GRP Fibreglass Roofing: A Complete Guide

GRP (Glass Reinforced Plastic) fibreglass roofing has become the go-to system for domestic flat roof extensions in the UK. Its combination of durability, low maintenance, and attractive appearance makes it a popular choice among homeowners and builders alike.

How GRP Roofing Works

GRP roofing is applied as a liquid system. Fibreglass matting is laid on the roof deck and saturated with resin, which is then cured to create a rigid, seamless waterproof surface. A coloured topcoat is applied to finish and protect the surface. Because it's applied in liquid form, it bonds perfectly to the deck and there are no seams — reducing leak risk.

Advantages of GRP

• Seamless and rigid — no joints to fail
• Long lifespan — 25–40 years or more
• Available in any colour — blends with any property style
• Easily inspected — problems are immediately visible
• Walk-on surface — suitable for roof terraces with appropriate finish
• Cold-applied — can be installed in cooler temperatures

GRP for Roof Terraces

With a slip-resistant non-skid topcoat, GRP is an excellent choice for flat roof terraces and balconies. It can withstand regular foot traffic and is used widely in commercial settings.

GRP Maintenance

GRP roofs are low maintenance. An annual inspection, keeping drains clear, and occasional cleaning is all that's typically needed. Small chips or cracks can be repaired with GRP repair kits.