
Chapter one
Where a roof meets a mathematical-tile wall
Hung tiles and pebble facing sit hard against the roof edge, so the lead that seals the join does more work than it looks.
The Victoria County History records that many Brighton houses were covered in tile-hanging made to imitate brickwork, known as mathematical tiles, and that some walls are faced with beach pebbles. Both finishes matter to a roofer for one reason: they sit directly against the roof edge. Wherever a slope stops at a hung or pebbled wall, the junction is closed with a lead flashing, a strip folded over the joint, and with soakers, the small lead sheets threaded under each course of tiles up the side of the wall. An uneven face gives a flashing little to grip, so these are the joints that fail first and show their damage furthest from the cause.
At a glance
- Hung tiles imitate brickwork on older Brighton houses
- Soakers and flashings seal the roof to the wall
- A stain often sits a metre from the fault

1.1 How we trace a leak at the wall
A stain on a bedroom ceiling rarely sits under the fault. Water enters at the abutment, runs along a rafter or down the back of the wall and drips out a metre away. We start outside with a ladder, checking that the lead is still tucked into its joint, that the soakers lie flat and that no hung tile has slipped or cracked beside the roof edge. Inside, we look in the loft at the wall plate and the rafter ends for staining. Each suspect point is photographed, so the written quote shows your own wall and your own lead, not a stock picture.

1.2 Repairing without spoiling the wall
Tile-hung walls are fragile around the edge of a roof. A cracked mathematical tile cannot simply be swapped for whatever is to hand, because its shape, size and colour are part of how the house looks. We lift as few tiles as the job needs, set aside sound ones for re-use and match any replacement to the courses around it. New lead goes in at a code suited to the position, and our lead roofing page explains the codes and how long lead typically lasts. Where the fault is a split flashing, dressing fresh lead usually settles it, and that is what we will say rather than pushing a larger job. If the covering beside the wall has also gone, our roof repairs page sets out when a patch holds and when it does not. Sea air carries salt a good way inland, and a repair near the seafront is made as if the next gale were already on its way.
Tracing a leak at a hung-tile wall
- Lead first We check the flashing is tight in its joint and not lifting.
- Soakers next We look for slipped or missing soakers up the wall edge.
- Hung tiles We note cracked or loose tiles beside the roof line.
- Loft check We look at the wall plate and rafter ends for water trails.







