We provide specialist flat roofing across Royal Wootton Bassett — from the High Street conservation area to the modern estates at Templars Firs and Longleaze. Royal Wootton Bassett is 7 miles from our Swindon base, giving fast response times with the right expertise for local conditions.
We provide specialist flat roofing across Royal Wootton Bassett — from the High Street conservation area to the modern estates at Templars Firs and Longleaze. Royal Wootton Bassett is 7 miles from our Swindon base, giving fast response times with the right expertise for local conditions.
The 1970s–80s extensions across Templars Firs and Longleaze used three-layer bitumen felt over chipboard. Westerly rain corridor accelerates every failure mode — the felt cracks from thermal cycling, the chipboard swells from moisture, and the inadequate falls allow ponding that freezes in winter. Patching is temporary at best.
We lay all flat roofs to BS 6229 standard with minimum 1:40 falls. GRP provides a seamless, rigid membrane ideal for smaller roofs. EPDM offers flexibility for larger areas. Both carry manufacturer-backed guarantees of 20+ years. We recommend based on your specific roof geometry.
When stripping old flat roofs in Royal Wootton Bassett, we find chipboard deck failure on the majority of properties. We always replace with 18mm marine-grade plywood, check joist condition, and correct the falls before laying the new membrane. The deck is the foundation — get it right and the membrane will last its full design life.
Flat roofs in Royal Wootton Bassett face specific challenges from westerly rain corridor. The 1970s–80s rear extensions across Templars Firs and Longleaze have long exceeded their felt lifespan. Modern GRP and EPDM systems are the only lasting solution. We're just 7 miles away for fast survey and installation.
No call-out fees. Free quotes. 10-year guarantee. Call 0179 329 7084.
0179 329 7084"Kitchen extension had been leaking for two years. They stripped the old felt, replaced the chipboard, and laid GRP fibreglass. Two winters later — bone dry. Best money we've spent on the house."
"Garage roof was a mess. They recommended EPDM rubber for the larger area, fitted it in a day. Neat finish, 20-year guarantee. Very happy with the result."
"Dormer window flat roof was the source of years of damp. They found rotten timber underneath, replaced the deck and laid GRP. Finally properly sorted."
Porch/bay: £800–£1,500. Garage: £1,200–£2,500. Rear extension: £2,500–£5,000. We survey free and recommend the best system for your specific roof. Porch: £800–£1,500. Garage: £1,200–£2,500. Extension: £2,500–£5,000. GRP and EPDM both carry 25–30 year manufacturer guarantees. See our flat roof cost guide for detailed pricing.
GRP for smaller roofs and walkable areas — seamless and very durable. EPDM for larger areas — flexible and handles thermal movement well. Both carry 20+ year guarantees. GRP is seamless, rigid and walkable. EPDM is flexible and better for larger areas. Both massively outperform traditional felt. BS 6229:2018 specifies minimum 1:40 falls. See our GRP vs EPDM comparison.
GRP: 30+ years. EPDM: 25+ years. Both far outlast traditional felt which fails after 10–15 years. The right system with proper falls and ventilation will last decades. We always strip to deck, inspect joists, and build correct falls. No overlaying. Warm deck insulation specified as standard per Building Regulations. See our warm vs cold deck guide.
If the membrane has localised damage, possibly. If the felt is cracked or blistered across the surface, replacement is the only lasting fix. We advise honestly during the free survey. We always strip to deck, inspect joists, and build correct falls. No overlaying. Warm deck insulation specified as standard per Building Regulations. See our warm vs cold deck guide.
We always inspect the deck. If the chipboard has swelled or delaminated — common on older Royal Wootton Bassett flat roofs — we replace it with marine-grade plywood before laying the new membrane. We always strip to deck, inspect joists, and build correct falls. No overlaying. Warm deck insulation specified as standard per Building Regulations. See our warm vs cold deck guide.
Yes — inadequate ventilation causes condensation that rots the deck from underneath. We always check and upgrade ventilation when fitting new flat roofs. We always strip to deck, inspect joists, and build correct falls. No overlaying. Warm deck insulation specified as standard per Building Regulations. See our warm vs cold deck guide.
Manufacturer-backed guarantees of 20–25 years on both GRP and EPDM, plus our 10-year workmanship guarantee. We always strip to deck, inspect joists, and build correct falls. No overlaying. Warm deck insulation specified as standard per Building Regulations. See our warm vs cold deck guide.
Royal Wootton Bassett sits in a shallow vale directly in the path of Atlantic weather systems funnelling along the M4 corridor from the Bristol Channel. The town receives measurably more westerly rainfall than Swindon, making chimney pointing failure and flat roof deterioration more severe. The Templars Firs and Longleaze estates from the 1980s-90s are seeing widespread flat roof failure on original rear extensions.
