Gripset P39: A Technical Overview
Gripset P39 is a high-performance, fibre-reinforced hybrid polyurethane membrane engineered for internal wet areas and fully exposed exterior conditions.
Compliant with AS4858 and AS4654.1, it delivers superior waterproofing with exceptionally low vapour transmission, resisting fungi, algae, and UV degradation.
Its advanced chemistry withstands early water ponding without re-emulsifying, making it ideal for permanently wet environments.
Designed for Australian climates, Gripset P39 protects substrates under tile or as an exposed trafficable finish, ensuring long-term durability and reduced maintenance costs.
Core Features & Specifications
- Solvent-free, non-hazardous hybrid polyurethane formulation.
- Outstanding UV and weather resistance for long-term exterior durability.
- Early ponding water resistance — safe for permanently wet areas.
- Low vapour transmission and minimal water absorption for superior substrate protection.
- High flexibility (>300% elongation) accommodates structural movement without failure.
- Light foot trafficable when cured, expanding usage options.
- Complies with AS4858 & AS4654.1 for internal and external wet areas.
The Gripset P39 Advantage
- Engineered for Australian building standards — ensuring compliance and reliability.
- Fibre-reinforced composition increases tensile strength (>3MPa) for high-traffic and exposed areas.
- Resistant to algae, fungi, and dirt build-up, maintaining a clean, professional finish.
- Compatible with Gripset primers and detailing systems for full system warranty.
Proactive Troubleshooting
Scenario: Applying to an unprimed porous substrate
Potential Outcome: Poor adhesion and premature membrane failure.
Adheseal Best Practice: Always apply Gripset GP Primer on porous surfaces at 1L/8–10m² before membrane application.
Scenario: Installing in high-moisture conditions without correct primer
Potential Outcome: Blistering and adhesion loss due to trapped moisture.
Adheseal Best Practice: Use XPRESS Primer H2O Plus or Gripset E60 for damp or rising damp substrates.
Applications in Practice: Trade Scenarios
For Waterproofers (Specifier/Engineer): Balcony & Podium Deck Protection
The Professional's Challenge
Balcony membranes face thermal expansion, UV degradation, and standing water, demanding a compliant, high-performance solution.
The Adheseal Solution: Engineered Certainty in Practice
Gripset P39's AS4654.1 compliance, high elongation, and early ponding resistance make it ideal for exposed decks. Applied in 3 coats at 2L/m² for a 1.2mm dry film, it provides robust waterproofing under tiles or as an exposed finish.
Best Practice Note
Use Elastoproof detailing systems for junctions and penetrations to ensure system integrity.
For Builders (Business Owner/Operator): Wet Area Compliance
The Professional's Challenge
Internal wet areas must comply with AS3740 and prevent costly moisture ingress.
The Adheseal Solution: Engineered Certainty in Practice
Applied over Gripset GP Primer, P39 provides a seamless, flexible membrane with low vapour transmission, ensuring compliant wet area waterproofing.
Best Practice Note
Apply a minimum of 2 coats for 1mm dry film thickness before tiling; use polymer-modified adhesives for direct tile application.
Frequently Asked Questions
Can Gripset P39 be left exposed to the weather?
Yes. Gripset P39 is UV and weather resistant, making it suitable as an exposed, light-trafficable membrane on roofs, balconies, and parapets. Apply 3 coats at a total 2L/m² to achieve a 1.2mm dry film for maximum durability.
What primer should I use before applying Gripset P39?
Use Gripset GP Primer for porous surfaces, Gripset OP Primer for non-porous surfaces, XPRESS Primer H2O Plus for green/damp surfaces, and Gripset E60 for substrates subject to rising damp.
How soon can I tile over Gripset P39?
Allow 24–48 hours after the final coat before tiling. Always use a polymer-modified cement-based adhesive for best bond performance.
Is Gripset P39 suitable for internal wet areas?
