GMG Roof Experts, the leading roofing company in London, offers top-tier roofing solutions tailored to your specific needs.
GMG Roof Experts install and repair EPDM rubber flat roofs across the whole London Borough of Hillingdon. We strip the tired felt back to the deck, renew any soft boarding, set the falls so water clears, and bond a single sheet of EPDM rubber membrane over the whole roof with metal trims to the edges, bonded outlets and dressed upstands. Garage roofs, single-storey extensions, dormers, bay window roofs, porches and small commercial flat roofs, from a new rubber roof on an outbuilding to a repair on a split membrane, all from our Hayes UB3 base across Uxbridge, Hayes, Ruislip, Ickenham, Northwood and every postcode in between.
The background
Most flat roofs on Hillingdon homes are on garages, single-storey extensions, dormers and bay windows, and most were originally covered in built-up felt. Felt has a hard life on a flat roof. It goes brittle in the sun, blisters and splits along the laps, and once it lets go the water sits on the deck and rots the boarding underneath.
The other common fault is water that never drains. If the roof was laid dead level, or the firrings have sagged, rain ponds in the low spots, sits there between showers and works at every weak point until it finds a way through. A felt patch over a ponding roof buys a season at best.
EPDM rubber is a single-ply synthetic membrane that answers both problems. On most domestic roofs it goes down in one sheet, so there are few or no seams across the field to fail, and it is flexible enough to move with the building through hot and cold weather without cracking. Laid over a sound deck with the falls put right, it is a long-lasting flat roof covering with very little to go wrong.
We are based in Hayes, we lay and repair EPDM roofs across Hillingdon every week, and we always sort the deck and the falls first, because a rubber roof over a rotten deck or a ponding fall is still a roof that leaks.
What we do
From a new rubber roof on a garage to a repair on a split membrane, every job below is carried out by our own team, not subcontracted out, and every one starts with a close-up inspection and a written quote on request.
Stripping the old covering back to the deck, renewing soft boarding, correcting the falls and bonding a single sheet of EPDM rubber membrane over the whole roof.
The most common EPDM job. A tired felt garage roof stripped and re-covered in one sheet of rubber, with the edges trimmed and the water taken to a proper outlet.
EPDM dressed in one piece around rooflight kerbs, tight upstands and wall abutments, so the awkward junctions that fail in felt are covered without a seam.
Splits and punctures patched with primed EPDM, lifted edges and trims re-bonded, failed upstands re-dressed, and ponding sorted by adding firrings under a new local area.
Where a cold flat roof is being re-covered anyway, building it back up as a warm roof with insulation under the membrane, so the deck stays warm and dry.
The details that decide whether a flat roof lasts: drip and kerb trims, bonded rainwater outlets, and lead or EPDM flashing where the roof meets a wall.
An EPDM installation starts with getting the deck right, because the membrane is only as good as what it is bonded to. We strip the old covering back to the boarding, cut out and renew anything soft or delaminated, and check the falls. If the roof ponds, we add tapered firrings so water actually clears to the outlet rather than sitting in the middle.
With a sound, dry, swept deck, the EPDM goes down. On most domestic roofs that is a single sheet cut to size, relaxed, then bonded with contact adhesive across the field and fully bonded at the perimeter and up every upstand. The edges are finished with aluminium trims, the outlet is a bonded unit taken into the gutter or hopper, and the wall abutments are flashed and dressed in. Corners are formed from the sheet, not cobbled together with tape.
How it works
The process is the same whether it is a new garage roof or a membrane repair, and it starts with a conversation, not a sales pitch.
Call 07949 999411 or use the contact form. Tell us what the roof covers, where it is leaking if it is, and roughly where the property is in Hillingdon.
We get up onto the roof, check the deck, the falls and the upstands, and send a written quote covering deck repairs, membrane, trims, outlet and access, with a repair option where one is realistic.
We set up tower or scaffold access as needed, strip the old covering, renew any soft deck and correct the falls before the membrane goes anywhere near it.
We bond the EPDM, fit the trims, outlet and flashings, test the roof, clear up and take the waste away, and give you a written summary with photographs of the finished roof.
