Flat roofs in Cardiff take a beating from the weather. They sit flat or nearly flat, so rain does not run off quickly, and any weak point in the covering lets water straight into the ceiling below. A small stain that is ignored for a winter can turn into rotten decking and a much bigger job.
Flat Roofing South Wales repairs and replaces flat roofs across the city, including Canton, Heath, Roath and Whitchurch. We find where the water is getting in, tell you straight whether a repair will hold, and fit EPDM rubber, GRP fibreglass or felt depending on what suits the roof. Quotes are free and we explain every option.
The most common flat roofs in the city are on the back of terraces. Victorian and Edwardian houses in Cathays, Splott and Grangetown often have a rear kitchen or bathroom extension with a flat top, and many have been added to or altered more than once. Those roofs are usually small, hemmed in by walls, and awkward for water to escape from.
On the semis and villas of Pontcanna, Llandaff, Rhiwbina and Cyncoed, flat roofs show up as garages, side extensions, porches and dormers. Loft conversions are also common across the city, and their flat dormer tops are exposed to a lot of rain. In the busier streets, small shop and commercial units often carry flat roofs of their own.
Cardiff's wet, windy weather finds weak spots fast. Water ponds where decking has dipped, edges and upstands open up, and leaves and moss block outlets. Old felt cracks when it freezes and warms again. Once the covering splits, the water gets into the timber below and spreads along it, which is why catching a leak early matters so much.
A single sheet of rubber suits many Cardiff extensions and garages because there are few joints to fail. It copes well with the movement and wet weather, and it can be laid quickly even on awkward terrace roofs.
Fibreglass is laid in one seamless layer and is firm underfoot, which suits dormers, porches and balconies. It works well on small roofs with lots of corners and upstands, where a sheet would need cutting.
Modern felt systems are a sound choice for larger or simpler roofs, and for budgets that need to stay modest. Laid in layers and detailed carefully at the edges, it gives a reliable covering for garages and outbuildings.
Not every leak means a new roof. If the covering is mostly sound and the fault is a split seam, a failed upstand or a blocked outlet, a repair can be the right call. We trace the water to its source first, because a stain on a ceiling is often some distance from the actual hole.
If the decking is soft, the roof is ponding badly, or the covering has failed in several places, patching only delays the problem. In that case we tell you plainly that replacement is the better route, show you why, and set out the options. Emergency repairs are also covered, and we will make the roof watertight first and discuss the full fix afterwards.
At Flat Roofing South Wales, we provide professional flat roofing installation, replacement and repair services throughout South Wales, helping homeowners, landlords and businesses maintain watertight and dependable roofs.
Often it can, if the fault is a split seam, a lifted edge or a blocked outlet and the decking underneath is still sound. We trace the leak, check the timber, and tell you honestly whether a repair will last or a new covering is wiser.
For a small rear extension on a terrace, EPDM rubber is a common choice because a single sheet leaves very few joints. GRP fibreglass is also a good fit where there are lots of upstands. We look at the roof and recommend one.
Yes. Dormer tops are exposed, hard to reach and often have tight junctions with the main roof and cheeks. Fibreglass or rubber with properly detailed upstands and flashings tends to work best, and the edges need careful finishing to keep water out.
Common signs are a soft or spongy feel from inside, dark staining on the ceiling, and sagging that holds water. We would check from the inside and outside before quoting, and renew any rotten boards before the new covering goes on.
Many garage roofs are small enough to strip and recover in a short job, weather permitting. The time depends on the size, the condition of the decking and the system chosen. We will give you a realistic idea when we quote.
Tell us about the job and we'll get back to you — usually the same day.
Prefer to talk? Call 07766 547309.
