If your garage, extension or outbuilding has a flat roof that is more than fifteen years old, the chances are it is either leaking already or quietly heading that way. Traditional mineral felt flat roofs were the standard for decades across Aylesbury, from the post-war garages of Bedgrove to the extension roofs of Fairford Leys and Walton Court, but they have a finite lifespan and they do not age gracefully.
At Kingsway Roofing we replace and repair old felt flat roofs with modern, high-performance systems that are designed to last twenty-five years and more. We install EPDM rubber membrane and GRP fibreglass flat roofing across Aylesbury and the Vale, using our own employed team, never subcontractors. Every installation comes with a free survey, a fixed written quote and a 20-year workmanship guarantee.
The difference between a modern flat roof and an old felt one is not just the material. It is the quality of the deck preparation, the detailing at the edges and upstands, and the standard of the installation. A badly fitted EPDM membrane will fail just as surely as a badly laid felt roof. That is why we take the time to do the substrate work properly before any membrane goes down.
Why Choose Kingsway in Aylesbury
What We Deliver
Modern EPDM rubber and GRP fibreglass systems with 25-30+ year lifespans
Full timber deck inspection and replacement where required, with no covering over rot
Free no-obligation survey with drone photography and honest assessment
20-year written workmanship guarantee on every flat roof installation
No subcontractors. Our own Aylesbury team surveys and fits every roof.
No deposit required. You pay only when the work is complete and you are satisfied.
Insurance-backed guarantees available on request
Traditional Felt vs Modern GRP Fibreglass & EPDM Rubber Membranes
The flat roofing industry has moved on significantly from the days of pour-and-roll bitumen felt. If you are weighing up your options for an Aylesbury property, here is an honest comparison of the three main approaches we work with.
Traditional mineral felt
The old standard. Cheaper upfront but susceptible to blistering, cracking and ponding. Typical lifespan of 10-15 years before problems begin. We will repair sound felt roofs, but for full replacements we recommend modern systems.
EPDM rubber membrane
A single-ply synthetic rubber membrane that is fully bonded to the deck. Exceptionally UV-stable, flexible in all temperatures and resistant to ponding water. Lifespan of 30+ years. Ideal for domestic extensions and garages across Aylesbury.
GRP fibreglass (Glass Reinforced Plastic)
A cold-laid laminate that cures into a single, seamless, rigid shell. Completely waterproof, impact-resistant and ideal for flat roofs with complex shapes or foot traffic. Lifespan of 25-30+ years with zero maintenance.
Why Replace Old Flat Roofs?
Most of the flat roof replacements we carry out across Aylesbury are prompted by the same handful of warning signs. Ignoring them does not save money. It usually means a more expensive repair later, once timber decay has set in.
Ponding water on the surface
Water that sits on a flat roof for more than 48 hours after rain is a sign that the fall (slope) has been lost or was never adequate. Standing water degrades the surface, adds weight and eventually finds its way through. Common on older garage roofs across HP19 and HP20.
Blistering and cracking felt
Blisters form when trapped moisture or air expands beneath the felt on hot days. Once the surface cracks, water enters the substrate. If you can see blistering from the ground, the roof is nearing the end of its life.
Timber rot in the deck
Once water penetrates the felt, the timber deck beneath begins to rot. A spongy or springy flat roof is a sign of structural decay. Replacing the membrane without addressing rotten timber is a waste of money, so we always inspect and replace deck boards as part of a proper replacement.
Failed edge trims and upstands
Water often gets in at the edges where the flat roof meets a wall or gutter. Deteriorated trims and perished sealant are common entry points on older installations across Fairford Leys and Walton Court.
100% Free, No-Obligation Surveys
20-Year Workmanship Guarantee
Fully Insured, Locally Employed Roofers
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Google Reviews, 5.0 average rating
What Aylesbury Customers Say
Trusted by Homeowners Across Aylesbury
Real reviews from real Aylesbury homes, from Fairford Leys to Bedgrove and the Town Centre.
