Chapter 1: Slates are creeping down the roof of our old Worting house. Can they be refixed?
What we find
A slate roof is held by two nails per slate, driven through holes near the top and hidden by the course above. On a roof that has stood for a century or more, those nails have corroded. The slate then drops a few centimetres and hangs by whatever is left of the shank, leaving a visible gap in the pattern of the roof. Slates can also snap across the nail hole when the wood beneath has dried and shrunk.
From the garden, a slipped slate shows as an uneven line or a dark patch of batten. In the loft you may see a pinprick of daylight, or a damp stain on a rafter below. In wind, loose slates become a danger to anyone walking underneath, so it is worth acting before the next gale.
What we fix
We rarely need to strip a whole slope. After lifting a few slates to check the battens, we refix the sound ones and replace only those that have cracked or lost their holes. Where a nail has failed we fit a copper or stainless fixing, and slates that cannot take another nail get a tingle, a small strip of lead or copper that holds the slate by its lower edge.
The slates are matched for size, thickness and colour, using reclaimed stock where we can. Typical UK figures reported for a single slate repair are £100 to £250 for labour and a further £5 to £25 for each slate, with £300 to £800 more if a scaffold tower is needed. The wider repair and re-roof choices are on our slate roofing page, and the number you pay is the one fixed after the survey.