The build
An EPDM roof is a system, not just a sheet of rubber. Each part does a job, and the ones that get skimped, the deck, the falls, the trims and the outlet, are exactly the ones that decide whether the roof lasts. We build all four properly and set them out in the written quote so you can see what you are paying for.
On most domestic roofs the membrane itself is a single piece with few or no seams across the field, which is the main reason EPDM outlasts built-up felt on the same building.
Soft or delaminated boards cut out and renewed in exterior-grade ply or OSB3, and tapered firrings added where the roof needs a fall.
EPDM cut to size, relaxed, then bonded with contact adhesive. One sheet on most roofs, so few or no field seams to fail.
Aluminium drip, gutter and kerb trims to the perimeter, upstands fully bonded and dressed to the wall, and corners formed from the sheet.
Bonded rainwater outlets taken into the gutter or hopper, and lead or EPDM flashings where the roof meets a wall or a rooflight kerb.
A well-laid EPDM roof has very little to go wrong, but the ones that were rushed, or laid over a bad deck, fail in predictable places. A split or puncture from a dropped tool or foot traffic, an edge trim that has lifted and is letting water track back under the sheet, an upstand that was never bonded properly, or a low spot that ponds because the falls were wrong.
Most of these are a genuine repair rather than a re-roof. We clean and prime the area, patch splits with bonded EPDM, re-secure lifted trims and edges, and re-dress upstands that have pulled away. Where a roof ponds we can lift a local area, pack the fall with firrings and re-bond. What we will not do is patch a membrane that has reached the end of its life and call it fixed, we will tell you straight if a re-cover is the better spend.
Built-up felt has covered flat roofs for decades and a well-laid felt roof still does a job, but it has known weaknesses. It is laid in overlapping layers, so every lap is a potential leak, it goes brittle and cracks in UV over time, and it does not move well with a building that expands and contracts.
EPDM answers those points. On most domestic roofs it is a single sheet, so there are few or no field laps to fail. It stays flexible across a wide temperature range, so it moves with the building instead of cracking. It is stable in UV and ozone, and a repair, if one is ever needed, is a simple bonded patch. Over a sound deck with proper falls, it is a low-maintenance flat roof that should be left alone for a long time.
Completed work
Every image below is a real GMG Roof Experts photograph taken from the company's own site. Each one appears once, and the caption names the type of work where it could be confirmed from the source.
EPDM rubber flat roofing is a defined part of what we do from our Hayes base, inside the borough, from a new garage roof to a membrane repair. That means we turn up with the right access, sort the deck and the falls first, and bond a single sheet with the trims, outlet and upstands detailed properly.
Our work runs from patching a split on a sound roof to a full strip, deck renewal and single-sheet re-cover. We are CITB certified, fully insured, and there is no torch or hot works with EPDM, we bond it, and every job ends with a written summary and photographs of the finished roof.
Areas we cover
We cover the whole borough and the areas that border it. Each town below has its own location page with more local detail. If your postcode starts with UB3, UB4, UB7, UB8, UB9, UB10, HA4, HA5, HA6, SL0, SL9 or SL2, we can help.
Extension and outrigger flat roofs on Victorian and Edwardian terraces, with old felt failed at the wall abutment.
Roofers in Uxbridge →Our home patch. Garage and extension roofs with split felt and ponding, re-covered in single-sheet EPDM.
Roofers in Hayes →1930s semis with flat-roofed bay windows and rear additions, and detached garages needing a new rubber roof.
Roofers in Ruislip →Larger homes with dormer roofs, rooflight kerbs and extension roofs where EPDM is dressed in one piece.
Roofers in Ickenham →Large detached properties with flat-roofed link extensions, garden rooms and balconies over living space.
Roofers in Northwood →Iver, Gerrards Cross and Stoke Poges in Buckinghamshire, where extension and outbuilding flat roofs need a lasting re-cover.
Ask about your area →EPDM roofers near me
We cover every part of the borough for this work, not just the main towns, and our team is based in Hayes, so the person who inspects your flat roof is the person who scopes and prices the job.
