Chapter 1: Why do slates keep slipping off our Victorian house near Fleet High Street?
What we find
A slate is held by just two nails, driven near its top edge into a timber batten (the thin strip fixed across the rafters). On a roof laid in the later 1800s, those nails were often iron, and iron rusts. Over a century or more the nail shank thins, then snaps, and the slate drops a few centimetres and hangs on its neighbour. This is called nail sickness, and one slipped slate on a roof of this age usually means more are loose.
You may see slates sitting out of line, small fragments on the path, or the odd gap on the slope. In the loft, look for daylight at a gap or a dark stain on the rafter below. Old slates also delaminate, splitting into thin layers, and broken pieces left on the roof channel rain under the courses above.
What we fix
We lift a representative area first, to see whether the slates are sound and the nails alone have failed. Where the slate is good, we re-fix it with copper or stainless nails, or with clips for slates that have lost their nail holes, and bed replacements to match. Where an area is past saving, we strip it, check the battens and felt below, and relay with reclaimed slate in the same size and colour.
Single slate repairs are priced separately from bigger sections. Typical UK figures run £100 to £250 in labour and a slate costing £5 to £25 on top, with a tower or scaffold adding £300 to £800, and you get a fixed quote once we have surveyed. If the roof is failing across the board, our slate roofing page covers a full re-slate.