Achieve rapid project completion and high-performance waterproofing in covered internal and external areas. Gripset 38FC delivers this with a next-generation, fast-curing, fibre-reinforced SBR latex liquid membrane, engineered for reliability where time and performance are critical.

Why this product exists

Gripset 38FC was formulated as a next-generation solution for waterproofing applications that demand both speed and high performance. It specifically targets internal and external areas that will be covered by toppings, tile beds, or overlay finishes. Its fibre-reinforced SBR latex chemistry delivers rapid turnaround times for domestic and commercial projects, addressing the need for quicker project completion without compromising waterproofing integrity.

The numbers that matter

  • Tiling in 4 hours, flood test in 24 hours: This fast cure technology significantly reduces project delays. It allows for tiling or topping application the same day, getting trades back on site quicker.
  • >300% Class III elongation: This high flexibility rating means the membrane can stretch and recover with normal substrate movement. It bridges cracks up to 1mm, preventing leaks caused by building shifts.
  • Low water vapour transmission (0.6g/m²/24 hours): When installed as a liquid vapour barrier, this property prevents moisture vapour from migrating upwards. This protects adhesives and floor finishes from blistering and debonding.
  • Minimum 1mm dry film thickness: Applied in two coats, this ensures a robust, seamless waterproofing layer. It provides consistent protection against water ingress in continuously wet environments.

What it's like to use

Gripset 38FC is a viscous, blue liquid applied by brush or medium nap roller. Surfaces must be clean, sound, and primed first. For porous surfaces, use Gripset GP Primer. For non-porous substrates, Gripset OP Primer is recommended. Apply a minimum of two coats, ensuring each coat is applied in a different direction to the previous. Once dried, clean tools with water. Dried material requires mechanical removal.

For critical areas like joints, junctions, and penetrations, detailing with products like Elastoproof B50 Joint Band or BRW PF Tape and RLA MAX SMP 25 sealant is essential before membrane application.

Where this product excels

  • Covered balconies, podiums, door/window reveals, and flashings: It provides a flexible, fast-curing membrane that can be quickly covered with screeds, toppings, or tiles. Its fibre reinforcement enhances durability in these demanding external areas.
  • Internal wet areas, including bathrooms, laundries, and kitchens: The rapid recoat and tiling times significantly accelerate project schedules. This reduces overall construction time for both residential and commercial fit-outs.
  • Rooftop terraces under screeds and toppings: Acts as an effective liquid vapour barrier. This protects the overlying finishes from moisture migration, preventing issues like blistering or debonding.
  • Sandwich membrane between concrete substrates: It accommodates structural movement and prevents water ingress between concrete pours. This ensures long-term integrity in civil construction applications.

How it fits in a real system

Gripset 38FC often serves as a primary liquid membrane layer in complex waterproofing systems. In balcony and deck applications, it frequently follows the installation of prefabricated waterproofing corners for critical junctions. It also integrates into comprehensive internal wet area systems, typically applied after initial primers like Gripset GP Primer and other components such as Gripset BRW PF sheet membranes. Its position in the sequence allows for seamless integration and robust waterproofing.

Choose this when

  • When rapid project completion is critical: Its fast cure allows tiling or topping within 4 hours, and flood testing after 24 hours.
  • When waterproofing covered internal or external wet areas: This includes bathrooms, laundries, balconies, and rooftops that will receive an overlay finish.
  • When a flexible, fibre-reinforced membrane is needed: Its Class III elongation provides crack-bridging capabilities for normal substrate movement.
  • When a liquid vapour barrier is required: Use between toppings and slabs to prevent moisture-related issues with floor finishes.

Don't use this when

  • Not for: direct UV exposure or trafficable surfaces. It requires protection from direct sunlight and foot traffic to perform long-term.
  • Not for: areas subject to rising damp or negative hydrostatic pressure. A different product designed for these specific conditions is required.
  • Not for: application outside of 5°C to 30°C. Temperature extremes compromise the membrane's curing and performance.
  • Not for: unprimed substrates. Proper priming is essential for adhesion and system integrity.

Compliance with AS 4858 and AS 4654.1 confirms its suitability for internal and external wet area waterproofing applications. These Australian Standards provide assurance of performance for Class III membranes under typical Australian building conditions.

Gripset 38FC vs. standard liquid membranes

Gripset 38FC stands apart from more general-purpose liquid membranes like Gripset 51 Waterproofing Membrane due to its next-generation formulation. It offers significant advantages with its fast-curing properties and fibre reinforcement, specifically designed for applications that will be covered by screeds or tiles. While standard membranes offer reliable waterproofing, Gripset 38FC accelerates project timelines and provides enhanced tensile strength for covered internal and external areas. It is not designed for exposed, trafficable, or direct UV-resistant finishes, where a different membrane choice would be more appropriate.