EPDM Rubber Roofing › Cwmbran › Guide
EPDM is a tough rubber membrane, but garages, porches and extension roofs in Cwmbran still get punctured by branches, tradespeople and foot traffic, or fail at an edge. The good news is that a sound membrane can usually be repaired. This guide explains how we find the fault and what the options are.
Finding where the water gets in
Water travels under a membrane before it shows inside, so the stain on the ceiling is rarely directly below the hole. We look at the roof surface, the edges, the upstands, the outlets and the junctions with walls. Most leaks on rubber roofs are at a detail, not in the middle of the sheet. Tracing the real source first avoids a patch in the wrong place. Sometimes we test sections with water, one at a time, to narrow it down.
Patches and cures on a sound membrane
A puncture or small tear is cleaned, dried and patched with matching EPDM and the right adhesive or cure tape, lapped well beyond the damage. That seals it without touching the rest of the roof. It suits a roof that is otherwise sound and well bonded, which includes plenty of small flat roofs on Cwmbran garages and porches that are not very old.
- Punctures and small tears patched with matching rubber
- Lifted or unbonded edges re-bonded to the deck
- Failed seams or joints cleaned and re-sealed
- Damaged corner details rebuilt by hand
When the problem is the detail, not the sheet
Failed upstands, lifting trims, loose edges and blocked outlets all let water in without the rubber itself being at fault. Repairs at these points often mean re-bonding, new sealant or a replaced trim. On extensions with a wall abutment, as on many semis around Pontnewydd, the junction with the house wall is the usual weak spot, so we look there early. Sealant alone rarely lasts there.
When repair is not the answer
If the deck is soft or the falls are wrong so water pools, patching treats the symptom. Where the membrane is widely perished, torn or losing its bond across the roof, a series of patches costs more in the end. We tell you straight when a roof needs replacing, and what the deck needs first, so you are not paying for repairs that will not hold.
What you can do and what to leave to us
From inside, check ceilings and walls for staining after rain, and from the ground look for pooling or a sagging roof edge. Keep off the roof yourself. Call us for a proper look. A repair can often be done quickly once the source is found, and we will say honestly whether a patch or a full re-lay is the better course.
Need epdm rubber roofing in Cwmbran? See our epdm rubber roofing in Cwmbran page, or call 07766 547309.
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Common Questions
What causes damage to an EPDM roof?
Mostly mechanical damage: falling branches, foot traffic, dropped tools, and failures at edges and upstands where movement or poor sealing opens a path. The sheet itself is tough, so the details are often the real weak point.
Can a hole be patched without replacing the roof?
Yes, on a sound membrane. The area is cleaned and dried, and a matching patch or cure is bonded over it with a generous lap. We also check the surrounding roof, so one leak is not hiding another.
How do I know whether to repair or replace?
If the damage is local and the membrane and deck are otherwise sound, repair is sensible. If it is perished, widely lifting or the deck is soft, replacement is the better answer. We look and tell you honestly.
Get a Quote in Cwmbran
Tell us what the roof is doing in Cwmbran and we will look at it. Call 07766 547309, message us on WhatsApp or use the form below.