The short answer
On older houses, leaks tend to start at the joints rather than across the open slope: valleys, chimney bases, parapet gutters and the lead where one roof meets another. A damp edge by a shared wall is more often a flashing than a tile, and tracing the real entry point comes before any quote.
Lechlade sits low beside the river, with the Leach joining the Thames close to St John's Bridge. Whatever the weather does, water on a roof follows the same rules. It runs down, finds the lowest or weakest joint and gets in. Our job is to follow its path.
Q3.1Why do valleys and parapets leak?
Valleys are the internal angles where two slopes meet, and they gather a great deal of water. On older houses it is usually lined in lead, which can crack where it has been bent too tightly or lifted by repeated movement. Parapet gutters, where a wall rises above the roof edge, have the same weakness. Our lead roofing page explains how lead is worked and what its codes mean.
Q3.2How do chimneys let water in?
Old stacks carry flaunching, the sloped mortar cap that seats the pots, plus lead flashings round the base. Cracks in either let water run down the flue and into the ceiling below, and a stain beside a chimney breast is often the first sign. Often the stack is sound and the lead has simply aged, which is welcome news because relining a joint costs far less than rebuilding brickwork. Replacing the lead, with a chimney lead code chosen for the job, costs far less than rebuilding the stack.
Q3.3Can gutters cause a damp wall?
Cast iron and plastic gutters alike clog with leaves and moss. When gutters overflow, water soaks the wall top and the eaves timbers. A leak that shows inside a bedroom wall may begin a metre away on the roof, so we trace it with a torch and photographs, working from the ceiling stain back up the slope. Details of our approach are on the roof repairs page.
A written quote follows the survey, with the cause named and the fix priced, with the survey photographs attached, which show each defect as it is on your roof. If a small repair will cure it, that is the quote you get, not a larger job. Every site is cleared at the end, and the workmanship carries our 10-year written guarantee.