Chapter 1: Do we need consent to repair the clay tile roof of our listed house in Winslade?
What we find
Old plain clay tiles are hand-made, slightly cambered and softer than modern ones, and after two or three centuries they fail in particular ways. The face flakes where frost has got into the clay, the nibs that hook the tile over the batten break, and the tiles slip. Under the covering, many old houses were torched: lime mortar was pushed into the underside of the tile laps from inside the loft to stop wind-blown rain and snow. When that mortar falls you get grit on the loft floor and a draught through the roof.
The signs outside are a patchy surface where tiles have been replaced in different colours, a slope that sags where battens have rotted, and a wavy ridge. Inside, daylight through the roof or a dark stain on an old rafter is worth acting on, because old timber that is wetted for long enough will rot, however tough it was when it was felled.
What we fix
Because Winslade has so many listed buildings, our first step is to photograph the whole roof and mark what is original. Sound tiles stay. Failed ones are replaced with reclaimed or hand-made tiles matched for colour and camber, and any rotten battens are renewed as the work goes. Torching is made good in lime where it has fallen, not replaced with foam or felt that would trap damp against old timber.
Repair that matches what is there is normally acceptable on a listed house, but swapping materials or altering the look may need listed building consent, so we give you the photographic survey to take to the conservation officer at Basingstoke and Deane before work starts. On roofs like this, repair comes first almost every time. Our pitched roofing page explains how a larger re-lay would run if it ever came to that.