA Pro Premium or CTA Promaxset. PROHESIVE PRO PREMIUM is a premium quality, extremely high strength, polymer modified, cement based adhesive. PROHESIVE PPROMAXSET is a high strength, polymer modified, flexible cement based adhesive, which has been specially developed for installing most types of tiles.

  • Install Wall tiles using CTA Pro Premium or CTA Promaxset.

  • Grout tiles using the appropriate colour of Polyblend Grout. POLYBLEND grout is a premium high quality polymer modified, flexible, cement based, coloured grout designed for grouting most types of tiles including ceramic, porcelain, natural stone and glass mosaics.

  • Install sanitary Silicone to all perimeter and intermediate movement joints.