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Roofing GRP Resins
GRP Resins are specialist liquid systems designed to form long-lasting fibreglass waterproofing solutions for flat and low-pitched roofs. Used in combination with chopped strand matting, these resins cure to create a tough, seamless, and fully bonded membrane. They are ideal for new builds and roofing systems alike, with suitability for domestic, commercial, and industrial settings. Common applications include extensions, dormers, garages, and balconies, as well as detailed areas like parapets, valleys, and box gutters.
Cromar PRO GRP Resin
Cromar PRO GRP Resin is a cold applied polyester resin designed specifically for Roofing Applications. Easy to form around complex situations, Pro GRP Resin is durable and able to resist foot traffic, an essential component in roofing systems. Very low styrene emission Low viscosity allowing rapid and efficient fibre wet-out Long pot life...
Bullet Roof GRP Roofing Resin
Bullet Roof GRP Roofing Resin is a high grade GRP pure and unblended resin, a long term, leak free and value for money system for flat roofs of any shape or size - from small porches to large domestic and commercial projects. GRP roofing technologies are extensively used for refurbishment or new roofs, by local authorities, architects, and...
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GRP Roof Resins for Fibreglass Flat Roofing – Long-Lasting Waterproof Solutions
GRP roof resins play a vital role in high-performance fibreglass roofing systems. When used correctly, they provide a seamless, monolithic layer that resists water ingress for decades. These resins chemically bond with reinforcement matting and compatible decking to form a rigid, waterproof laminate with no seams, joints, or adhesive failures. Unlike other flat roofing systems, GRP resins offer both structural reinforcement and weatherproofing in one.
A key advantage of GRP resins lies in their versatility and finish. The system easily adapts to complex shapes, upstands, roof lights, and edge details using pre-formed trims and flexible matting. This allows professional installers to cover even the most intricate areas without compromising strength. Topcoats are typically pigmented, allowing roofs to blend into their surroundings while providing protection from ultraviolet radiation. Once cured, the finish is hardwearing enough to accommodate light foot traffic and garden furniture when used on balconies or terraces.
These products are ideal for areas requiring long-term protection with minimal upkeep. They are commonly used on OSB3 board decking but may also be suitable for GRP-compatible ply. GRP resins should only be installed in dry conditions with mild temperatures, and users must adhere to curing and overcoating guidelines. PPE is essential, as the curing process generates heat and vapour, and correct ventilation is required. Choose complete GRP roofing kits, individual resin tins, topcoats, matting, and accessories. All items are intended for professional or competent use. For project-specific guidance, contact the technical team before starting application.
GRP Resin FAQs
Can GRP resins be used in cold or damp weather?
No. GRP products must be applied during dry weather with air and substrate temperatures typically above 5°C. Damp or cold conditions will prevent correct curing and lead to failure.
Is it possible to repair a damaged GRP roof?
Yes. GRP roofs can be abraded and patched using compatible resins and matting. Repairs must be applied to clean, dry, and sanded surfaces to bond properly.
Can GRP systems be applied over existing felt or asphalt?
No. GRP resins must be applied directly to compatible boards such as OSB3 or fibreglass-appropriate plywood. Existing coverings must be fully removed.
Do GRP roofs require a specific type of primer?
Primers are not normally required for standard GRP applications on new OSB3 decking. However, porous or uneven surfaces may need priming depending on the manufacturer’s instructions.