Chapter 1: Why are clay tiles slipping on our cottage near London Road in Kings Worthy?
What we find
Plain clay tiles are small and hang in overlapping courses from timber battens, each held by a nib on its top edge and, in most courses, by a nail or a wooden peg. On a roof that has been there for generations, the nails have corroded and the pegs have rotted. Roofers call the result nail sickness. The tile is still sound but nothing holds it, so one slips and its neighbours follow.
The signs are a tile sitting lower than its row, a line of small gaps, or fragments on the ground. Frost can also flake the faces of softer old tiles, and moss on the north slope holds the damp against them. In the loft you may see a pinpoint of light through a missing tile or a stain on the underside of the boarding. The tile gauge on old roofs often varies, which makes replacement tiles harder to match.
What we fix
We take off just the failed section, keep every tile that is still good, and replace the rest with reclaimed or handmade plain tiles chosen to match in colour and curve. The battens beneath are checked, and any that have gone soft are renewed. The tiles are then fixed with nails that will not corrode, so the same fault does not return in a decade.
Because the street scene counts here, we recommend repair over replacement for this kind of roof, and we keep photographs of the before and after for your records and for the council. Typical UK prices for a re-roof in natural slate run from £120 to £180 per square metre, which is a useful comparison if the whole roof has to be considered; your fixed quote follows the survey. Our pitched roofing page sets out the options.