Seamless EPDM rubber roof on a garage in Royal Wootton Bassett

EPDM Rubber Roofing in Royal Wootton Bassett

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EPDM arrives as one continuous sheet of synthetic rubber, cut from a roll wide enough that most domestic roofs need no join anywhere across them. That single fact is the reason it has displaced felt on most garages, dormers and extensions in the SN4 area over the last fifteen years: the place a flat roof leaks is almost always a joint, and this system does not have any.

It goes down cold, with adhesive rather than a gas torch, which also makes it the sensible choice anywhere near a timber-framed structure or an attached garage.

Roofer bonding an EPDM membrane at a perimeter trim

What makes rubber different

No field joints

The membrane arrives cut to your roof. On anything up to a double garage there is typically not a single seam across the whole surface.

It moves with the building

EPDM stretches to several times its own length and returns. Thermal movement that opens a lap in felt does nothing to it.

Cold application

Bonded with adhesive, not flame. No hot works, no torch near a fascia or a soffit, no fire risk to the structure beneath.

Genuinely repairable

A puncture from a dropped aerial or a falling branch is patched permanently with the same material and adhesive.

Where it belongs, and where it doesn't

Rubber suits anything with a simple shape and light foot traffic — garages, single-storey rear extensions, dormer cheeks and tops, porches, bay roofs and outbuildings. On those it is difficult to justify anything else on cost per year of service.

It is a poorer choice where the roof will be walked on regularly, used as a balcony or terrace, or carries plant and equipment. The membrane is tough but it is not rigid, and a surface underfoot every day wants the hardness of fibreglass. It is also less suited to roofs cut about with pipes, upstands and awkward junctions, where a liquid-applied system will detail more cleanly than sheet material can.

The parts that actually fail

In fifteen years of these roofs coming back to us, the membrane itself has essentially never been the problem. What fails is everything around it: an edge trim that was omitted to save money, a perimeter bonded with the wrong adhesive, an outlet that was cut in without a purpose-made former, or a deck that was left damp under a new sheet.

So the specification that matters is unglamorous. A clean, dry, screwed-down deck, with new boards wherever the old ones are soft. Water-based adhesive across the field, contact adhesive at the perimeter and upstands, and proprietary trims at every gutter edge, kerb and abutment. Get those right and the roof becomes genuinely uneventful, which is the whole point of it.

Insulation and building regulations

Over habitable space, a rubber roof replacement is usually also an insulation upgrade whether you were planning one or not. Where you are replacing more than half the covering, building regulations expect the thermal performance to be brought up to current standards, which in practice means a warm-roof build-up: insulation boards above the deck, membrane above the insulation.

That raises the roof level slightly, which matters at door thresholds and where the roof meets a window above, and it is worth flagging at quote stage rather than discovering on day two. It also removes the condensation risk entirely, which on a kitchen or bathroom extension is worth as much as the heat saved.

Flat roofing overview

How EPDM compares against fibreglass and felt.

Roofers in Royal Wootton Bassett

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EPDM prices in Royal Wootton Bassett

RoofTypical price
Porch or small dormer£450 – £1,000
Single garage£1,400 – £2,200
Double garage£2,000 – £3,200
Rear extension, warm roof£2,500 – £4,800
New deck boards where needed, per m²£45 – £75

Edge trims and outlet details included. Deck repairs itemised after strip-up rather than assumed, because nobody honestly knows the state of the boards until the old covering is off.

Frequently asked questions

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