For external surfaces and internal wet areas where rain washouts, early ponding, or slow drying times threaten the installation schedule, Xpress Multi Pro Membrane provides a fast-curing, water-based waterproofing barrier. It complies with AS 4858 and AS 4654.2, allowing rapid progression to subsequent trades on roofs, balconies, and internal bathrooms without the hazards of solvent-based polyurethane systems.
Xpress Multi Pro Membrane uses rapid-drying technology to form a rain-resistant finish within 3 hours. It withstands early ponding water and permanently wet conditions without blistering or re-emulsifying. This water-based, solvent-free formulation exhibits high elasticity to bridge joints and junctions under constant weathering, preventing moisture ingress into sub-floor structures.
For projects with critical handovers, using this membrane alongside Xpress Primer H2O Plus allows fast priming over green concrete or damp mineral substrates containing residual moisture.
Always verify wet film thickness during application using a wet film gauge to ensure compliance with the following minimum performance floors:
All surfaces must be clean, sound, dry, and free of laitance, curing compounds, and contaminants. Grind or abrasive-blast structurally unsound layers. Concrete must cure for 28 days; cement renders and screeds must cure for 7 days. Select and apply the appropriate primer before membrane installation:
All joints, junctions, movement zones, penetrations, and cracks must be sealed prior to membrane application:
Yes, this membrane is designed for exposed roof applications. Its UV and weather resistance, combined with early rain protection in 3 hours, makes it suitable for external surfaces without additional coverings, or under screeds and toppings.
Apply this product when the surface temperature is between 5°C and 30°C. Applying outside this range can affect cure times and the final performance of the membrane, potentially leading to issues.
Yes, it complies with AS 4858 for internal wet areas and AS 4654.2 for external above-ground applications. This provides the necessary assurance for building code compliance and project specification requirements.
Gripset Xpress Multi Pro forms a rain-resistant finish in just 3 hours and withstands early ponding water. This significantly reduces the risk of re-emulsification or washout from unexpected weather, protecting your work.
| Application | Key benefit | Primary trades |
|---|---|---|
| Exposed roofs, parapets, external walls | Withstands harsh UV and weather exposure. Forms a rain-resistant finish in 3 hours, avoiding re-emulsification. | Waterproofers, Roofers |
| Internal wet areas (bathrooms, laundries) | Complies with AS 4858. Highly flexible and low water absorption ensures reliable protection under tiles. | Tilers, Waterproofers, Builders |
| Balconies, decks, podiums, terrace floors | Class III elastomeric properties handle movement. Light foot trafficable and withstands early ponding water. | Waterproofers, Landscapers, Builders |
| Waterproofing under screeds and toppings | Low vapour transmission and compliance with AS 4654.2 provides a robust, compliant barrier for covered outdoor areas. | Waterproofers, Tilers, Builders |
Ensure all surfaces are clean, dry (or appropriately primed for moisture), sound, and free of laitance, dust, grease, coatings, moss, or contaminants that could impair adhesion.
Mechanically clean with vacuum or pressure air. Prime with Gripset GP Primer.
Use Xpress H2O Plus primer or Gripset E60 for surfaces exceeding 80% RH or 5% MC. Perform ASTM F2170 or F2659 tests as required.
All joints, transitions, penetrations, and drainage points must be correctly sealed before membrane application using suitable detailing materials.
Embed band into wet coat of membrane, press out air pockets, and top-coat immediately.
Apply dry tape over joints, remove release liner, press firmly using a roller or spatula, then apply membrane over the top.
Apply Gripset Xpress Multi Pro in multiple coats to achieve required film build for the exposure and service conditions.
Apply 2 coats at 750 microns wet film per coat (1.5L/m² total) for a minimum 0.8mm dry film thickness.
Apply 3 coats at 750/750/500 microns wet film (2L/m² total) to achieve 1.0mm dry film. Use perpendicular strokes per coat.
After full membrane cure, tiling or screeding can be performed using compatible adhesives or screed systems.
Use polymer-modified cement adhesives such as Gripset C-LITE, C-RUBBER, or C-MASTIC.
Incorporate Gripset 11Y or use Gripset C-BED screed system for enhanced bond to membrane.
Wear safety shoes, overalls, and safety glasses. Nitrile rubber gloves are suitable for intermittent contact. Wash hands thoroughly before eating, drinking, or using the toilet.
Natural ventilation is adequate under normal use conditions.
Store in a cool, dry, well-ventilated place, out of direct sunlight. Keep containers closed and avoid freezing conditions. Shelf life is 12 months in original unopened packaging. Dispose of material and containers according to local regulations; wet product can be cleaned with water, dried product requires mechanical removal.
Correct surface preparation and priming are crucial for the adhesion and long-term performance of Gripset Xpress Multi Pro.
Surface prep: All surfaces must be clean, sound, smooth, and dry, free from loose material, dirt, dust, oil, grease, wax, laitance, or existing coatings. Mechanically remove structurally unsound layers. Point masonry flush, and fill voids, holes, and non-structural cracks. Concrete requires at least 28 days cure, and cement render or screeds require at least 7 days cure.
Primer: Required. Select primer based on substrate type and moisture conditions:
| Property | Value |
|---|---|
| Form | Viscous Liquid |
| Colour | Light grey |
| Specific Gravity | 1.3 kg/litre |
| Elongation Classification (AS1145.3) | >300% Class III |
| Tensile Strength (AS1145.3) | >1MPa |
| Water Absorption (AS 3558.1) | 3% |
| Water Vapour Transmission (ASTM E96 Desiccant method) | 6g/m²/24hours |
| Compliance to AS4858 | PASS |
| Compliance to AS4654.1 | PASS |
| Recoat Time | 1-2 hours |
| Ponding Water Resistance | 3 hours |
| Full Cure / Flood Test | 24 hours |
| Shelf Life | 12 months |
| Container Size | 15 Litre pails |
| pH | 9.5 |
Here are some common examples on where Gripset Xpress Multi Pro Membrane used by our customers.
