Chapter 1: Why does it leak where the roof meets the wall on our newer Shinfield West house?
What we find
Where a roof slope stops against a higher wall, such as a two-storey section beside a garage or a dormer cheek, water is carried off by a flashing. That is a strip of lead or a metal-backed product dressed over the tiles and into the brickwork. On houses built in a hurry, the flashing is sometimes finished with a bead of sealant in place of a proper chase cut into the mortar, and sealant fails as the sun and frost work on it.
The leak often appears away from the actual fault. Water runs along the underlay and drips onto the plasterboard some distance down the wall. You may see a faint brown line on the ceiling beside an internal wall, or a damp patch on the wall itself after a wet week. Peeling paint on the inside of an outer wall is a warning.
What we fix
We expose the junction, check the underlay and battens for damp, and make up the flashing in lead, cut into the brick joint and dressed down over the tile. Where the roof steps against the wall, step flashings follow each course so water cannot travel behind them. Sealant is used only as a final touch, never as the weatherproofing.
This is a repair, and it usually takes a short visit, not days. If the underlay has been wet for some time, we replace the damaged piece and check the timbers behind it. A newer roof with a good main covering does not need replacing for one flashing, and we tell you so plainly. Our leadwork page shows how flashings are made and fixed.