GRP Roofing Swindon
GRP roofing — glass reinforced polyester, commonly known as fibreglass roofing — is one of the most durable and seamless flat roofing systems available for homes and commercial properties across Swindon and Wiltshire. Applied as a liquid and cured to a hard, rigid surface, GRP creates a completely waterproof shell with no joins or seams — eliminating one of the most common failure points on traditional flat roofing systems.
At Flat Roof Swindon, we install GRP fibreglass roofing systems to manufacturer specifications, with lifespans of 25–40 years and excellent resistance to foot traffic, UV exposure, and the wet conditions that Wiltshire winters regularly bring.
Why GRP Roofing Works Well in Swindon
GRP is particularly well suited to roofs with complex details — upstands, outlets, abutments, and penetrations — where seamed membrane systems can be harder to make fully watertight. Across Swindon, we see strong demand for GRP on flat-roofed extensions in older properties in areas like Old Town and Wroughton, where period detailing and complex roof geometry make a seamless system the most reliable option. GRP is also a popular choice for dormer roofs, balconies, and roofs that require occasional foot access for maintenance.
Our GRP Roofing Installation Process
- Survey and preparation — We inspect the existing deck for rot, movement, and drainage falls. Any remedial work to the deck is identified and quoted before installation begins.
- Deck boarding — Marine-grade or specialist GRP decking boards are laid over the prepared deck to provide a smooth, stable substrate for the fibreglass system.
- GRP lamination — Fibreglass matting is laid onto the deck and saturated with polyester resin, which is rolled out to remove air bubbles and ensure full adhesion. The laminate is left to cure before topcoat is applied.
- Topcoat finish — A coloured gelcoat topcoat is applied to the cured laminate, providing the finished weatherproof surface and UV protection. Standard finish is light grey.
- Trims and inspection — GRP trims are fitted at all perimeter edges and abutments. The finished roof is inspected and signed off before we leave site.
GRP Roofing Costs in Swindon
GRP roofing typically costs £70–£100 per m² installed, including materials, labour, and standard deck preparation. As a guide:
- Garage roof (15–20 m²): £1,050–£2,000
- Small extension roof (20–30 m²): £1,400–£3,000
- Larger extension roof (30–50 m²): £2,100–£5,000
All prices are subject to survey. Deck repairs and additional boarding are quoted separately and discussed with you before any additional work proceeds.
Frequently Asked Questions
How long does GRP roofing last?
A correctly installed GRP fibreglass roof will typically last 25–40 years. The seamless nature of the system means there are no joins to fail over time, and the topcoat provides effective UV protection throughout the system’s lifespan. Many GRP installations come with manufacturer warranties of 20–25 years.
Is GRP roofing better than EPDM?
Both are excellent systems — the right choice depends on your roof. GRP is better suited to complex roof shapes with multiple details, balconies requiring foot access, and situations where a hard, rigid surface is preferable. EPDM is often more cost-effective on simple rectangular roofs with straightforward drainage. We will advise on the best system for your specific roof at survey stage.
Can GRP roofing be installed in winter?
GRP resin requires temperatures above approximately 5°C to cure correctly, and a dry surface is essential for adhesion. For this reason, GRP installation is generally best carried out between April and October. If your project is urgent in colder months, we will advise on the most appropriate system for the conditions.
Can GRP be applied over an existing roof?
In most cases we recommend a full strip-off to inspect the deck before installing GRP. Because GRP bonds directly to the substrate, any moisture or instability in the existing deck will compromise the installation. We assess this carefully at survey stage and will always recommend the approach that gives the longest-lasting result.
Areas We Serve
We install GRP roofing across Swindon and the surrounding area, including Chippenham, Royal Wootton Bassett, Devizes, and Marlborough. If you are outside these areas, get in touch — we cover most of Wiltshire.
Get a Free Quote Today
We provide free, no-obligation written quotes for all GRP roofing projects across Swindon and Wiltshire. For independent guidance on fibreglass roofing standards and contractor selection, visit the National Federation of Roofing Contractors. Call us today to arrange a survey.