Chapter 1: Can the clay tiles on our listed house in Aldermaston be repaired instead of replaced?
What we find
Plain clay tiles on a house of this age are hung over timber battens (the thin laths the tiles hook onto), and each tile is held by a nib at the top and sometimes by a nail or a peg. Over a couple of centuries the nails corrode and the pegs rot, so tiles creep down their courses and drop out one at a time. The surface of a soft tile also flakes in frost, which shows as orange dust in the gutter and small bare patches on the slope.
You may also see sagging between rafters or a dip in the ridge line. On an old frame that is often just the roof having settled gradually, and it does not mean the timbers are failing. We look from the loft as well as the outside, because daylight through the tiles and dark staining on the underside of the battens tell us where water has been getting in.
What we fix
On a listed house the starting point is repair, and the roof usually supports that. We strip only the area that has failed, set aside every tile that is sound, and make up the gaps with reclaimed plain clay tiles matched for colour and curve, so that the repair does not stand out from the street. New battens go in under the stripped section and the tiles are fixed with stainless steel nails or clips instead of being hung back on the old corroded ones.
Where the underlay has gone, we add a breathable membrane (a sheet that lets moisture vapour out while keeping rain off) under the replaced section. Because the house is listed, we recommend you ask West Berkshire Council whether the work needs consent before ordering anything, and we supply the photographs to go with that conversation. A single slate or tile repair is typically priced at £100 to £250 labour plus £5 to £25 for the material, with access equipment on top; your fixed quote follows the survey. Our pitched roofing page explains how these repairs are built up.