If your flat roof in Honing is showing early warning signs, acting quickly is almost always cheaper than waiting until water finds its way inside.
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Flat roofs rarely fail without warning. The problem is that the warning signs are easy to miss or dismiss until a wet ceiling makes the situation impossible to ignore. Knowing what to look for - and understanding why these things happen - gives you a real chance to deal with a repair before it becomes a full replacement.
The most obvious sign is ponding water: puddles that sit on the surface for more than 48 hours after rain. Some ponding is normal on any flat roof, but standing water that has nowhere to drain eventually breaks down felt and softens the substrate beneath it. On older felt roofs in particular, this leads to blistering, cracking and eventually splits where water works its way through.
Most flat roof failures come down to one of a handful of causes. Poor original installation is the most common - flat roofs are less forgiving than pitched roofs and small errors in detailing, particularly around edges, outlets and upstands, become significant leaks over time. A roof laid without adequate falls (ideally at least 1:80 gradient) will pond water from day one.
Age plays a role too. Traditional built-up felt has a finite working life, and once it passes 15 years without any maintenance, the odds of finding splits and open seams increase sharply. EPDM rubber roofing has a longer working life - manufacturers typically quote 20 to 25 years or more for the material itself - but joins and perimeter details still need periodic inspection.
Weather puts flat roofs under real pressure. Wind also lifts edges and flashings over time, especially on low-parapet roofs where the edge detail carries a lot of stress.
A thorough flat roof inspection should cover the whole surface, not just the area above where damp has appeared inside. A roofer should check the falls and drainage outlets, probe for soft areas in the decking, inspect every upstand and flashing detail, and look at the condition of any solar fixings or service penetrations. On a felt roof, they should be able to tell you whether the failure is surface-deep or whether the decking beneath has been compromised.
If the decking is sound and the damage is limited, a repair may well be the right answer - cutting out the damaged section, replacing felt or EPDM patch and properly lapping the joins. If the decking is wet and degraded across a wide area, a complete strip and replacement is more honest advice and, in the long run, better value.
As a rough guide, if a felt flat roof is under ten years old and the damage is localised, a targeted repair makes sense. If it is over 15 years old and you are patching it every couple of years, a full replacement - ideally in EPDM rubber - will serve you better and costs less cumulatively. EPDM replacement on a typical domestic extension or outbuilding in this part of North Norfolk currently runs from around £80 to £120 per square metre installed, depending on size, access and whether the decking needs replacing.
Felt replacement tends to come in slightly cheaper per square metre, but felt has a shorter service life, so the longer-term cost per year of cover is often higher.
We cover Honing and the surrounding villages across North Norfolk, including North Walsham, Stalham, Worstead, Trunch, Knapton, Swafield and nearby communities. Flat roof work in this area includes repairs to extensions, single-storey rear additions, garages, outbuildings and small commercial premises. We work on both felt and EPDM rubber systems.
If you have noticed any of the warning signs described above, call us for a flat roof survey so we can give you an honest assessment of what the roof actually needs.
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Call any time. Calls are answered day and night and passed straight to our roofers.