Yes. P39 meets AS4858 compliance and is ideal for bathrooms, laundries, and wet areas, providing a flexible, low vapour transmission barrier under tiles.
Can it be applied over damp concrete?
Yes, provided you use the correct primer. For damp concrete or residual moisture above 80% RH, use Gripset E60 to ensure adhesion and prevent blistering.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Internal wet areas, bathrooms, laundries | Seamless AS4858-compliant waterproofing with low vapour transmission | Waterproofers, Tilers, Builders |
| Balconies, decks, podiums | AS4654.1 compliance with UV and weather resistance for exposed finishes | Waterproofers, Builders |
| Roofs and parapets | Durable, trafficable finish protecting substrates from UV and moisture | Roofers, Builders |
| Under tile applications | Strong adhesion with polymer-modified adhesives for long-term performance | Tilers, Builders |
Applying Gripset P39: Enhanced Protocols & Best Practices
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Surface Preparation
Ensure all surfaces are clean, dry, and structurally sound. Remove laitance, contaminants, and unstable material.
Porous Surfaces
Prime with Gripset GP Primer at 1L/8–10m².
Non-Porous Surfaces
Prime with Gripset OP Primer at 1L/12m².
Timing: Allow primer to dry before applying membrane.Pro Tip: For damp or green concrete, use XPRESS Primer H2O Plus or Gripset E60. -
Membrane Application
Apply Gripset P39 by brush or roller in coats perpendicular to each other.
Under Tile
Apply 2 coats at 1.5L/m² total to achieve 1mm dry film.
Exposed Finish
Apply 3 coats at 2L/m² total for a 1.2mm dry film.
Timing: 2–4 hours recoat; 24–48 hours before tiling.Pro Tip: Use a wet film gauge to ensure correct thickness.
Limitations & Safety
Product Limitations
Do not apply when rain is imminent or when surface temperature is below 5°C or above 30°C.
Not suitable for areas subject to negative hydrostatic pressure.
All topcoats over P39 must be solvent-free to prevent membrane damage.
Safety & Handling Requirements
Personal Protective Equipment
Wear nitrile gloves, safety glasses, and long sleeves to avoid skin and eye contact. Use knee protection when applying on floors.
Ventilation Requirements
Ensure adequate ventilation during application in enclosed areas.
Fire & Handling Precautions
Gripset P39 is solvent-free and non-flammable, but store away from strong oxidisers and direct sunlight.
Emergency First Aid
Eyes:
Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do.
Skin:
Wash thoroughly with soap and water.
Inhaled:
Move to fresh air and rest in a comfortable position.
Swallowed:
Rinse mouth with water. Do not induce vomiting.
Seek medical attention immediately in all cases of serious exposure.
Gripset P39 Application Guide
Concrete, Render & Masonry
Surface Preparation
Ensure surfaces are cured (28 days for concrete), clean, sound, smooth, and free from contaminants such as dust, oil, or curing compounds. Fill voids and cracks with a suitable repair mortar.
Primer Requirements
Primer required for optimal adhesion
Apply Gripset GP Primer at 1L/8–10m² before membrane application.
Gripset GP PrimerFibre Cement Sheeting & Plasterboard
Surface Preparation
Install to manufacturer’s recommendations, ensure joints are flush, and remove dust prior to priming.
Primer Requirements
Primer required for critical applications
Use Gripset GP Primer at 1L/8–10m².
Gripset GP PrimerTimber Sheeting & External Grade Plywood
Surface Preparation
Secure sheets with all fixings flush. Sand smooth any sharp edges. Ensure substrate is dry and structurally sound.
Primer Requirements
Primer required
Apply Gripset OP Primer at 1L/12m².
Gripset OP PrimerAerated Concrete Panels & Blocks
Surface Preparation
Point flush and fill all surface defects. Remove dust and contaminants prior to priming.
Primer Requirements
Primer required
Use Gripset GP Primer at 1L/8–10m².
Gripset GP Primer
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