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Glass Reinforced Plastic (GRP) — commonly known as fibreglass — is a high-performance composite material widely used in roofing, construction, and manufacturing.
If you’re considering a GRP roofing system, this guide explains what it is, how it works, and why it’s one of the most durable flat roofing solutions available today.
GRP (Glass Reinforced Plastic) is made by combining:
When bonded together, these materials create a strong, lightweight, waterproof surface that is highly resistant to:
Key benefit: GRP can be moulded into complex shapes, making it ideal for flat roofs and detailed installations.
GRP has been used in the UK and Ireland since the 1940s, originally in the marine industry for boat building. Its proven durability quickly led to adoption across:
Today, fibreglass roofing systems are widely used for both residential and commercial flat roofs thanks to their:
A GRP roof is a single-ply laminate system installed over OSB3 decking boards.
When installed correctly, the result is a fully bonded, seamless surface that will not rot, crack, or corrode.
Here’s why contractors and homeowners choose fibreglass roofs:
GRP roofs typically last 20–30 years or more with minimal maintenance.
No seams = no weak points for leaks.
Once cured, GRP is inert, meaning:
Suitable for:
To ensure a successful installation, follow these essential guidelines:
Proper conditions are critical for curing and long-term performance.
Tip: Stagger board joints to improve strength and stability.
GRP trims provide a clean, watertight finish.
Apply resin:
Use:
The fibreglass should appear fully transparent when saturated.
This final layer provides weather protection.
A professionally installed GRP roof will last:
20–30 years or more
Factors that impact lifespan:
GRP is ideal if you want:
Our technical team is here to help with:
Contact us today for expert guidance on your GRP roofing project.
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