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Achieve instant, heavy-duty, and resilient waterproofing for subterranean and critical external structures. Safeguard against water ingress, structural movement, continuous ponding, and harsh environmental conditions. All without curing delays. This is the heavy-duty membrane that provides an immediate, reliable seal in demanding environments.
Gripset BRW HD is a self-adhesive butyl rubber sheet membrane engineered for subterranean waterproofing and multi-layered applications. It is designed to provide instant sealing with its high-tack butyl backing and a high-strength HDPE film facing. This combination ensures outstanding adhesion to both porous and non-porous surfaces across a wide temperature range. The membrane delivers a waterproofing system that resists vibration, movement, and flexing. This overcomes the common limitations of traditional bitumen self-tack and heat-applied sheet membranes. It forms an instant waterproof seal, eliminating drying or curing times, allowing for immediate service upon installation.
BRW HD offers a cold-lay, self-adhesive application, eliminating the need for torching, heat welding, or hazardous primers. This means no drying or curing time, providing an instant waterproof seal upon application. Prepare surfaces by ensuring they are clean, sound, smooth, and dry, removing any contaminants. Mechanically remove structurally unsound layers. Masonry surfaces require pointing flush and filling all defects. Concrete must cure for 28 days and screeds for 7 days.
Priming is generally required for porous/absorbent surfaces with Gripset GP Primer and non-porous/non-absorbent surfaces with Gripset OP Primer. For green or damp surfaces, or external floors, Gripset E60 is specified. Non-mineral based surfaces like metals and plastics typically do not require priming if suitably prepared.
Install by unrolling and cutting lengths, then slowly removing the release paper while pressing the sheet firmly onto the substrate with a flat trowel or roller. Ensure overlaps are properly sealed using the in-built sealing strip on sheet edges for vertical joints. For horizontal overlaps and end-of-roll connections, use BRW FG Tape to create a permanent seal. Detail pipes, penetrations, and floor wastes by cutting the membrane to fit and ensuring a tight, bonded seal. For perimeter detailing and internal/external corners, use BRW HD Tape, placing it centrally over the joint to create a bond breaker and additional protection.
Gripset BRW HD functions as the primary waterproofing membrane in demanding below-ground and external systems. In below-ground waterproofing, it is commonly applied after Everflex VBS, providing the main barrier against moisture before sealant work with products like Adheseal PU25. For external planter boxes, it acts as the initial heavy-duty layer, often followed by Gripset BRW-PF for enhanced, multi-layered protection. Its self-adhesive nature and instant seal facilitate rapid progression through project stages, minimising delays caused by curing times.
Gripset BRW HD stands apart from traditional bitumen self-tack and heat-applied membranes. It provides instant sealing without the need for torching, heat welding, or extended drying times. This eliminates the fire hazards associated with torch-applied systems and the application delays inherent in many liquid or bitumen-based products. Unlike bitumen products, BRW HD also avoids issues of 'bleed' or 'yellowing', ensuring a cleaner application without discolouration. For projects requiring multi-layered, high-performance systems, BRW HD integrates effectively with Gripset BRW-PFN, offering enhanced protection where continuous ponding water, structural movement, and vibration resistance are critical. This allows for a tailored approach to complex waterproofing challenges, leveraging the strengths of both products in a cohesive system.
Most porous and absorbent surfaces require a primer before applying Gripset BRW HD. Non-porous surfaces like metals, plastics, and glazed materials, when clean and sound, typically do not require priming. Always refer to the specific primer data sheets for full application details.
No, Gripset BRW HD is not designed for applications exposed to UV light. For applications requiring UV resistance or where the membrane will remain uncovered, a different product is needed. BRW HD is best suited for buried or covered applications like subterranean walls and under pedestal paver systems.
Its self-adhesive butyl rubber composition with an HDPE face creates an instant, high-bond waterproof and vapour barrier. It resists ground salts, chemical agents, and extreme temperatures from -30°C to 80°C, providing a durable solution for subterranean conditions. This minimises risk of water ingress and extends membrane life.
