Home » Systems » Systems for Waterproofing » Waterproofing Cracks and Control Joints

 

Waterproofing Cracks and Control Joints

https://www.bayset.com.au/libraries/images/systems/Waterproofing-Cracks-Bayset.png

Preparation:

  • 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.

Installation:

  • Square cut crack or control joints to a minimum depth of 15mm and width of 10mm. NOTE: Sealants require straight sides to adhere properly, do not V cut.

  • Install closed cell backing rod and fill with Polyurethane or neutral cure silicone.

  • Install 100mm wide bond breaking tape, centred over crack or control joint.

  • 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 460 Primer to substrate to be waterproofed. 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 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.

  • If required, install CTA Eco Screed with Efflock, ensuring a minimum of 1 : 100 fall to the waste outlet. In the case of control joints, ensure that movement joints are incorporated directly over the control joints in the substrate. This movement joint may be omitted in the case where this method has been applied to waterproofing a crack. 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 Promaxset or CTA Pro Premium. In the case of control joints, ensure that movement joints are incorporated directly over the control joints in the substrate. This movement joint may be omitted in the case where this method has been applied to waterproofing a crack. All other movement joints to be incorporated in accordance with AS 3958.1 Guide to the Installation of Ceramic Tiles. 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.

  • 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.