Flat Roof Repairs Bebington

Flat Roofing in Bebington

The hipped semi with a bay window is the house that built Bebington. Higher Bebington, Lower Bebington, Spital and the roads around Kings Road and Town Lane are full of them, and on a great many the bay carries a small flat roof of its own: a canopy at first-floor level, tucked in under a bedroom window, perhaps a metre and a half of covering all told.

It is the smallest flat roof on the house and, for its size, the most awkward. There is almost no field to it. A canted bay gives the canopy angled returns and a set of corners, there is an abutment against the house wall along the back, a front edge over the gutter, and that is the whole roof. Every square inch of it is a detail, and details are what leak.

The original covering was usually lead, zinc or asphalt, and what is up there now is often felt laid over the top of it at some point and painted with bitumen since. Where we replace one it is in EPDM rubber; the material, the deck and the bonding are covered on the EPDM rubber roofing page rather than here.

The Flat Canopy Over a 1930s Bebington Bay

Think about what a bay canopy actually is. The bay projects from the front wall, usually canted, so the little roof on top has an angled corner at each end, two short returns, a longer front edge and a back edge running into brick or render. Five edges and four corners in something you could cover with a bedsheet. None of it is a straight run, either: the two angled corners are the bay’s own geometry, settled when the ground floor was built, and the roof on top has no choice but to follow them.

The back edge is set by the house rather than by the roof. The covering has to be carried up the wall as an upstand, and BS 6229 and NHBC guidance put that at 150mm minimum above the finished roof surface — but on these semis the bedroom window sits directly over the bay, and the cill is where the cill is. That constraint is a general one and it is answered in general terms in garage, extension, dormer or porch, under the question about a roof that meets the house under a window.

What is particular to Bebington is how many houses have exactly that arrangement, because it is not an accident of one build — it is the standard plan of the street. Bay, canopy, window above, repeated down both sides of the road and mirrored in each pair. Whatever is decided at that back edge is decided on a shape somebody drew before the road was laid out, which is why it is worth looking at properly rather than discovering with the old covering already off. Most canopy leaks are perimeter leaks, and why flat roofs leak at the edges sets out the mechanism.

What a Failing Bay Canopy Shows You From Inside

The first sign is nearly always indoors and nearly always blamed on the window. Damp in the corner of the bay ceiling. Wallpaper lifting above the window head. Paint blistering on the inside of the cill, or a cold musty smell in the bay recess of a room that is otherwise perfectly dry. Resealing around the window changes nothing at all when the water is arriving from the roof above it.

From the pavement a bay canopy is close to eye level and easy to read. Look for a cracked mortar line where it meets the wall, a front edge that has begun to sag or has parted company with the gutter, dark staining down the brickwork under one of the corners, and any sign that the thing has been painted rather than repaired. It is also the roof most often skipped over when the main roof was last done.

Getting to the Roof in Bebington

A bay canopy is the one flat roof where access can be genuinely small. It is low, it is over the front garden, and on many of these houses it can be reached from a properly footed ladder for an inspection. Doing the work is another matter, and because the canopy sits over the front path and often close to the pavement, anything standing on the footway needs permission from Wirral Council as highway authority, arranged in advance rather than on the morning.

The practical point is that a good deal of a day on a small roof goes into getting to it and away from it again. If the porch canopy, the gutter above the bay or a length of the main roof also want attention, it is worth doing them on the same visit rather than paying for the access twice. Where a scaffold or a tower is needed it is quoted separately, so you can see it as its own line rather than buried in a rate.

Decks, Falls and Detailing in Bebington

On a canopy the deck is small and the fall is short — often little more than a metre from the wall to the front edge — and a short run is exactly where a fall gets lost. Over that distance the difference between a roof that drains and one that holds water against the brickwork is a few millimetres of firring, cut and checked rather than eyeballed. The rule those millimetres come from is the same one that governs a roof many times the size, and it is set out with the material rather than argued out here.

At the front, the covering is dressed over a fixed edge trim and down into the gutter, so water leaves the roof rather than running back behind the fascia. At the corners the sheet is formed rather than folded flat, because a folded corner on an angled bay return is a crease waiting to split. And the gutter itself is worth checking while the access is there, since a canopy draining into a blocked gutter will go on marking the brickwork whatever is done on top of it.