Waterproofing Membranes

Shop liquid-applied waterproofing membranes for bathrooms, balconies, rooftops, podiums and below-ground applications. Compare polyurethane, acrylic, polymer-modified, cementitious and bituminous systems for trade and DIY projects.

Waterproofing Membranes
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Shop Waterproofing Membranes by Type

Browse genuine membrane families first, then confirm substrate, movement, exposure, finish and complete system compatibility.

Polyurethane Membranes

Liquid-applied PU systems for applications that require their documented flexibility, exposure performance and compatible primers.

Cementitious Membranes

Mineral-based systems commonly considered for concrete and masonry substrates; check movement, exposure and tiling requirements.

Water-Based & Flexible Membranes

A practical range for compatible internal and external specifications; confirm UV, immersion and finish limitations product by product.

Bituminous Membranes

Bitumen-based liquid systems for appropriate below-ground and protected applications; verify substrate, exposure and overcoating requirements.

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Selection guide

Choosing the Right Waterproofing Membrane

Select the membrane around substrate, movement, exposure and finish—not chemistry alone. Confirm the complete manufacturer system and current technical data before specification or application.

Substrate

Identify the substrate, its strength, porosity and existing finish. Repair defects and prepare it to the membrane manufacturer’s current requirements.

Movement & Detailing

Confirm expected movement and detail joints, corners, penetrations and terminations with components compatible with the selected membrane system.

Exposure & Finish

Check UV, weather, immersion, traffic and tiling requirements. A membrane suitable below tiles is not automatically suitable when left exposed.

System Compatibility

Use nominated primers, reinforcement, adhesives and protective finishes. Confirm layer compatibility, coverage, cure and recoat windows before application.

Complete the system

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Common Trade Questions

Waterproofing Membrane FAQs

Selection depends on the substrate, exposure, expected movement, water pressure and finished surface. Acrylic and polymer membranes are commonly used under tiles; polyurethane and hybrid systems suit higher-movement or external applications where specifically rated; cementitious systems suit compatible concrete and masonry; and bituminous systems are commonly used in protected below-ground work. Confirm the product data sheet and complete system before purchasing.

Polyurethane membranes form highly flexible films and are generally better suited to movement-prone substrates. Cementitious membranes bond strongly to concrete and masonry and may be suitable for hydrostatic, immersed or negative-side conditions when the specific product permits it. Exposure, substrate moisture, UV, finish and manufacturer requirements determine the correct system.

Use a membrane system specifically approved for external waterproofing and the intended finish. Exposed areas require UV-stable, weather-resistant products; membranes beneath tiles, screeds or toppings must be compatible with those materials. Substrate movement, falls, drainage, joints, traffic and AS 4654.2 detailing must also be addressed.

Selected polyurethane, cementitious and bituminous membranes can be used below ground, but only where the manufacturer approves the product for the relevant positive-side, negative-side, hydrostatic, immersed or root-exposed condition. Substrate moisture, drainage, protection and backfilling requirements form part of the complete system.

Yes, when the membrane is approved for tiling, has reached the required cure and is used with a compatible tile adhesive. Adhesive selection, screed configuration, movement joints and surface preparation must follow the membrane and adhesive manufacturers’ requirements. Do not tile over products intended only as exposed finishes.

Many do, but primer selection is product and substrate specific. Porous, dense, non-porous, damp or contaminated surfaces can require different preparation and primer systems. Use the primer nominated by the membrane manufacturer and observe moisture limits and overcoating windows; do not assume one primer suits every membrane.