Yes, Gripset BRW HD is formulated to handle continuously ponding water. Its robust butyl rubber and HDPE construction ensures a reliable waterproof barrier in demanding applications such as planter boxes and roof gardens where water retention is expected.
| Application | Key benefit | Primary trades |
|---|---|---|
| Underground retaining walls & basement walls | Delivers an instant, robust waterproof and vapour barrier, resistant to ground salts and soil movement across -30°C to 80°C. | Civil contractors, Waterproofers |
| Planter boxes & roof gardens | Handles continuously ponding water without degradation, ensuring long-term integrity in critical landscaping areas. | Landscapers, Waterproofers |
| Plaza decks, podiums & terraces | Provides immediate waterproofing with no curing time required, accelerating project handover for unbonded screeds or under pedestal paver finishes. | Commercial builders, Waterproofers |
| Multi-layered high-performance systems | Forms a flexible, high-tear strength layer that resists vibration and flexing, enhancing system durability where movement is expected. | Waterproofers, Commercial builders |
Clean, sound, smooth and dry substrates. Remove contaminants and repair defects. Observe minimum cure times (concrete ~28 days; render/screed ~7 days).
Grind or abrasive blast to remove laitance, curing compounds and weak layers; point masonry flush.
Use E60 on green/damp surfaces (1–2 coats at ~1 L/3 m²/coat); remove standing water before priming.
Prime per substrate: GP Primer (~1 L/8–10 m²) for porous; OP Primer (~1 L/12 m²) for non-porous as needed; E60 for green/damp (1–2 coats at ~1 L/3 m²/coat).
Tack 100–200 mm while positioning, then unroll and remove release paper progressively. Press out air with a flat trowel/heavy roller; ensure firm pressure at edges and terminations.
Start from the lowest point near drains and work upslope so laps aid drainage.
Install in vertical patterns; ensure first run is straight. Where wall sheet overlaps floor sheet, maintain a minimum 150 mm overlap.
Use the in-built sealing strip for side laps. At end-of-roll joins use BRW FG Tape; overlap the sheet ~25 mm onto the tape and begin the next roll with a 300 mm overlap. For penetrations, cut and slide the sheet over, trim, then patch with BRW-HD sections or BRW-HD Tape where needed.
Use BRW FG Tape detail at base/horizontal terminations when no subsequent overlap occurs. Protect exposed vertical terminations (retaining/basement/planter walls) per Installation Manual.
Gripset BRW HD is classified as non-hazardous and non-dangerous goods. Always refer to the Safety Data Sheet (SDS) for complete safety information.
Wear safety shoes and gloves during handling and application. Ensure gloves are suitable for intermittent contact and regularly wash hands before eating, drinking, or smoking.
Natural ventilation is adequate under normal use conditions.
Store Gripset BRW HD in a cool, dry, well-ventilated area, out of direct sunlight and away from foodstuffs. Keep rolls upright and containers closed when not in use. Product is best used within 12 months of purchase. Dispose of material and containers according to local regulations.
Proper surface preparation and priming are critical for Gripset BRW HD to achieve maximum adhesion and performance. This guide outlines requirements for common substrates.
Surface prep: Surfaces must be sound, smooth, clean, and dry. Remove all loose material, dirt, dust, oil, grease, laitance, and curing compounds. Grind or abrasive blast structurally unsound layers. Point masonry flush and fill all voids, holes, and non-structural cracks. Concrete requires a minimum 28 days cure, and cement render/screeds a minimum 7 days cure.
Primer: Required. Use Gripset GP Primer at 1 litre per 8-10m² for porous surfaces. For damp surfaces or external floors, use Gripset E60 with 1-2 coats at 1 litre per 3m² per coat.
Surface prep: Ensure surfaces are clean, dry, sound, and free from contaminants. All sheeting must be securely fastened and fit for purpose.
Primer: Required. Use Gripset GP Primer at 1 litre per 8-10m².
Surface prep: Surfaces must be clean, sound, and free from any contaminants like oil, grease, wax residues, or release agents. Ensure surfaces are smooth and dry.
Primer: Not required. These non-porous, non-mineral based surfaces typically allow for primer-less application once suitably prepared.
| Property | Value |
|---|---|
| Colour/Material | Black HDPE face, Black butyl backing |
| Thickness | 1mm |
| Specific Weight | 1.55 g/cm³ |
| Tensile Strength | >3 MPa (AS 4654.1 Appendix A) |
| Elongation | <300% (AS1145.3) |
| Membrane Class | Class III |
| Water Vapour Transmission | 1 g/24h/m² (ASTM E96 Desiccant method) |
| Water Absorption | 2% (AS 3558.1) |
| Service Temperature | -30°C to 80°C |
| Compliance to AS4858 | PASS |
| Compliance to AS 4654.1 | PASS |
Here are some common examples on where Gripset BRW HD used by our customers.
