Gripset 2P

Gripset 2P is a two-part flexible cementitious waterproofing membrane for under-tile, immersed and subterranean applications. It combines cement-based durability with flexibility, high adhesion and fast drying for wet areas, balconies, pools, tanks, planter boxes and retaining structures.

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What it does

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.

Numbers that matter

• >200% elongation (AS1145.3): Class II flexibility rating, allowing the membrane to bridge movement across joints in fibre cement sheets and aerated concrete panels.
• 1.2mm dry film thickness (DFT): Achieved by applying two coats at a minimum coverage rate of 1.5 litres/m² (750 microns wet film thickness per coat) to guarantee waterproof integrity.
• 24-hour tiling window: Fast-curing formulation allows the application of sand-cement screeds or tile adhesives within one day of membrane installation.
• 7-day immersion cure: Full chemical cure window required before filling water features, swimming pools, or potable water tanks.
• >1MPa tensile strength (AS1145.3): High cohesive and adhesive strength to withstand shear forces under heavy screeds and tiled finishes.

Where to use it

This membrane is designed for commercial, residential, and industrial applications across the following zones:

• Wet areas and tiled zones: Bathrooms, laundries, and internal tiled floors.
• External structures: Balconies, decks, podiums, planter boxes, earth shelters, and terrace floors.
• Water containment: Swimming pools, water features, potable water storage facilities, retention vessels, and water tanks.
• Subterranean structures: Retaining walls and earth shelters (positive side only).

Substrate preparation and priming

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:

• Porous substrates (concrete, render, plasterboard): Prime with Gripset GP Primer at a minimum coverage of 1 litre per 8–10m².
• Non-porous substrates: Prime with Gripset OP Primer at a minimum coverage of 1 litre per 10m².
• Green or damp concrete with residual moisture: Prime with Xpress Primer H2O Plus at a minimum coverage of 1 litre per 8m².
• Substrates subject to rising damp or residual moisture >80% RH: Apply 1 to 2 coats of Gripset E60 at a minimum coverage of 1 litre per 3m² per coat.

Detailing and joint preparation

All movement zones, junctions, penetrations, and cracks must be detailed prior to general membrane application. Use the following system configurations:

• Bond breaker joints (AS 3740 & AS 4654.1): Apply Elastoproof B50 Joint Band embedded in a 150mm wide strip of wet membrane, then fully encapsulate with a second coat. Alternatively, install self-adhesive BRW PF Tape centrally over the joint. Note: BRW PF Tape is not suitable for immersed applications.
• Pipes and penetrations: Fit Elastoproof Collars over the pipe neck into a wet coat of membrane, or seal the base perimeter with a bead of RLA Max SMP 25.
• Static cracks (1mm to 6mm) and fixing holes: Fill flush with RLA Max SMP 25 sealant and overlay with RLA Waterproofing Bandage, Elastoproof B50 Joint Band, or BRW PF Tape.

Mixing and application

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.

Limitations

• Not suitable for use as an exposed, trafficable surface.
• Do not apply to substrates subject to negative hydrostatic pressure.
• Do not apply if rain is imminent, or when surface or ambient temperatures are below 5°C or above 30°C.
• Do not use BRW PF Tape, RLA Max SMP 25, or Butyl Squares in fully immersed applications (swimming pools or water tanks).
• All subsequent top coats, screeds, or finishes applied over the cured membrane must be water-based and solvent-free.
• When tiling directly over the membrane, polymer-modified cement-based adhesives (such as Gripset C-LITE, C-MASTIC, C-RUBBER, or C-STONE) must be used.