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When the job demands robust waterproofing against constant water pressure, from underground basements to potable water tanks, the choice of membrane is critical. Gripset C-1P provides a single-component, fibre-reinforced solution that handles both positive and negative hydrostatic pressure. This flexible cementitious membrane ensures durable protection and exceptional crack bridging, simplifying complex projects with reliable performance.
Gripset C-1P was engineered to deliver high-performance waterproofing in challenging, continuously wet, and immersed environments. It fills the need for a versatile, one-component solution that resists significant hydrostatic pressure from either side, whether in basement walls, lift pits, or water storage facilities. Its fibre-reinforced composition ensures superior flexibility and crack bridging, making it suitable for concrete and masonry structures subject to movement or exposure.
Gripset C-1P is supplied as a light grey powder, simplifying logistics as a single-component product. It mixes easily with water using an electric stirrer, ensuring a homogenous, lump-free consistency. Water ratios can be adjusted for either roller/brush or trowel application, providing flexibility on site. For porous surfaces, pre-dampening is often sufficient, though Gripset OP Primer is recommended for non-porous or burnished concrete to ensure optimal adhesion. Applications require a minimum of two coats by trowel or three by roller to achieve the critical 2mm dry film thickness, with subsequent coats applied in different directions. Crucially, allow 2-4 hours between coats and 7-10 days for full immersion or exposure to water pressure.
Detailing critical areas such as joints, junctions, and penetrations must be completed before membrane application. Use companion products like ELASTOPROOF B50 JOINT BAND or BRW PF TAPE for bond breakers, and ELASTOPROOF COLLARS or RLA MAX SMP 25 for pipe penetrations. Clean tools with water while the product is wet; dried material requires mechanical removal.
Gripset C-1P frequently serves as the primary waterproofing membrane in critical water containment systems, such as potable water tanks. In these demanding applications, the sequence begins with thorough surface preparation, often involving Gripset 11Y Slurry Primer for concrete, followed by Gripset OP Primer. Essential detailing includes prefabricated corners and Elastoproof Base Collars around penetrations, embedded into a fresh coat of Gripset C-1P. After full cure, the system may be sealed with a complementary top coat like Gripset 2P, ensuring comprehensive, long-term water protection and compliance.
Unlike more complex multi-component membranes, Gripset C-1P provides the convenience of a single-component, water-mix solution. This simplifies mixing and reduces potential errors on site, while still delivering high performance. It matches the exceptional flexibility (37% elongation), crack bridging (≥0.75mm), a 2mm dry film thickness, and robust hydrostatic pressure resistance (up to 5 bar positive / 1.5 bar negative) typically expected from two-part systems like Gripset 2P Waterproofing Membrane. Choose Gripset C-1P when the project benefits from the ease of a one-part system without compromising on critical performance metrics.
Yes, Gripset C-1P is approved for potable water storage facilities to AS 40200. This ensures it is safe for contact with drinking water when fully cured and installed correctly.
It handles up to 5 bar of positive hydrostatic pressure and 1.5 bar of negative pressure without visual penetration. This makes it suitable for demanding below-ground and immersed applications like basements or lift pits.
Yes, you can apply Gripset C-1P over damp or green concrete, provided there is no ponding or standing water. This can help maintain project schedules on site.
No, Gripset C-1P must be tiled over in swimming pools or spas. It is not designed to be an exposed coating in these applications.
A minimum dry film thickness of 2mm is required. Achieve this with 2 trowel coats (1.5mm wet film each) or 3 roller coats (1.0mm wet film each).
| Application | Key benefit | Primary trades |
|---|---|---|
| Basement walls, internal and external | Withstands up to 5 bar positive and 1.5 bar negative hydrostatic pressure, preventing water ingress in critical underground structures. | Waterproofers, builders, civil contractors |
| Potable water storage facilities and tanks | AS 40200 approval ensures safety for drinking water contact, providing compliance for essential services. | Waterproofers, plumbers, tank manufacturers |
| Waterproofing under tiles and pavers, internal and external wet areas | Flexible and crack bridging (≥0.75 mm) to accommodate substrate movement, compliant to AS4858 for internal wet areas. | Tilers, waterproofers, builders |
| Retaining walls, planter boxes, earth shelters | Withstands UV light exposure and can be applied over damp or green concrete, allowing flexibility in project sequencing. | Landscapers, builders, waterproofers |
| Lift pits | High hydrostatic pressure resistance and ability to apply over damp concrete reduces downtime and simplifies complex installations. | Waterproofers, lift installers, builders |
Ensure substrates are clean, sound, smooth and free from contaminants such as laitance, dust, oil, grease, curing agents, moss or algae. Fill voids, cracks (≥1 mm to 6 mm), and pitted areas with suitable repair mortar or sealant. Remove structurally unsound layers by mechanical means.
