The catch in Taunton is that many extensions, garages, and outbuildings are still covered with older felt systems that were ready for replacement some time ago.
The Usual Suspects on a Taunton Flat Roof
Blistered and cracked felt is one of the most common problems. Moisture becomes trapped between the layers of felt, then warms up and expands, creating blisters. Once the surface lifts, it no longer keeps water out effectively, allowing moisture to work its way underneath. Somerset’s damp climate means blistered felt roofs often deteriorate more quickly than they would in drier parts of the country.Ponding water is another frequent issue. Despite the name, no flat roof is completely flat. Every flat roof is designed with a slight fall so rainwater drains towards an outlet. When that fall becomes insufficient, outlets become blocked, or the roof gradually settles over time, water begins to collect. Standing water accelerates wear on felt and will eventually find its way through weak spots in GRP or EPDM roofs, particularly around joints and upstands.
Upstands and flashing are also common points of failure. An upstand is the section where the waterproof membrane turns up a wall, while flashing seals the roof where it meets windows, doors, or masonry. These junctions fail more often than the centre of the roof. Felt upstands can crack and peel away, while lead flashings may lift or split around the edges.
Blocked outlets are one of the simplest maintenance issues to prevent, yet they are often overlooked. Once an outlet blocks, water backs up across the roof surface. On a roof already suffering from ponding, the extra weight of standing water can begin to deflect the structure, making drainage even worse.
Patch It or Replace It?
A repair is usually the right choice when the membrane itself remains in good condition and the problem is limited to a single joint, upstand, flashing, or isolated damaged area. A small blister in otherwise sound felt, or an EPDM seam that has lifted near a wall, can often be repaired successfully.Replacement is generally the better option when the felt has become cracked and brittle across the whole roof, when blisters or failures appear in several locations, when the roof has reached the end of its expected lifespan, or when water has been penetrating long enough to damage the timber deck beneath.
Roof Repairs Taunton assesses flat roofs according to their condition rather than simply their age. A well-installed GRP roof that is over 20 years old may still have many years of service left, while a poorly fitted felt roof could require replacement after only a decade.
What to Replace It With in Taunton
GRP fibreglass has become one of the most popular replacement options in Taunton. It creates a seamless, glass-reinforced polyester surface that is tough, durable, and free from joints where water can penetrate. With an expected lifespan of 25 to 40 years, it costs more than felt initially but often proves the more economical option over time.EPDM rubber is another excellent choice. This single-ply membrane is bonded directly to the roof deck and remains flexible enough to cope with thermal movement that can crack more rigid materials. It is particularly popular on larger roofs where GRP becomes more expensive, and its lifespan is comparable at around 25 to 40 years.
Modern torch-on felt is also a significant improvement over older bonded felt systems. It is thicker, tougher, and adheres more securely. While it generally will not last as long as GRP or EPDM, it remains a sensible option where budget is the primary concern.
The Numbers for Taunton
Typical repair costs for a felt roof, including a patch repair, upstand, or flashing repair, usually range between £150 and £400.Replacing a felt roof on a small extension or garage of up to 20 square metres generally costs between £900 and £1,800.
A GRP fibreglass replacement over the same area typically ranges from £1,500 to £2,800.
An EPDM rubber roof of the same size usually costs between £1,200 and £2,500.
For larger roofs of between 20 and 50 square metres, costs generally increase in proportion to the area, although the price per square metre often reduces slightly on larger projects.
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FAQ
Q: How long should a flat roof last in Taunton?A: Traditional felt generally lasts between 10 and 20 years. Modern torch-on felt typically lasts 15 to 25 years, while GRP fibreglass and EPDM rubber can both provide 25 to 40 years of service. Somerset’s high rainfall means flat roofs often experience more demanding conditions than those in drier regions, so many roofs will fall towards the lower end of these lifespan estimates.
Q: Can a flat roof be repaired instead of replaced?
A: Yes. If the membrane remains in good condition across most of the roof and the problem is confined to one area, a repair is often worthwhile. Once blistering, cracking, or brittleness affects the entire roof, replacement usually offers better long-term value.
Q: Is GRP a better bet than felt for a Taunton extension?
A: For most extensions, yes. GRP provides a seamless, longer-lasting surface that often justifies its higher initial cost by avoiding another replacement within 15 years. On larger garages or where budgets are tighter, modern torch-on felt remains a practical alternative.
Q: Why is my flat roof leaking when there’s no obvious damage?
A: Flat roof leaks usually begin around upstands, flashing, or drainage outlets rather than in the middle of the roof. Water can also travel some distance beneath the membrane before appearing inside, so the visible ceiling stain may be several feet away from the actual point where the leak begins.
Q: Do I need planning permission to replace a flat roof in Taunton?
A: A straightforward like-for-like replacement normally does not require planning permission. However, if you change the structure or height of the roof, permitted development rules may apply. Listed buildings and properties within conservation areas may also require consent before external work begins.
Article kindly provided by roofrepairstaunton.co.uk