Sarah M.
Fairford Leys, Aylesbury
Kingsway came out the same day after a storm lifted several tiles off our Fairford Leys roof. They were prompt, tidy and refreshingly honest about what actually needed fixing. No upselling, just a proper repair backed by a guarantee. Cannot fault them.
David R.
Bedgrove, Aylesbury
Our garage flat roof had been blistering and ponding for years. Kingsway stripped it back to the timber, replaced a couple of rotten deck boards and installed a GRP fibreglass system. The difference is night and day. The team was professional throughout and left the site spotless. Highly recommend.
Linda T.
Watermead, Aylesbury
We had damp coming through around the chimney stack in our Watermead property. Kingsway repointed the stack, replaced the lead flashing and photographed every stage of the work. No more leaks after the next lot of rain. Genuinely impressed with the quality and the transparency.
Michael B.
Walton Court, Aylesbury
After getting quotes from three roofers, Kingsway were the only ones who actually went up on the roof to inspect it properly before quoting. The repair was done in a single visit and the final price was exactly what they said it would be. That kind of honesty is hard to find.
Joanne P.
Aylesbury Town Centre
EPDM rubber membrane fitted on our extension flat roof. From the first survey to the finished job, everything was explained clearly and the workmanship is top notch. Six months on and not a single issue. The team even cleaned the gutters before they left.
Robert K.
Stocklake, Aylesbury
Our chimney pot was cracked and letting water in. Kingsway removed the damaged pot, capped the flue with a ventilated cowl and repointed the whole stack. They even matched the mortar colour to the original brickwork. A proper job done by people who clearly care about their trade.
See Our Other Roofing Services in the Area
More Aylesbury Roofing Services
Same-day emergency leak repairs, slipped tile refixing and storm damage restoration across Aylesbury.
Stack repointing, lead flashing renewal and chimney pot capping for Aylesbury homes.
Looking for a full roofing overhaul? View our complete Roofers Aylesbury hub for all our local roofing services across HP19, HP20 and HP21.
Common Questions
Flat Roof Replacement in Aylesbury: Your Questions Answered
How long does a flat roof replacement take in Aylesbury?
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Most domestic flat roof replacements, such as a garage or single-storey extension, are completed in one to two days. Larger or more complex roofs with multiple upstands and details may take three to four days. We strip the old roof, inspect and replace any rotten timber, fit the new system and finish the detailing in a single continuous visit. You will be given a realistic timeframe in your written quote.
Should I choose EPDM rubber or GRP fibreglass?
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Both are excellent systems and either will outlast traditional felt by decades. EPDM is ideal for straightforward flat roofs and domestic extensions because it is flexible, UV-stable and very quick to install. GRP fibreglass is better for roofs with complex shapes, multiple upstands or where foot traffic is expected, as it cures into a rigid, seamless shell. We will recommend the right system for your specific roof after the survey.
Can you replace the flat roof on my Aylesbury garage?
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Yes. Garage flat roof replacement is one of the most common jobs we carry out across Aylesbury, from the post-war garages in Bedgrove to the modern blocks in Watermead. We strip the old felt, replace any rotten deck timber and install a modern EPDM or GRP system that will last for decades.
Do you need to remove the old felt or can you overlay it?
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We always strip the old roof down to the timber deck. Overlaying new membrane on top of old felt is cheaper but it traps moisture, hides rotten timber and shortens the life of the new roof. A proper replacement means starting from a sound, dry substrate. Anything else is a false economy.
What guarantee do I get on a flat roof replacement?
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Every Kingsway flat roof replacement carries a written 20-year workmanship guarantee on labour, plus the manufacturer material warranty that applies to the EPDM or GRP system we install. Insurance-backed guarantees are available on request. If the roof fails within its guarantee period due to our workmanship, we return and put it right at no cost.
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