Surfaces must be prepared thoroughly before commencing application. All substrates must be structurally sound, stable, dry, and clean, Smooth shiny surfaces to be roughened or etched. Rough surfaces are to be evened or filled first. Building surfaces must be constructed to manufacturer’s recommendations and relevant building standards in force at time of membrane application. All surfaces are to be free of sharp protruding surfaces, loose material, de-bonded coatings, curing membranes/agents, release agents, wax residues, foreign particles, laitance, algae and moss, grime, oils, animal fats or grease remains.

Structurally unsound layers and surface contaminants are to be mechanically removed by abrasive blasting, blast tracking, grinding or equivalent methods.

Primer: Select appropriate primer if required and apply according to the primers instructions.

• Betta Prep Coat Primer – for general porous vertical and horizontal building surfaces. Brush or roller apply primer to total surface area at a minimum coverage of 1 litre per 6m2 and allow drying for 30 minutes or once wet film dries to a clear transparent coating
• Betta Super Primer – for non porous, smooth and dense surfaces. Brush or roller apply primer to total surface area at a minimum coverage of 1 litre per 10m2 and allow to dry for 1 hour
• Betta Damp Stop – for surfaces with residual or rising damp. Apply by brush or roller in 1-2 coats at a minimum coverage of 1litre per 8m2 per coat. Allow to dry for a minimum 24 hours before applying membrane. Primer must be tack free before applying membrane.

Detailing:

Install a bond breaker system such as Betta Joint Band, Reinforcing Fabric and Waterproof Corners. This is a requirement to meet AS 3740 Australian Waterproofing Standards

Once the Elastic Joint Band is in place, apply Betta Under Tile Membrane to the total floor area and to walls at 150mm high in general wet areas and balcony decks, and at 1.8m high in shower alcoves. A continuous seamless membrane should be the final finish to the total area upon completion of the waterproofing membrane application.

A minimum of 2 coats is to be applied at a total minimum coverage of 1.5 Litre/m2, forming a dried film thickness of approx 1.2mm. For vertical or pitched applications, coverage of 1Litre/m2 can be considered. Apply subsequent coats at different directions to the previous coat. Apply by roller, brush or spray unit

• Tack Free  – 45mins
• Recoat – 1 hour
• Dry Film  – 4 hours
• Tiling or toppings over – 4 hours
• Flood testing  – 16 hours

• Based on normal ambient conditions of 20oC, 50% RH.
• Temperature, humidity and porosity will vary dry times.
• Note – Once dried, ensure surface is wiped clean before tiling to remove any residues

• Only polymer modified cement based adhesives are to be used for tiling over Betta Under Tile Membrane
• Pre mixed tile adhesives are not recommended