Flat roofs on extensions, garages and outbuildings need the right system to perform long-term. We install and repair flat roofs across Diss using GRP fibreglass, EPDM rubber and built-up felt systems. Every installation is correctly detailed for drainage and comes with a written guarantee.
Image: local flat roofing
Flat roofs are common on rear extensions, bay windows, garages, and single-storey outbuildings across Diss and the surrounding area. When they're specified and installed correctly, a modern flat roof will last twenty-five years or more without intervention. The problems most people associate with flat roofs — ponding water, blisters, and persistent leaks — are almost always the result of poor original installation or an outdated felt system that has reached the end of its life.
We install three main flat roofing systems depending on the application. GRP fibreglass is ideal for most residential extensions and garage roofs — it's fully seamless, highly durable, and handles foot traffic well for maintenance access. EPDM rubber membrane suits larger flat areas and is particularly good on roofs with complex detailing or multiple penetrations. We also carry out repairs and replacements on traditional built-up felt roofs, though for any roof showing persistent problems we'll normally recommend upgrading to GRP or EPDM rather than re-felting.
Proper flat roof installation is about drainage as much as the membrane itself. Falls need to be designed in — typically a minimum of 1:80 — and outlets positioned correctly so water clears the surface quickly. A flat roof with standing water after every shower is working against itself and shortening its own life.
We survey every flat roof before quoting, measure the falls, inspect the deck condition, and check upstand heights around parapets and abutments. Most residential flat roof replacements in Diss take one to three days depending on size. We provide a written guarantee of twenty years on GRP installations and fifteen years on EPDM.
Flat roof replacement in Diss typically costs between £70 and £120 per square metre for GRP fibreglass, including removal of the old covering and making good the 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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