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When waterproofing a critical wet area or exposed surface, the risks of continuous moisture, early ponding, or re-emulsification can compromise integrity. Gripset P39 delivers robust protection in these challenging conditions. This fibre-enhanced hybrid polyurethane resists permanent wetness and early water ponding. It maintains a consistent barrier, eliminating costly call-backs from compromised membranes in both undertile and exposed applications.
Gripset P39 is formulated to prevent membrane failure caused by early water ponding or prolonged exposure to permanently wet conditions. Unlike many standard membranes, this fibre-enhanced hybrid polyurethane membrane is engineered to uniquely resist re-emulsification. It delivers a robust, flexible barrier in critical applications like internal wet areas, balconies, and roofs, whether installed undertile or as an exposed, light-trafficable finish. This advanced formulation ensures the membrane's integrity, even when pushed to its limits by challenging site conditions.
A membrane's flexibility and durability are measured by its numbers. Gripset P39 achieves over 300% elongation, classified as Class III. This means a 10mm joint can stretch more than 3mm in either direction without failure, absorbing significant substrate movement. Its water absorption sits at just 4%, ensuring the membrane remains stable and effective in constantly wet environments. With a water vapour transmission rate of 1.6 g/m²/24 hours, it provides a strong barrier against moisture, protecting substrates from damage and preventing issues like efflorescence. These properties ensure compliance with AS 4858 and AS 4654.1, critical for both internal and external wet area applications.
Application of Gripset P39 requires a primed surface. Porous substrates benefit from Gripset GP Primer, while non-porous surfaces require Gripset OP Primer. For green or damp surfaces, Gripset Xpress Primer H2O Plus prepares the way. If the substrate faces residual moisture or rising damp, Gripset E-60 Primer establishes a robust foundation. Once primed, P39 applies smoothly with a brush or medium nap roller. Apply subsequent coats in opposing directions to ensure full coverage. A wet film gauge helps regulate the correct thickness per coat. Recoat times are between 2-4 hours, with tiling possible after 24-48 hours. Full cure and flood testing can occur after 72 hours. Clean up wet membrane with water; dried product requires mechanical removal.
Gripset P39 excels in environments where waterproofing integrity is paramount. For internal wet areas like bathrooms and laundries, it provides a robust, seamless undertile membrane that resists re-emulsification, even in permanently wet conditions. On external surfaces such as balconies, decks, podiums, and roofs, it functions as a UV-stable, weather-resistant, light-trafficable finish. This protects the structure beneath without the need for additional coverings. It is also well-suited for roofs and other areas intended for screeds or toppings, where its resistance to re-emulsification ensures stability before the final finish is applied.
This product integrates into comprehensive waterproofing systems. All critical areas, including joints, junctions, and penetrations, require detailing prior to membrane application. For dynamic joints, the Elastoproof B50 Joint Band is embedded into the wet Gripset P39, reinforcing the system's flexibility. Alternatively, RLA MAX SMP 25 Sealant forms bond breaker fillets at floor-to-wall junctions or seals around pipes and penetrations. When tiling directly over cured Gripset P39 in internal or external areas, use a polymer-modified cement-based adhesive like Gripset C-Rubber Waterproofing Membrane to ensure long-term bond strength and system compatibility.
Many waterproofing membranes offer flexibility and general resistance, but Gripset P39 distinguishes itself with a fibre-enhanced hybrid polyurethane formulation. Unlike standard liquid-applied membranes, it is specifically engineered to resist early water ponding and prevent re-emulsification in permanently wet conditions. This unique attribute ensures lasting integrity in the most challenging wet environments, allowing for its versatile use as both a critical undertile barrier and a durable, light-trafficable exposed finish.
Yes, Gripset P39 is formulated for exposed applications on roofs and parapets. It provides outstanding weather and UV resistance, is light foot trafficable, and meets AS 4654.1 for external wet areas.
No, Gripset P39 will not re-emulsify once cured. It is designed to handle early water ponding and permanently wet conditions, which prevents failure in challenging areas like balconies or flat roofs under toppings.
