A roof that stays dry in a shower but drips in a downpour usually has a small, specific weakness. Here is how that happens on Brislington's semis and what we do about it.
Light rain runs off a roof and heavy rain tests it. When water only shows up in a downpour, the roof is normally letting in a little at one point that light rain never reaches. Brislington has plenty of hipped semis, garages and extensions, and each has its own likely culprits. Finding the real entry point comes first.
Why heavy rain finds what showers miss
In a shower, water sheds quickly and stays on the surface. In a downpour it sheets across the roof, backs up behind joints and gets pushed sideways by wind. A cracked tile, a lifted flashing edge or a gap at a hip can pass a drizzle without trouble and then let water through when the roof is flooded with it. That is why a roof can look sound and still leak badly in a storm.
Where we look on a hipped inter-war or post-war semi
Hipped roofs have more joints than a plain gable: hip ridges running down each corner, a main ridge and the junctions where they meet. Old bedding mortar under those tiles shrinks and cracks with age, which opens a path for driven rain. Hipped roofs and chimney stacks on semis need a close look because their joints take the worst of the wind.
We also look at the chimney junction, the flashing along the party wall between semis and any valley where two roof slopes meet, since these are where rain most often finds a way in. Each of those is a place where two surfaces meet, and meetings are where water gets in. We photograph what we find so you can see it.
- Cracked or slipped tiles near the hips and ridge
- Mortar bedding that has shrunk, cracked or dropped away
- Flashings lifting at chimneys and party walls
- Blocked gutters sending water back up under the first row of tiles
Extensions and garages as a second suspect
Many homes here have an extension or garage added to the main house. Where its roof meets the original wall, a flashing or a short flat section does the sealing, and that detail is a common place for heavy rain to get in. A stain on a ceiling below the join often points straight to it, and older village-core houses with later additions are no different. We check both sides of the joint.
What you can check without going near the roof
From the ground, look for tiles that sit out of line, a sagging ridge line or gutters spilling over. Inside, a torch in the loft can show damp timbers, dark patches on the felt or a hint of daylight. Note where stains sit and whether they grow after storms, and take a photo to show us. Please do not go onto the roof yourself; call us for a proper look and we will deal with it safely from our own access.
How we trace the leak and put it right
Water runs along timbers and felt before it drips, so the stain is rarely under the hole. We follow the damp back up the slope, find the entry point and explain what we see. Most fixes are small: replacing tiles, re-bedding a hip, renewing a flashing. If the wider covering is tired, we say so plainly and you decide. You get a straight explanation of what failed.
Frequently Asked Questions
Why does my ceiling stain appear away from the leak?
Water travels along rafters, battens and the underlay before it drips through, sometimes some distance from where it got in. That is why we work back up the slope from the stain rather than just patching the area directly above it.
Is a leak that only shows in storms urgent?
It should not be left. Damp timber and insulation get worse out of sight, and the next storm may be heavier. A temporary measure may be possible while we arrange the proper repair, so call us as soon as you notice the problem.
Could the problem be condensation, not a leak?
It can be. Condensation tends to show as damp on cold surfaces whatever the weather, while a leak follows rainfall closely. We check the loft for both, since the fix is quite different for each.
Talk to our team about roof repairs in Brislington
Every roof is different — the fastest way to get an accurate answer is a quick chat with our team.