Gripset P39 - UV Stable Waterproofing Membrane

Gripset P39 is a high-performance polyurethane waterproofing membrane designed for various applications, including roofs, wet areas, and external surfaces. Its advanced technology provides exceptional flexibility, durability, and resistance to water ponding and harsh weather conditions.
Vendor: Gripset
Availability: In Stock

Physical Properties

Appearance (wet and dry film): Grey
Form: Viscous paste
Drying (tack free): 1-2 hours
Re-coat: 2-4 hours
Dry film: 24 hours
Tiling or toppings over: 24-48 hours
Weatherproof vertical: 24 hours
Weatherproof horizontal: 48 hours
Flood test: 72 hours curing
Specific gravity: 1.3kg/litre
Shore a hardness (astm d2240-97): 60
Accelerated weathering (1000 hours arc tests): No changes to physical appearance or properties
Elongation classification (as/nz 4858 – 2004): >400% - class 3
Tensile strength: 1.8mpa
Water immersion test – 56 days: Pass
Bleach immersion test – 56 days: Pass
Detergent immersion test – 56 days: Pass
Heat ageing: Pass
Cyclic movement test: Pass
Water absorption test: Pass
Vapour transmission test: 1.2g/24h/m²

Shipping & Delivery

$15.95 shipping on all orders nationwide for most products

Gripset P39 - UV Stable Waterproofing Membrane

Vendor: Gripset

Gripset P39 - UV Stable Waterproofing Membrane


Vendor: Gripset

Gripset P39 - UV Stable Waterproofing Membrane


Gripset P39 is a high-performance, fiber-enhanced polyurethane membrane designed for versatile waterproofing applications. Its advanced hybrid technology delivers exceptional flexibility, elastomeric properties, and high tensile strength, making it ideal for both under-tile and exposed membrane installations. P39 excels in waterproofing, boasts low water vapor transmission, and uniquely withstands early water ponding and permanently wet conditions without re-emulsification.

Key Features:

  • Highly flexible and elastomeric
  • Low water vapor transmission and absorption
  • Excellent adhesion to various substrates
  • Outstanding weather resistance
  • Resists early water ponding and permanent wet conditions
  • Resistant to fungi and algae
  • Low dirt retention
  • Light foot trafficable
  • Solvent-free and non-hazardous

Suitable Substrates:

  • Concrete, render, and masonry
  • Fibre cement sheeting, plasterboard, and structural sheeting
  • Wet area timber sheeting and external grade plywood
  • Aerated concrete panels and blocks


  • Exposed membrane finish on roofs
  • Parapets
  • External surfaces exposed to constant weather
  • Roofs to be covered with screeds or toppings
  • Internal wet areas (bathrooms, laundries, tiled areas)
  • Balconies, decks, podiums, terrace floors
  • General tiled areas for moisture prevention


  • Provides a robust, long-lasting waterproofing barrier
  • Withstands harsh weather conditions and UV exposure
  • Maintains flexibility and integrity in challenging environments
  • Suitable for both internal and external applications
  • Resists water ponding and remains effective in permanently wet conditions
  • Prevents moisture ingress and protects against leaks
  • Compatible with various substrates and finishes
  • Safe and easy to apply

Application Guide:

  1. Surface Preparation: Ensure surfaces are structurally sound, smooth, stable, dry, and clean. Repair any defects and remove contaminants.
  2. Priming: Apply the appropriate Gripset primer to the entire surface. Allow drying as per primer instructions.
  3. Detailing: Seal critical areas (joints, junctions, penetrations, etc.) using Gripset SB sealant and Gripset RF reinforcement or Elastoproof products.
  4. Membrane Application: Apply Gripset P39 in a minimum of 2 coats (3 coats for optimal roof sealing) to achieve the required dry film thickness. Apply subsequent coats in different directions. Allow 24 hours drying time before tiling or applying toppings.


  • Do not apply in imminent rain or when surface temperature is below 5°C or above 30°C.
  • Not suitable for glass or glazed surfaces.
  • Not designed as a sealant for expansion or control joints.
  • Not for use in areas with solvent or petroleum spills or negative hydrostatic pressure.
  • Use only solvent-free finish coatings over the membrane.

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