Pre-dampen with a light water mist to saturated surface dry (SSD) condition, avoiding standing water before membrane application.
Mechanically abrade steel-trowelled or burnished concrete to open the surface, clean thoroughly, then pre-dampen or prime with Gripset OP Primer at ~1 L/10 m².
Mix Gripset C-1P powder with clean water using an electric stirrer with a paddle attachment. Always add powder to water to avoid lumps. Achieve a lump-free, homogenous consistency.
Use 4.2 L water per 15 kg bag (approx. 280 mL water/kg powder or 1:3.5 water-to-powder by volume).
Use 3.0 L water per 15 kg bag (approx. 200 mL water/kg powder or 1:5 water-to-powder by volume).
Apply in a minimum of two coats (trowel) or three coats (roller) to achieve a final dry film thickness (DFT) of ≥2 mm. Apply each coat at right angles to the previous coat for uniform coverage.
First coat ~1.5 mm WFT; second coat after recoat time to build to ≥2 mm DFT.
Three coats at ~1.0 mm WFT per coat to achieve ≥2 mm total DFT.
Pre-seal all junctions, movement zones, penetrations, and drains with the specified bond breaker system before main coats.
Embed Elastoproof B50 Joint Band into wet coat, press firmly, then overcoat to encapsulate.
Apply BRW PF Tape centrally over joint; press to remove air pockets before coating.
Allow full curing before exposure to water pressure or immersion. Protect from rain during curing period.
Cure minimum 7 days before positive/negative water pressure exposure.
Cure minimum 10 days before immersion (e.g., pools, tanks).
Wear protective gloves, protective clothing, eye protection (safety glasses or chemical goggles), and face protection. When working with dry powder, wear a respirator to avoid breathing dust.
Use only outdoors or in a well-ventilated area to prevent respiratory irritation from dust/fumes.
Store in original, unopened packaging for up to 12 months. Keep containers securely sealed in a cool, dry, well-ventilated area, away from direct sunlight and freezing conditions. Store locked up. Dispose of contents and container at an authorised hazardous waste collection point according to local regulations.
Correct surface preparation and priming are critical for membrane adhesion and long-term performance, preventing callbacks from delamination.
Surface prep: Ensure surfaces are clean, sound, and free from loose material, dirt, oils, and laitance. Mechanically remove unsound layers. Concrete must cure for at least 28 days, and cement render for 7 days. Point masonry flush and fill all voids or cracks with a suitable repair mortar like Gripset 11Y.
Primer: Optional. On porous concrete, masonry, and mineral substrates, pre-dampen surfaces with a light water mist; avoid standing water. For steel-trowelled or burnished non-porous concrete, mechanically abrade to roughen, clean, and then pre-dampen. Alternatively, use Gripset OP Primer at 1 litre/10m².
Surface prep: Surfaces must be clean, dry, and free from contaminants. Ensure all sheeting is installed to manufacturer specifications and relevant building standards.
Primer: Optional. Pre-dampen lightly, ensuring no standing water, or prime with Gripset OP Primer.
Surface prep: Clean, sound, and dry, free from loose material and contaminants. Fill any defects or voids with appropriate repair materials.
Primer: Optional. Pre-dampen lightly, ensuring no standing water, or prime with Gripset OP Primer.
| Property | Value |
|---|---|
| Form | Light grey powder |
| Colour (Wet) | Dark Grey |
| Colour (Dry) | Dark Brown |
| Operating Temperature | -20°C to +70°C |
| Elongation (AS1145.3) | 37% (Class 1) |
| Tensile Strength (AS1145.3) | >2 MPa |
| Water Vapour Transmission (ASTM E96 Desiccant method) | 0.7 g/m² /24 hours |
| Water Absorption (AS 3558.1) | 9% |
| Crack Bridging (ISO13007-5) | ≥0.75 mm |
| Compliance to AS4858 | PASS |
| Depth of penetration of water under positive pressure 5 bars | No visual penetration below the membrane |
| Water impermeability in negative pressure 1.5 bars | No visual penetration below the membrane |
| Initial Tensile Adhesion Strength | ≥1 MPa |
| Water Immersion Tensile Adhesion Strength | ≥0.5 MPa |
| Freeze/Thaw Tensile Adhesion Strength | ≥0.5 MPa |
Here are some common examples on where Gripset C-1P used by our customers.
