Chapter 1: Why does my Georgian house in Hungerford leak when it rains hard, with no tiles missing?
What we find
On a pattern-book Georgian house the roof is often a pair of low slopes meeting at a valley, or a slope running back from a parapet wall, and the water from both ends up in a lead-lined channel. That channel is called a valley gutter or a parapet gutter. It is narrow, it is hidden from the street, and it handles a large share of the roof's rainfall in a single run. A few pieces of moss, a handful of leaves or a split in the lead can send water over the edge and into the wall.
The signs are rarely on the roof itself. Look for a brown stain high on the party wall, a damp patch on the first-floor ceiling beside the chimney breast, or plaster blown from a wall that is dry at the other end. Because the slates look intact from the road, owners often chase the wrong cause for a season or two.
What we fix
We start by getting up to the gutter with a camera, clearing it and photographing the lead along its length. Lead is a metal that moves with the weather, and over many years it work-hardens at the folds and cracks. A small split can be repaired with a lead patch welded or bossed into place. Where the sheets have thinned, we lay a new lead lining over a fresh timber fall, which is the slight slope that stops water pooling, and we lap it under the slates on both sides.
Typical UK figures for leadwork on a chimney run from £350 to £920, and valley work is quoted by the length of the run; your fixed quote follows the survey. Lead grades and how long each lasts are covered on our lead roofing page.