Surfaces must be prepared thoroughly before commencing. Surfaces are to be sound, stable, dry and clean, free of loose foreign matter including any surface residues or existing coatings. Buildings are to be constructed to relevant building standards and manufacturer’s recommendations are to be followed for all building materials used.

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

Priming (Membrane applications)

• Bitumen Rubber: Self priming, diluted 1:3 parts with water for porous surfaces
• Super Primer: For non porous and smooth surfaces
• Damp Stop: For surfaces subjected to rising damp or residual moisture

Detailing: All critical areas such as joints, junctions, movement zones, penetrations and drainage points are to be correctly sealed prior to membrane application.

Membrane application: A minimum of 2 coats is to be applied at a total minimum coverage of 1.5 Litres/m2, forming a dried film thickness of approx 1.2mm. For immersed applications a total minimum coverage of 2 Litres/m2 is required. Apply subsequent coats at different directions to the previous coat. Apply by roller, brush or spray unit

Paint Application: A protective bitumen paint can be formed by mixing the Betta Bitumen Rubber and clean water at a 1: 1 ratio.

Example: If using 1litre of Bitumen rubber, add 1litre of water. This will form 2litres of Bitumen Paint

Drying

• Tack Free  – 60-90mins
• Recoat – 2-4hour
• Dry Film  – 24 hours
• Back Filling Underground – 4 days
• Immersed areas – 21 days

• 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