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Flat Roofing

GRP Flat Roofing Explained

Cold-applied, glass-reinforced polyester — and why it's the right call on most domestic flat roofs.

5 min read

GRP — glass-reinforced polyester — is the modern answer to small-format flat roofing. As a Topseal Approved Installer we deliver it on extensions, dormers, garages, parapets, conservatories and orangeries.

Cold-applied means safer site working

No torch, no naked flame — significant on residential refurbs and on terraced homes where fire risk to neighbouring properties has historically been the biggest concern with felt and bitumen.

25-year guarantee, 1,000+ finish options

Manufacturer-backed warranty as standard. A wide colour and finish palette lets you match the substrate or pick out the new roof as an architectural feature.

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Planning a roofing project?

Whether you're a homeowner, contractor, architect, developer or property manager — Horizon can help you assess the right roofing route.