Flat roofs on extensions, garages, and bay windows need the right system to stay watertight. We install and repair flat roofs across Thetford using GRP fibreglass, EPDM rubber, and modern torch-on felt systems, all with long-term guarantees. If your existing flat roof is failing, we can survey it and advise on the best replacement option.
Image: local flat roofing
Flat roofing covers a broad range of situations — single-storey extensions, integral and detached garages, bay window tops, dormers, and low-pitched rear additions that are common on Thetford's interwar and post-war housing stock. The right material choice matters: a cheap torch-on felt job that fails in five years costs more over a decade than a GRP or EPDM system that carries a 20-year guarantee.
For most domestic flat roofs, we recommend either GRP fibreglass or EPDM single-ply rubber. GRP is laminated directly onto the decking and, when installed correctly, creates a fully seamless surface with no joins or laps to fail — it's particularly well suited to awkward shapes and roof lights. EPDM is a highly flexible rubber membrane that handles the movement and thermal expansion Norfolk's temperature swings cause, and it's an excellent choice for larger flat roofs over garages and extensions. For straightforward replacements where budget is a priority, a quality torched-on felt system with a mineral cap sheet remains a practical option. We'll explain the pros and cons of each during the survey.
Poor flat roofing is the single most common source of persistent water ingress in Thetford homes. Blistered felt, cracked lap joints, failed upstands at walls, and blocked outlets are all repairable in some cases, but a flat roof over 15 years old is usually more cost-effective to replace outright.
We survey the existing deck for rot and deterioration before quoting, replace any compromised sections of OSB or plywood, and install the new system in a single continuous visit where possible to avoid leaving the deck exposed. Flat roofs up to 25 square metres are usually completed within one to two days.
Flat roof replacement in Thetford typically costs between £70 and £120 per square metre fully installed, depending on the system chosen and the condition of the existing deck.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge — we aim to be on-site within 24 hours.
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