GMG Roof Experts carries out new EPDM flat roofs, garage and outbuilding roofs, extension and dormer roofs, warm roof upgrades, EPDM repairs and all trims, outlets and flashings across Uxbridge, Hayes, Ruislip, Eastcote, Ickenham, Hillingdon village, Northwood, Yiewsley, West Drayton and Harefield, plus the bordering areas of Iver, Gerrards Cross and Stoke Poges. For a flat roof leaking into the room below we aim to attend a Hillingdon property the same or next working day.
Areas covered
Every area below is part of our regular coverage for this work. Where we have a dedicated location page, the pill links through to it.
Find us
GMG Roof Experts
30 Townfield Road, Hayes, UB3 2EP
Phone: +44 7949 999411
Email: info@gmgroofexperts.com
Hours: 24 hours a day, 7 days a week for emergency call-outs
Questions
The questions below come up most often from Hillingdon homeowners, landlords and businesses.
EPDM stands for ethylene propylene diene monomer, a synthetic rubber. As a roof covering it is a single-ply membrane bonded to the deck with contact adhesive. On most domestic flat roofs it goes down in one sheet, so there are few or no seams across the field to fail, and it stays flexible across a wide temperature range so it moves with the building instead of cracking.
Flat and low-pitch roofs: garages and outbuildings, single-storey extensions, dormer roofs and cheeks, bay window roofs, porches, balconies over living space and small commercial flat roofs. It is dressed in one piece around rooflight kerbs, upstands and wall abutments, which is where felt tends to fail.
For most flat roofs, yes. Built-up felt is laid in overlapping layers, so every lap is a potential leak, and it goes brittle in UV over time. EPDM on a domestic roof is usually a single sheet with few or no field laps, stays flexible, is stable in UV and ozone, and needs no torch or hot works to lay. Over a sound deck with proper falls it is low maintenance.
Not usually the whole deck. We strip the old covering, then cut out and renew only the boards that are soft or delaminated, commonly around the edges and the outlet. Where the roof ponds we add tapered firrings to correct the fall. A sound, dry, level deck is what makes the membrane last.
Usually, yes. Splits and punctures are cleaned, primed and patched with bonded EPDM, lifted trims and edges are re-secured, and upstands that have pulled off the wall are re-dressed. Ponding areas can be lifted locally, re-graded with firrings and re-bonded. If a membrane has genuinely reached the end of its life we will say so rather than patch it.
Ponding means the roof was laid dead level or the firrings have sagged, so water sits in the low spots instead of draining to the outlet. It matters because standing water works at every weak point and shortens the life of any covering. We correct the falls with tapered firrings as part of a re-cover so the water clears.
It is one of the cleaner flat roof systems to fit. There is no torch, no hot bitumen and no naked flame; the membrane is bonded with adhesive. Most garage and extension roofs are completed in a day or two once access is set up, weather permitting.
For maintenance access, yes, an EPDM roof takes occasional foot traffic. For a roof that will be used as a balcony or terrace, we build in a walkway or paving support layer over the membrane so the surface is protected and safe to use regularly.
We inspect the roof and the deck in person, then send a written quote covering deck repairs, membrane, trims, outlet, flashings and access. Where a repair is realistic we quote that too. All pricing is on request after that visit, because the deck condition, the roof size, the upstands and access are the biggest variables. We do not give figures without seeing the job.
We are based in Hayes and cover the whole London Borough of Hillingdon for EPDM rubber flat roofing, including Uxbridge, Hayes, Ruislip, Eastcote, Ickenham, Hillingdon village, Northwood, Yiewsley, West Drayton and Harefield, plus the bordering Buckinghamshire areas of Iver, Gerrards Cross and Stoke Poges. Call 07949 999411 to check your postcode.
Call now for a same-day response where the job allows it, or request a written quote following an inspection of the roof and the deck.
A written quote follows every inspection, we put the deck and the falls right first, and we bond a single sheet of EPDM with the trims, outlet and upstands detailed properly, whether it needs a repair or a full re-cover.
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GMG Roof Experts, 30 Townfield Road, Hayes, UB3 2EP. Email info@gmgroofexperts.com. EPDM rubber flat roofing, installation and repair across the London Borough of Hillingdon, including Uxbridge, Hayes, Ruislip, Eastcote, Ickenham, Hillingdon village, Northwood, Yiewsley, West Drayton and Harefield, plus bordering Iver, Gerrards Cross and Stoke Poges.