If your flat roof is leaking in North Walsham, the hours before a roofer arrives matter - knowing what to do and what not to do yourself can limit the damage significantly.
We install and repair flat roofs on extensions, garages, and commercial buildings across Norwich and the surrounding area, including North Walsham. The materials we use are EPDM rubber and torch-on felt, both of which are a significant improvement on the old single-layer mineral felt that was standard for decades. Before we quote for any job, we survey the roof fully and produce a written specification, so there are no surprises about what is being installed or why.
A properly installed flat roof involves far more than laying a membrane. The falls must be correct so water drains rather than ponds. Every edge, upstand, and penetration must be detailed individually. Flashings at the junction between the roof and any wall must be dressed correctly. When any of these elements fail, water finds its way in - often well away from where it appears inside the building.
Understanding where flat roof leaks come from helps you make sense of what a roofer will look for and why the entry point is so rarely where you expect it to be.
Water travels. It enters at a failure point in the membrane or flashing, then runs along the top of the deck, along a joist, across a ceiling board, and finally drops somewhere that has nothing to do with where it entered. A drip in the middle of a room may be coming from an upstand failure at the far edge of the roof. A damp patch near a wall may be coming from a blocked outlet two metres away.
Common failure points on flat roofs include:
When you discover an active leak, there are a few things you can do immediately that will reduce the damage while you wait for professional attention.
Protect the interior. Place a bucket, container, or thick towels under any active drip. If water is reaching electrics - a light fitting, a socket, a fuse board - turn off the circuit at the consumer unit and do not restore power until the area is dry and has been checked. Water and live electrics are a serious hazard.
Move valuable items. If the leak is above stored items in a garage, extension, or loft, move them out of the wet area as quickly as possible. Damp conditions develop mould faster than most people expect - items left sitting in pooled water for even a day or two can be damaged beyond recovery.
Note the pattern. When does the leak appear - during heavy rain, light rain, or only after a period of sustained rainfall? Does it worsen when the wind comes from a particular direction? Does it appear to be dripping steadily or only when rain is actively falling? These observations help a roofer locate the source much faster than a visual inspection alone.
Check whether a gutter or outlet is blocked. If you can safely see a gutter from the ground or from a window, and it is overflowing during rain, a blocked gutter may be contributing to the problem by backing water up under the drip edge. If the gutter is clearly blocked with debris, clearing it is a reasonable step - but only from a ladder on firm, level ground, with someone else present.
This is the part that matters most. Well-intentioned DIY on a leaking flat roof frequently makes the problem worse, more expensive to fix, or both.
Do not go on the roof unless you have proper access equipment and a safe working platform. A flat roof is not as accessible as it looks from the ground. The surface may be soft in places if the deck is wet. There are no handholds. A fall from a single-storey flat roof is still a fall of two and a half to three metres onto a hard surface. Do not take that risk to investigate a leak.
Do not apply sealant, bitumen paint, or roofing tape to a wet surface. None of these products bond to a wet membrane. If you apply a sealant over a wet, dirty surface in the rain, you are creating a surface layer that looks like it might be holding but is not bonded to anything below it. When it fails - which it will quickly - it may have obscured the actual failure point, making it harder for a roofer to find and repair properly.
Do not pull at the ceiling or membrane to try to find the entry point. The relationship between where water appears and where it entered is rarely direct. Disturbing the ceiling structure or the roof membrane without knowing what you are looking at can create additional entry points and cause more water to flow into the building.
Do not assume the problem is small because the leak appears small. A visible drip may represent several weeks of slow water infiltration. By the time a leak is visible inside, the deck may already be wet across a larger area than the drip suggests. Early professional attention limits the remedial work needed.
There is one genuinely useful temporary measure if you cannot get a roofer to attend for several days and rain is forecast: a heavy-duty polythene sheet weighted down at its edges. This does not repair anything, but it can reduce the volume of water entering if the membrane has a large, visible split or the felt has blown back at an edge. It is not a repair and should not be left in place for longer than absolutely necessary, because the sheet itself can hold water and create new problems if not weighted and positioned correctly.
Proprietary liquid roof sealants, bitumen coatings, and self-adhesive patches sold in DIY stores are not a substitute for a proper repair. They may slow a minor leak temporarily on a sound membrane, but on a failing roof they mask the problem and can complicate the repair work needed later.
Any active flat roof leak warrants professional attention promptly. The longer water has access to a timber deck, the more likely it is that the deck itself will need repair or replacement alongside the membrane, which adds significantly to the cost. An isolated membrane fault found and fixed early is a minor job. The same fault left for a season is potentially a deck replacement.
We cover North Walsham and the surrounding area as part of our Norwich and Norfolk service area. Call us to arrange a flat roof survey - we will get on the roof, identify the source of the problem, and give you a clear explanation of what needs doing and what it will cost, with a written specification before any work begins.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
