Chapter one
Flint walls and clay tiles beside the channel
Flint, red brick and clay tile make a durable pairing, but the places where they meet need a flashing cut to suit them.
The council's conservation area appraisal for Fishbourne names flint and lime as important local building materials, and lists flint, red brick and clay roof tiles among the area's key characteristics. That gives the village a particular roofing problem: a clay-tiled slope often ends against a flint wall, a chimney or a brick gable, and each of those is a join where water can enter. Flint is not a flat material. Its face is rough and uneven, so a seal that suits brick may not suit it. We look at how the lead is dressed, how well it is locked into the wall, and whether the pointing around it has cracked or dropped out.
At a glance
- The appraisal names flint and lime as local materials
- Clay roof tiles are a key local characteristic
- Flashings are locked into flint joints

1.1 Lime, flint and the flashing
A flashing is a band of lead folded over a junction to shed water. On a flint wall it is held in a chase, a groove raked out of a mortar joint, then pointed up. Because the appraisal names lime as a traditional material, we match the mortar already in the wall and avoid forcing a harder mix in beside it. Where pointing has crumbled or the lead has curled away, water runs behind the covering and appears indoors at a distance from the fault, which is why the stain is never where we begin. Lead lasts: MyJobQuote says flashing can run past 80 years, and past 100 for higher codes. A code is the lead's thickness grade, and Leadworx calls code 4 the standard for general flashing.

1.2 Clay tile and salt weather
Clay roof tiles are among the area's key materials, and a clay roof close to the harbour takes salt-laden air as well as rain. The fixings, ridge details and gutters around the tiles take the brunt of it. We check nails, clips and ridge bedding for corrosion or movement, and our ridge tile repairs page explains the fixing choices. Salt also gathers on surfaces rain cannot reach, so soffits and fascias get dirty and need rinsing, a point HomeBuilding makes about marine air. Gutters near the harbour fill with salt-stained debris, and a blocked outlet overflows onto the wall head, so we clear and test every run while we are up there. Where a slope is worn across the board, our pitched roofing page sets out what re-tiling involves.

Fig. 1 On the survey Lead curled away from a flint joint





