GRP Fibreglass Roofing in Worthing
Old felt roofs fail. GRP roofing doesn’t. If you’re replacing a failing flat roof on an extension, garage, balcony, or porch, GRP fibreglass is the smart choice. Seamless construction, UV resistance, flexibility, and a 40-year lifespan.
What is GRP Fibreglass Roofing?
GRP stands for Glass Reinforced Polyester — a composite material made of resin reinforced with glass fibres. When professionally installed, it’s laid as a seamless sheet (not multiple pieces joined with seams like EPDM or felt), creating a completely watertight membrane.
Here’s why that matters: seams are where flat roofs fail. Felt seams split in frost. EPDM seams can separate. GRP has no seams — it’s one continuous surface. Water has nowhere to get in.
GRP has been used in the UK for 30+ years with proven track records. It’s harder-wearing than EPDM, resists coastal salt spray and pollution better than felt, and looks cleaner longer. Most importantly, it lasts — guaranteed 30 years, often 40+ with minimal maintenance.
When Do You Need This Service?
- Replacing failed felt roof — old felt blistered, cracked, or leaking; GRP prevents another failure
- Extension or new flat roof — building work; GRP is worth the upfront cost for three decades of security
- Balcony or terrace waterproofing — high-durability requirement for areas you use regularly
- Garage or outbuilding roof — protecting valuable contents; GRP reliability is worth it
- Flat-roof bungalow requiring full roof replacement — GRP cost is recovered over 30 years
- Coastal exposure — salt air erodes felt and EPDM; GRP resists corrosion completely
Our Process
Structural Preparation & Assessment
We inspect the existing roof base for rot, deflection, or structural damage. GRP is heavy — we ensure joists can handle it. We remove old membrane and assess slope.
Design & Slope Optimization
We calculate proper drainage slope (minimum 1-in-50 gradient) to prevent ponding. Even seamless GRP needs slope to shed water effectively.
Base Layer Preparation
We prepare the substrate (timber, old concrete, or existing structure) and apply primer to ensure the resin bonds perfectly to the base.
GRP Lamination
We lay continuous GRP sheeting, overlapping edges, and apply multiple coats of resin and reinforcing fabric. Each layer is hand-applied and cured. This is craftsmanship — not a roll-and-tape job.
Flashing & Details
We install GRP-compatible flashings around pipes, vents, and upstands. Details are seamless rather than bolted flashings that leak.
Top Coat & Protection
We apply UV-protective top coat (white or coloured) that reflects sun, keeps the roof cooler, and extends lifespan. Appearance is clean and professional.
Inspection & Warranty
Full inspection against British Standards. 10-year workmanship guarantee. We provide maintenance advice (minimal — just annual inspection).
Materials We Use
Typical Cost Range
£3,500–6,000+ for typical extension
Exact pricing depends on your property. Get a free, no-obligation quote.
Frequently Asked Questions
What Our Customers Say
“We’d had a felt roof on our extension for 15 years and it was starting to fail. Jaysways quoted GRP and explained why the extra cost was worth it. Five years in and no issues whatsoever. The roof looks as clean as the day it went on.”
James & Helen R.
Worthing
Ready for GRP Fibreglass Roofing?
Get a free, no-obligation quote. We respond within 24 hours.