Chapter 1: Why have tiles slipped on the steep clay roof of our cottage near Westbrook Green?
What we find
Handmade plain clay tiles are thin and slightly curved, and each one hangs from two small nibs (projections on the back) over a timber batten. On an old, steep roof they are also held by a pair of nails, or wooden pegs. As the fixings corrode or the batten softens, a tile slips down by a few millimetres, lets the one below it loosen, and eventually falls. Frost then splits the face of any tile that has absorbed water.
The roof may look fine from the lane while the problem builds underneath. Check the garden after a gale for tile fragments, and look at the hips and valleys, where the cut tiles are most exposed. If the loft shows daylight where no daylight should be, or the underside of the tiles has darkened, water has been getting in.
What we fix
We take off only the area that has failed, keep every sound tile, and make good with reclaimed or handmade plain tiles chosen to match the colour and curve. Rotten battens are renewed, and tiles go back with stainless or copper fixings rather than the old nails. Hips and valleys are rebuilt carefully, and the ridge is bedded or dry-fixed in a way that suits the conservation area.
A cottage in plain clay is priced on its roof area and the tiles chosen, and the published range for a concrete-tile semi, £6,500 to £10,500, is only a loose guide; your fixed quote follows the survey. Before changing the type of tile, check with Waverley. Our pitched roofing page explains the work.