We strip the old membrane completely, inspect the deck (replacing rotten chipboard with marine-grade plywood where needed), build proper falls using tapered firring strips to ensure positive drainage, install ventilation to prevent condensation, and lay the new GRP or EPDM membrane with mechanical edge trims and proper upstand detailing. Most domestic flat roofs are completed in 1-2 days.
We are NFRC registered, carry £5m public liability insurance, and provide a written 10-year workmanship guarantee on every job. We know Royal Wootton Bassett's housing stock, its specific climate challenges, and the materials that work best in local conditions. We do not subcontract — our own team handles every job from survey to completion. Call 0179 329 7084 for a free quote.
Traditional three-layer bitumen felt was designed for a 15 to 20 year lifespan. In practice, the felt cracks from thermal cycling, the laps separate as adhesive degrades, and the chipboard deck underneath swells from moisture ingress. Swindon conditions accelerate every stage. The plateau creates wider daily temperature swings than in valley towns, causing more expansion and contraction. Freeze-thaw cycling in winter forces ice into every hairline crack. And the exposed position means more wind uplift stress on membrane edges. Patching these roofs is a temporary measure — the membrane is failing across its entire surface.
We lay all flat roofs to BS 6229 standard with a minimum fall of 1 in 40 using tapered firring strips over the deck. The deck is always marine-grade plywood — never chipboard, which swells when it gets wet. We install tile or slot vents for continuous airflow to prevent condensation. Edge trims are mechanically fixed at 200mm centres. Upstands are formed to a minimum height of 150mm above the finished surface. These details are what separates a flat roof that lasts 30 years from one that fails in 10.
We strip the existing membrane completely — we never overlay new material on top of old. We inspect every board of the deck, replacing any chipboard, OSB or plywood that shows moisture damage, delamination or structural weakness. All replacement decking is 18mm WBP marine-grade plywood. We build falls using tapered firring strips to achieve a minimum 1:40 gradient to the outlet — standing water is the number one killer of flat roofs and correct falls eliminate it. Edge trims are mechanically fixed at 200mm centres with stainless steel screws. Upstands are formed to a minimum 150mm above the finished roof surface. We install ventilation to prevent condensation in the void.
A well-installed GRP or EPDM flat roof needs minimal maintenance, but a few simple steps will maximise its lifespan. Keep the surface clear of debris — leaves, moss and dirt can block drainage outlets and cause ponding. Check the edges and upstands annually for any lifting or separation, particularly after winter. Inspect the outlet and ensure it is flowing freely after heavy rain. Do not place heavy items on the surface without load-spreading boards. Do not use a pressure washer on EPDM — it can damage the rubber surface. For GRP, avoid dragging furniture or ladders across the surface — the resin coat can be scratched. If you notice any damage, call us early — a small patch repair costs a fraction of the damage that water ingress will cause if left untreated.
The westerly rain corridor through Royal Wootton Bassett means we specify enhanced waterproofing on all west-facing elevations. Chimney pointing uses weather-struck joints for maximum rain shedding. Lead flashings get additional cover width on the prevailing weather face. Guttering capacity is assessed against the higher rainfall volume this town receives compared to Swindon.
From £150, no call-out fee.
More →Full re-roofs, 10yr guarantee.
More →GRP/EPDM, 25yr guarantees.
More →Same-day 24/7 response.
Call Now →Cleaning, repairs, replacement.
More →Repointing, flashings, stacks.
More →Biocide, 3-5yr protection.
More →uPVC roofline, ventilation.
More →Fitted to your roof.
More →Code 4 flashings, valleys.
More →Repair, matching, re-roofing.
More →Surveys from £120, fee credited.
More →Here is how to tell if this is the right service for your property.
When it is not the answer: If membrane is flexible, deck firm, and leak is from one point, a £200-£400 patch may give years more service.
Check membrane, deck, falls, upstands, outlet.
GRP and EPDM options, itemised.
Strip, new deck, firring strips for falls, membrane, trims, upstands.
10-year workmanship + 25-30yr manufacturer warranty.
| Job | Duration |
|---|---|
| Porch/bay | 1 day |
| Garage | 1-2 days |
| Extension | 2-3 days |
Weather dependent.
Ladder access for most. Scaffold for first-floor flat roofs.
Mix of period High Street properties and post-war estates. Conservation area on the High Street. Pavement scaffold and skip permits go through Swindon Borough Council; allow a few working days on streets like High Street, Station Road, Coped Hall.
Workmanship 10 years. System warranty 25-30 years.
2-3 days. GRP resin odour during cure — close windows below for a few hours.
GRP needs dry conditions and 5°C+. EPDM more tolerant. Sheltered position relative to Swindon but still on the plateau fringe.
Last updated: August 2026
No call-out fees. No obligation. Local Royal Wootton Bassett roofers you can trust.
0179 329 7084