About GRP Fibreglass Roofing

GRP (glass reinforced plastic) fibreglass roofing is one of the most durable flat roof systems available, laid as a single seamless membrane with no joints or seams for water to find its way through. It's a popular choice for extensions, garages, dormers and balconies across Dorset, and typically comes with a long manufacturer-backed guarantee.

  • Fully seamless, joint-free waterproof membrane
  • Resistant to UV, ponding water and general weathering
  • Low maintenance once installed correctly
  • Wide colour range to match render, brick or trim
  • Strong, walkable surface suitable for balconies and roof terraces
GRP Fibreglass Roofing completed by KNJ Roofing in Dorset
Our Process

How We Approach GRP Fibreglass Roofing

  1. Roof deck is inspected and prepared, replacing any damaged timber

  2. A layer of marine plywood is fitted where needed for a solid base

  3. Fibreglass matting is laid and saturated with resin to form the waterproof layer

  4. A top coat and trims are applied for the finished, UV-stable surface

Other Services

Explore Our Other Flat Roofing Services

EPDM Rubber Roofing

A single-ply rubber membrane roof system known for flexibility and a long service life.

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Felt Roofing

Modern high-performance felt and torch-on systems for cost-effective flat roof waterproofing.

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Flat Roof Installation & Replacement

New flat roofs and full replacements for extensions, garages, dormers and commercial buildings.

Learn more →
Coverage

GRP Fibreglass Roofing Across Dorset

We carry out grp fibreglass roofing work throughout the following areas.

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