Gloucester's damper Severn Valley microclimate demands flat roofing systems specified for high moisture exposure. GRP fibreglass and EPDM rubber are our primary systems across GL1 and GL2. Free surveys and written quotes with no call-out fee.
Flat roofs on rear extensions, garages and outbuildings across Gloucester have a harder life than those in drier locations. The city's low-lying position and proximity to the Severn creates ambient humidity that degrades felt systems faster and demands higher-spec waterproofing on new installations.
Our primary recommendation for Gloucester's high-humidity environment. Seamless GRP with 25+ year design life, zero maintenance required. Ideal for garages and rear extensions on Gloucester estates. From £80/m².
Get a Quote →Highly flexible rubber membrane ideal for larger flat roofs and those with irregular geometry. Handles moisture cycling and temperature variation well. Excellent choice for Gloucester's Severn Vale conditions. From £70/m².
Get a Quote →Replacing failed felt systems with modern GRP or EPDM. We strip to deck, inspect and replace boarding where necessary, then install a permanent waterproofing system. End-of-life felt replacement on a standard Gloucester garage from £900.
Get a Quote →Blistering, split seams, failed upstands or failed parapet flashings on existing flat roofs. We carry out targeted repairs where the membrane is otherwise sound. From £150 for localised repairs. Free condition assessment included.
Get a Quote →The post-war housing estates across western Gloucester — Kingsway, Abbeydale, White City — contain large numbers of flat-roofed garages and rear extensions from the 1960s and 1970s. Original felt systems on these structures are broadly at end of life, and the humid Severn Valley climate accelerates felt degradation. GRP or EPDM replacement on a standard garage roof in this area typically costs £800–£1,400.
Victorian terraces in the Westgate and Barton areas often have flat-roofed rear additions, some original and some modern extensions. Water management is critical in these high-density terraces — poor flat roof drainage on one property affects adjoining properties. We install GRP systems on these terraces with particular attention to perimeter upstands and parapet junctions.
"GRP flat roof on our garage to replace failed felt that had been leaking for two years. Strip, new OSB, GRP installed in one day. Completely watertight and under ten-year guarantee. Should have done it years ago."
"Rear extension flat roof replaced with EPDM on our Victorian terrace. Old felt had been patched twice before. New EPDM properly dressed at the parapet and junction with the house wall. No leaks through two wet winters since."
"GRP on two flat-roofed garages on the estate. Good value for two roofs done at the same time. Tidy installation, correct upstand heights, perimeter trim well finished. Both roofs performing well after a very wet autumn."
GRP fibreglass flat roofing in Gloucester typically costs £80–£110/m² installed. A standard single garage (15m²) costs £1,200–£1,650. EPDM rubber costs £70–£95/m² — a standard garage around £1,050–£1,400. Full felt replacement including stripping and boarding check adds £100–£200 to these figures. We provide free surveys and exact quotes.
For Gloucester's Severn Valley humidity, GRP fibreglass is our primary recommendation — seamless, rigid, and unaffected by the elevated moisture levels in the ambient air. EPDM is an excellent alternative for larger roofs or where GRP installation geometry is complex. Both significantly outperform felt in Gloucester's conditions.
GRP fibreglass flat roofs have a design life of 25–30 years in Gloucester conditions. EPDM rubber 25–30 years. Modern torched-on felt systems 15–20 years. Original cold-applied felt from the 1960s–70s (common on Gloucester estates) has long exceeded its design life if still in situ.
Yes. We always assess whether repair is viable before recommending replacement. If a flat roof membrane is sound but has a localised failure at an upstand, flashing or seam, targeted repair at £150–£350 is the right answer. We do not recommend replacement unless the membrane has reached end of life or failure is widespread.
Yes. Our Gloucester surveys are free with no obligation — you receive a written condition report and quote. Call 0124 235 2251.
All our work in Gloucester carries a 10-year written workmanship guarantee. We are NFRC registered with £5m public liability insurance.
We respond to Gloucester same-day for emergencies and typically within 2–5 days for planned work, from our Cheltenham base with no call-out surcharge.
No call-out fee. No obligation. Local roofers covering Gloucester and all surrounding Gloucestershire areas.
0124 235 2251