For internal and external wet areas requiring compliant, rapid-curing waterproofing under tile, screed, or in fully immersed designs, Gripset 2P Class II Membrane provides a flexible, two-part cementitious barrier. It forms a high-adhesion waterproofing layer over concrete, masonry, fibre cement sheeting, plasterboard, and aerated concrete blocks, maintaining its structure on vertical joints and feature walls without sagging.
Gripset 2P Class II Membrane cures to a tough elastomeric barrier that withstands continuous water pressure in swimming pools, water features, and potable water storage tanks. The two-part chemical cure is less dependent on ambient evaporation than one-part membranes, enabling the wet film to dry reliably in cool and humid conditions. Once cured, it forms a highly compatible surface for polymer-modified cement-based tile adhesives, screeds, and renders, accommodating normal substrate expansion and contraction without cracking or delaminating.
This membrane is designed for commercial, residential, and industrial applications across the following zones:
Surfaces must be clean, dry, and free of laitance, curing compounds, existing coatings, and general contaminants. Structurally unsound layers must be mechanically removed by grinding or abrasive blasting. Concrete must cure for 28 days and render or screeds for 7 days before application. Apply the appropriate primer based on substrate conditions:
All movement zones, junctions, penetrations, and cracks must be detailed prior to general membrane application. Use the following system configurations:
Gripset 2P is a two-component kit consisting of a 10-litre liquid component (Part A) and a 15kg dry powder bag (Part B), yielding 20 litres of mixed membrane. For smaller batches, mix equal parts by volume (1:1 liquid to powder). Always add the powder slowly to the liquid. Mix continuously using an electric stirrer with a paddle attachment at slow-to-medium speed until a lump-free, homogenous consistency is reached. Allow the mix to settle for 3 to 5 minutes, then re-stir. Do not mix by hand.
Apply in two coats using a brush, medium-to-high nap roller, or spray unit, changing the application direction of the second coat relative to the first. Monitor application thicknesses during installation with a wet film gauge to ensure a minimum of 750 microns wet film per coat. A 15-litre pail volume equivalent of mixed membrane covers 13m² of finished, two-coat system on smooth substrates; porous or uneven surfaces will require higher material volumes to achieve the required 1.2mm dry film thickness.
Yes, Gripset 2P is certified to AS/NZ 4020 – 2018, making it suitable for potable water storage applications and water tanks. This certification confirms it will not contaminate drinking water.
You can re-coat Gripset 2P in 2-4 hours, and it's ready for tiling or toppings in 24 hours. For full flood testing, allow 72 hours, and for continuous immersion, a 7-day cure is required.
No, Gripset 2P is not designed for trafficable surfaces. It also should not be used in areas subject to negative hydrostatic pressure, as this can compromise membrane integrity.
| Application | Key benefit | Primary trades |
|---|---|---|
| Internal wet areas (bathrooms, laundries) | Achieves AS4858 compliance for internal wet areas, providing a durable, flexible waterproof layer under tiles and screeds. | Tilers, Waterproofers, Builders |
| External wet areas (balconies, decks, podiums) | Meets AS4654.1 for external wet areas, resisting continuous water exposure and accommodating normal substrate movement with >200% elongation. | Waterproofers, Builders, Landscapers |
| Potable water tanks and storage facilities | Certified to AS/NZ 4020 – 2018, ensuring water remains safe for human consumption without leaching contaminants. | Plumbers, Tank Manufacturers, Civil Contractors |
| Swimming pools and water features | Withstands continuously immersed environments, offering strong adhesion and a durable, tough membrane that handles static water loads. | Pool Builders, Waterproofers |
| Planter boxes and retaining walls | Provides reliable waterproofing for subterranean and earth-retaining structures, protecting against moisture ingress and maintaining durability. | Landscapers, Builders |
| General tiled areas to prevent moisture ingress | Acts as a Class II membrane, providing a robust barrier against moisture and a compatible surface for direct tile adhesive overlay. | Tilers, Renovators |
Clean, sound and dry substrate; repair defects. Prime to suit: GP (porous), OP (non-porous), XPRESS H2O Plus (green/damp), E60 (residual moisture/rising damp).
Add powder to liquid (1:1 by volume for partial mixes). Mechanically mix to a lump-free, homogenous blend. Rest 3–5 minutes; re-stir before use.
Apply by brush/roller/spray in 2 coats at 1.5 L/m² total, perpendicular directions. Verify with wet film gauge (~750 µm per coat) to achieve ~1.2 mm DFT.
Signal Word: Danger
When handling the Gripset 2P Dry component, wear safety shoes, overalls, chemical-resistant gloves (nitrile rubber recommended for intermittent contact), safety glasses, and a dust mask to prevent inhalation of dust.
Ensure adequate ventilation to maintain air concentrations below occupational exposure standards. Use only in well-ventilated areas or with local exhaust ventilation. Avoid generating and inhaling dust.
Store components in original unopened packaging for up to 12 months in a cool, dry, well-ventilated place, out of direct sunlight. Avoid freezing and cold floors. Keep containers tightly closed when not in use. Dispose of contents and containers in accordance with local regulations.
Proper surface preparation and priming are essential for Gripset 2P to achieve optimal adhesion and long-term performance across various substrates.
Surface prep: Ensure surfaces are cured (concrete 28 days, render/screeds 7 days), clean, sound, and free from contaminants like oil, grease, or laitance. Mechanically remove unsound layers. Fill all defects, voids, and non-structural cracks up to 6mm with a suitable repair mortar or sealant.
Primer: Required. For porous surfaces, use Gripset GP Primer at 1L/8-10m². For non-porous, use Gripset OP Primer at 1L/10m². For damp surfaces with residual moisture, Xpress Primer H2O Plus (1L/8m²) or Gripset E60 (1L/3m² per coat for >80%RH or rising damp) is required.
Surface prep: Surfaces must be sound, dry, and free from dust, dirt, and loose material. All joints and fasteners should be installed to manufacturer specifications and relevant building standards.
Primer: Required. For porous surfaces, use Gripset GP Primer at 1L/8-10m². For non-porous, use Gripset OP Primer at 1L/10m².
Surface prep: Ensure surfaces are clean, dry, and free from dust or loose particles. Address any surface defects before priming and membrane application.
Primer: Required. For porous surfaces, use Gripset GP Primer at 1L/8-10m². For non-porous, use Gripset OP Primer at 1L/10m².
| Property | Value |
|---|---|
| Compliance | AS4858, AS4654.1 (Class II Membrane), AS/NZ 4020-2018 (Potable Water) |
| Appearance (Dry Film) | Light grey |
| Elongation (AS1145.3) | >200% |
| Tensile Strength (AS1145.3) | >1 MPa |
| Water Vapour Transmission (ASTM E96) | 3 g/m²/24 hours |
| Water Absorption (AS 3558.1) | 2% |
| Specific Gravity | 1.3 kg/dm³ |
| Mix Ratio (Volume) | 1:1 powder/liquid (for smaller quantities) |
| Total Yield (from 1 kit) | 20 litres |
| Minimum Film Thickness (Dry) | 1.2 mm (2 coats) |
| Total Coverage (Minimum) | 1.5 litres/m² |
| Pot Life | 1 hour |
| Re-coat Time | 2-4 hours |
| Tiling/Toppings Time | 24 hours |
| Flood Test Time | 72 hours |
| Immersion Time (Full Cure) | 7 days |
| Application Temperature Range | 5°C to 30°C |
| Shelf Life | 12 months (unopened) |
Here are some common examples on where Gripset 2P Class II Membrane used by our customers.
