GRPFibreglass.
Glass-reinforced polyester roofing: a liquid resin reinforced with chopped-strand glass matting, applied wet over a plywood deck and cured into a single seamless shell. Walkable, tile-able, root-proof and good for 25+ years.
From £2,200
Price
2–4 days for typical 15–40 m²
Duration
20-year workmanship guarantee
Warranty
London-wide
Coverage
— Overview
What this service actually involves.
We strip back to deck, fit OSB3 or marine-ply roofing board to a true plane, then build up: a primer coat, a layer of catalysed polyester resin, chopped-strand glass matting consolidated with a paddle roller, then a topcoat in slate-grey or charcoal. Trims are pre-formed GRP corner and drip profiles bonded in. The cured surface is a single seamless laminate — no joints, no laps, no failure points.
— Signs you need this
4 things we look for first.
Planning to walk on the roof regularly (terrace, balcony, AC access)
Complex shape with lots of detail (no seams to fail)
Existing felt repeatedly patched and still leaking
Want a hard, ding-resistant surface — not soft like EPDM
— Included in the price
A fixed price means a fixed scope.
No hidden extras. Materials, access, disposal and a written guarantee are all in the headline number.
- Strip & dispose of existing covering
- New OSB3 / marine ply roofing board deck
- Pre-formed GRP corner & drip trims
- Catalysed polyester resin base coat
- 450g/m² chopped-strand glass matting
- Pigmented topcoat (slate-grey, charcoal, light grey)
- All upstands, outlets and abutments laminated in
- 20-year workmanship guarantee
— How we work
Step by step, fully transparent.
Strip & re-deck
Old covering off, new OSB3/ply screwed down to a true plane. GRP needs a flat, solid substrate.
Trims & primer
Drip and corner trims bonded around the perimeter. Resin primer rolled over the entire deck.
Lay-up
Resin applied, glass matting laid into it, paddle-rolled to wet out fully and remove every air bubble. Cures in 30–60 min.
Topcoat & cure
Pigmented topcoat applied across the entire surface. Full cure overnight. Walkable next day.
— Materials & kit
What we specify.
The unglamorous detail that decides whether the work lasts five years or twenty-five. Trade-grade or manufacturer-spec only — never builders' merchant own-brand.
- Cromar Pro 25 polyester roofing resin
- 450g/m² chopped-strand glass matting
- MEKP catalyst (hardener)
- Pre-formed GRP A-trim & B-trim drip profiles
- OSB3 18mm roofing board
- Acetone for tool cleaning & prep
— Why book with EG Roofing
The from £2,200 you see is the from £2,200 you pay.
Eight advantages built into every job — the things our customers tell us actually matter.
Fixed price, no surprises
Quoted before we arrive. Materials, access and disposal are all in the headline number.
Booked within the week
Most jobs scheduled within 5–10 working days. Same-week for active leaks.
20-year workmanship guarantee
Written workmanship guarantee on every job, lodged to your email after sign-off.
Before & after photos
WhatsApp photo sign-off before final payment — you see the work even if you're at the office.
12+ years on London roofs
Same two-roofer crews — never sub-contracted. Public liability cover £2m.
4.9★ on Google & Checkatrade
Hundreds of reviews from SW19, CR0, BR1, SE and Central London commercial.
Clean site, zero debris
Drives and borders sheeted, all waste taken away — skip only when the strip volume needs it.
One direct point of contact
WhatsApp the same roofer who quoted you — no call-centre, no chasing.
— Flexible payment
Spread the cost. Interest-free.
Pay how it suits you. Split the cost into 3 interest-free instalments with Klarna or Clearpay, settle by bank transfer on completion, or pay by card or cash. Your choice — we don't add a surcharge.
3 interest-free payments — first today, then every 30 days. Soft credit check, instant decision.
e.g. £2,200 → 3 × £733
4 fortnightly payments — pay over 6 weeks, no interest, no fees if paid on time.
e.g. £2,200 → 4 × £550
Card on completion
Tap, chip + PIN or contactless via Stripe terminal. Visa, Mastercard, Amex. Receipt by email.
Bank transfer or cash
Faster Payments on the day, or cash on completion. VAT receipt issued for landlords and small businesses.
Klarna and Clearpay are FCA-regulated payment providers. 18+, UK residents, subject to status. Missed payments may affect your ability to use these services. Full T&Cs at klarna.com and clearpay.co.uk.
— Frequently asked
4 answers before you book.
GRP vs EPDM — which is better?
GRP is harder, walkable, takes paving, repairable with the same materials. EPDM is more flexible, faster to install, seamless single-sheet. For terraces and balconies, GRP wins. For pure weather-cover on a flat extension, EPDM wins on warranty and labour cost.
Will it crack in cold weather?
Properly catalysed GRP on a stable deck does not crack. Cracking comes from a flexing substrate (sagging joists) or under-catalysed resin. We use OSB3/ply screwed down at 200mm centres and lab-calibrated catalyst ratios.
Can we walk on it straight away?
Light foot traffic next day. Heavy traffic (paving, decking, AC install) after 7 days for full cure. We can install on a rolling basis around your trade calendar.
What colour options?
Standard: slate-grey (most common), charcoal, light grey. Specials: any RAL on a 2-week lead time. We do not recommend white — yellows over 3–5 years.
— Free quote in 5 steps
Quote your grp fibreglass.
Five quick taps and it lands straight in our WhatsApp — same crew who'd do the job. From £2,200 · 2–4 days for typical 15–40 m².
— Free quote · 5 quick steps
Book grp fibreglass
Quote it.Booked this month.
From £2,200 · 2–4 days for typical 15–40 m² · 20-year workmanship guarantee. Klarna & Clearpay accepted.
— Often paired together
Related services.
EPDM Single-Ply Rubber
Firestone RubberCover — one seamless sheet, 25-year guarantee.
From £1,895 · 2–4 days for typical 20–40 m² extension
Torch-on Felt
Three-layer SBS-modified bitumen — the workhorse flat-roof system.
From £1,450 · 1–3 days for typical 15–35 m²
Leadwork & Valleys
Code 4 & 5 milled lead, welted joints — 50-year service life.
From £480 · 1–3 days depending on scope