If you need a flat roof installed or repaired in Feltwell, choosing the right contractor from the start will save you far more trouble than any other single decision you make.
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A flat roof is not simply a sheet of waterproofing material laid across a deck. The performance of the finished roof depends on the falls built into the structure, the quality of the substrate, the membrane or felt system chosen, and - critically - the detailing around edges, upstands, outlets and penetrations. Poor detailing at these junctions is the single most common cause of early flat roof failure, and it is almost always invisible once the job is finished.
At Brandon Roofers we install and repair flat roofs in Feltwell and the surrounding area using EPDM rubber systems and modern reinforced felt. Both materials significantly outperform the old-fashioned mineral felt that still sits on many homes built before the 1990s. EPDM in particular can last several decades when correctly installed because it is a single, flexible membrane with very few joints to fail.
Pitched roofs are more forgiving. If a tile slips or a ridge mortar cracks, the problem is usually visible and straightforward to fix. A flat roof that has been poorly installed can leak for months through a pinhole-sized failure in a hidden upstand, and by the time you notice damp inside the building the damage to the deck and ceiling below can be substantial.
This makes the contractor decision on a flat roof more consequential than almost any other roofing job. Yet many homeowners accept the first quote they receive, or choose purely on price, without asking the questions that would reveal whether the roofer actually understands flat roof systems.
The following questions are not a test - they are practical things every competent flat roofer should be able to answer clearly and without hesitation. If a contractor becomes defensive or vague, that is useful information.
A request for full payment upfront before work starts is a significant warning sign. A stage payment - something on commencement and the remainder on satisfactory completion - is more reasonable. Be equally cautious about quotes that are dramatically lower than others you have received; the savings are almost always made somewhere in the preparation or detailing that you will not see.
Pressure to decide on the same day is another flag. A legitimate contractor has enough work that they can allow you time to compare quotes and think clearly. Anyone who tells you the price is only valid today is using a sales tactic, not giving you a professional service.
Check that the contractor is willing to put the scope of work in writing before you agree. A written description of what is included - materials, system, dimensions, any deck repair allowance - gives you something to refer back to if disputes arise later.
EPDM rubber has become the preferred system for domestic flat roofs on extensions, garages and outbuildings. It is installed as a single large sheet with very few seams, which reduces the number of potential failure points. It handles thermal movement well - important on a south-facing roof that gets warm in summer - and it bonds cleanly to upstands with the correct adhesive system.
Modern torch-on felt (also called SBS modified felt) is a multi-layer system applied with a gas torch. When correctly installed it performs well, but it requires careful workmanship on the details and should only be applied by someone with proper torch-on experience. The risk of fire during installation on a timber deck is real if the operative is not experienced.
The old three-layer mineral felt that was standard until the 1990s has a typical lifespan of ten to fifteen years at best, and often less. If you have a felt roof of that age, it is approaching replacement rather than repair territory regardless of how it looks from the ground.
Before any membrane goes down, the deck should be inspected and any soft or rotten boards replaced. The falls should be checked and, if necessary, tapered insulation used to create the correct drainage gradient. Insulation fitted correctly above or below the deck also reduces condensation risk.
The membrane should be taken up the wall or parapet by at least 150mm and properly bonded or mechanically fixed at the top edge. All penetrations - soil pipes, flues, rooflights - need individual collared detailing. Outlets should be positioned at the lowest point of the fall, not wherever happens to be convenient.
When the job is done, you should be able to walk the finished roof (carefully, on a dry day) and see a clean, unbroken surface with neat upstands, no pooling, and all trims firmly fixed. If there is standing water within 48 hours of rain, the falls are not adequate and that needs addressing before you make final payment.
Flat roof replacement on a typical domestic extension or garage in this area costs in the region of £70 to £120 per square metre for an EPDM or quality felt system, depending on the condition of the existing deck, the complexity of the detailing and access. A straightforward single garage roof of around 15 square metres might cost £1,200 to £2,000 fully completed. These are typical current UK ranges; your specific quote will depend on the survey.
For a repair rather than a full replacement, the cost depends entirely on what needs doing - a single upstand resealed or a patch over a blister is a modest job, whereas repointing flashings and repairing multiple areas of a large felt roof can approach or exceed the cost of replacement.
If you are unsure whether your flat roof needs a repair or a full replacement, or if you want an honest assessment before committing to any contractor, call Brandon Roofers and ask for a flat roof survey. We will tell you what we find and what we recommend - with no obligation to use us.
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Call any time. Calls are answered day and night and passed straight to our roofers.
