A lot of the repair calls we get have one thing in common: someone has already been out to the roof. A tile got swapped, a bead of sealant went on, the ceiling dried out for a fortnight, and then the same stain crept back after the next proper downpour.
If that is your roof, the earlier repair was not necessarily bad work. It was simply aimed at the wrong spot, and understanding why is the key to making the next repair hold.
The reason those earlier repairs didn't hold comes down to a single fact lost on a lot of people doing this work: water doesn't enter a roof directly above the spot where it shows up indoors.
Why the Ceiling Stain Isn't Above the Real Leak
Once water gets past the tiles or slates, it doesn't drop straight down. It runs along battens, follows the line of a rafter, tracks across the underlay until it finds a nail hole or a tear, and only then drops onto your ceiling, sometimes a metre or two from where it actually came in.
A roofer who takes a quick look in the loft, sees a wet patch on the felt, and replaces a tile directly above it has almost always missed the real problem. The repair holds for a week or two while the weather's kind, then the leak comes back.
Your Roof Is a System, Not Just a Covering
A roof isn't just the bit you can see from the street. It's a system of layers that all depend on each other:
- Tiles or slates, the visible weather covering
- Underlay, bituminous felt or modern membrane beneath, the second line of defence
- Battens, the timber rails tiles are nailed to
- Deck and rafters, the structural timber underneath
- Flashings, lead or metal where the roof meets walls, chimneys, valleys
- Drainage, gutters, downpipes and valleys taking water off the roof
Diagnosing a leak properly means understanding where every one of those layers can fail, and tracing the path the water has actually taken. That's what we do, and it's why every repair survey ends with a written report and photographs of what we've found, before we quote you anything.