Yes, Gripset P39 must be applied to primed surfaces. The correct primer depends on the substrate's condition; options include Gripset GP Primer for porous surfaces or Gripset E60 for damp surfaces with residual moisture.
No, Gripset P39 is not to be used in areas subject to negative hydrostatic pressure. Using it in such conditions will lead to membrane failure and water ingress.
| Application | Key benefit | Primary trades |
|---|---|---|
| Exposed roofs, parapets, and external surfaces | Outstanding weather and UV resistance for long-term protection, light foot trafficable. | Waterproofers, Roofers |
| Internal wet areas, bathrooms, laundries, and general tiled areas | AS 4858 compliance, elastomeric to accommodate movement, low vapour transmission to prevent moisture ingress. | Tilers, Waterproofers |
| Balconies, decks, podiums, terrace floors | AS 4654.1 compliance, early ponding water resistance, won't re-emulsify in permanently wet conditions. | Waterproofers, Builders |
| Roofs to be covered with screeds and toppings | Withstands permanently wet conditions without re-emulsification, protecting structural elements beneath. | Waterproofers, Builders |
| General structural waterproofing for commercial, industrial, residential | High flexibility (>300% Class III elongation), robust adhesion, fungi and algae resistance. | Waterproofers, Builders |
Ensure all surfaces are clean, dry, and structurally sound. Remove laitance, contaminants, and unstable material.
Prime with Gripset GP Primer at 1L/8–10m².
Prime with Gripset OP Primer at 1L/12m².
Apply Gripset P39 by brush or roller in coats perpendicular to each other.
Apply 2 coats at 1.5L/m² total to achieve 1mm dry film.
Apply 3 coats at 2L/m² total for a 1.2mm dry film.
This material is classified as non-hazardous chemical, non-dangerous goods.
Wear safety shoes, overalls, gloves (nitrile rubber recommended for intermittent contact), and safety glasses.
Natural ventilation should be adequate under normal use conditions.
Store in original unopened packaging for up to 12 months. Keep in a cool, dry, well-ventilated place, out of direct sunlight, and off cold floors. Avoid freezing conditions. Dispose of material and container according to local regulations.
Proper surface preparation and priming are critical for Gripset P39 to achieve its documented performance and prevent adhesion failure.
Surface prep: Surfaces must be clean, sound, smooth, and dry, free from loose material, dust, oil, and existing coatings. Mechanically remove unsound layers. Fill all defects, voids, and non-structural cracks. Concrete requires 28 days cure, cement render/screeds 7 days cure.
Primer: Required. Select from Gripset GP Primer (porous), Gripset OP Primer (non-porous), Xpress Primer H2O Plus (green/damp with residual moisture), or Gripset E60 (damp, rising damp, high residual moisture >80%RH or 5% MC).
Surface prep: Ensure surfaces are clean, sound, smooth, and dry. Remove all contaminants that might compromise adhesion. Building surfaces must be fit for purpose and installed to manufacturer recommendations.
Primer: Required. Select from Gripset GP Primer (porous), Gripset OP Primer (non-porous), Xpress Primer H2O Plus (green/damp with residual moisture), or Gripset E60 (damp, rising damp, high residual moisture >80%RH or 5% MC).
| 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) | >3 MPa |
| Water Absorption (AS 3558.1) | 4% |
| Water Vapour Transmission (ASTM E96 Desiccant method) | 1.6 g/m²/24 hours |
| Compliance to AS4858 | PASS |
| Compliance to AS 4654.1 | PASS |
| Minimum Application Temperature | 5 °C |
| Maximum Application Temperature | 30 °C |
| Recoat Time | 2-4 hours |
| Tiling/Toppings Time | 24-48 hours |
| Full Cure/Flood Test Time | 72 hours |
| Shelf Life | 12 months |
| Packaging | 15 Litre pails |
Here are some common examples on where Gripset P39 used by our customers.
