Slate Roofing in Airdrie

Most of Airdrie’s slate is on shared buildings, and the roof over a tenement belongs to everyone under it. The Tenements (Scotland) Act 2004 sets the ground rules where your title deeds are silent. Maintenance decisions, including roof repairs, are taken by a simple majority of owners, one vote per flat, so nobody can block essential work on their own. Costs are shared equally, unless the largest flat is more than one and a half times the size of the smallest, in which case shares follow floor area. Your own title deeds may set different shares, so read them first; a factor, if the block has one, will usually organise the vote and collect the money.

What that means in practice is that we are often asked to survey a roof for one owner and produce a report the others can rely on. We do that: a photographed condition report, a written explanation of what is urgent and what can wait, and a fixed price split into the shares the deeds require. It takes the argument out of the stair. Where one flat has a leak now and the block cannot agree yet, we can make that area safe and watertight first and come back for the full job when the vote is through. The Scottish Government’s Under One Roof guidance is a good plain-English reference if you are organising your first common repair.

Airdrie’s older roofs are built the Scottish way. A deck of sarking boards covers the rafters, and each slate is fixed with one nail through its head straight into the boards, rather than hung on battens with two nails as in England. The slates were sorted and laid in diminishing courses, largest at the eaves, and most came from Scottish quarries at Ballachulish, the Slate Islands and along the Highland Line, all closed by 1955. So matching slate today is reclaimed slate, graded to your sizes.

On a big tenement roof the nails were all driven in the same year, so when the iron finally rusts through, nail sickness arrives everywhere at once rather than slate by slate. The first sign is a run of slipped slates after a gale; the second is the number of lead tingles on the roof from past patching. When there are dozens, refixing one at a time has become a subscription rather than a repair, and the block should be planning a re-slate. The slate itself is almost always fit to go back on. Good Scotch slate comfortably passes 100 years, and these roofs are the proof. Our post on the signs your roof needs replacing lists the rest of the warning signs.

On a sandstone villa the decision is yours alone; on a tenement it is the block’s, but the logic is the same. We look at the proportion of slates that have moved, whether the slate is still hard or delaminating, the sarking from inside the roof space, and the lead and ridge. Under one in ten moved, with dry boards, is a repair at a few hundred pounds. A single nail-sick elevation, usually the one facing the weather, can be stripped and re-laid on its own for a few thousand while the rest is left alone. When the whole roof is at it, a re-slate is cheaper over ten years than the patching, and on a shared roof spreading a five-figure cost across six or eight flats makes it manageable. We show every owner the same photographs and the same numbers, and we say clearly which parts are urgent. We also say when a roof is fine and only needs a gutter cleared, because a damp patch on a top-floor ceiling is as often a water ingress problem in Airdrie from a blocked outlet as it is a slate problem.

The chimney stacks get the attention, and rightly, but on tenement and villa roofs the valleys and the lead behind them cause as much trouble. Long lead valleys between pitches, the back gutters behind big stacks, parapet gutters on flat-fronted town-centre blocks and the soakers under abutments are all the same age as the slate and were never expected to last as long. Splits along the folds and lifted edges let water in behind the slate, where it runs along the sarking and appears two rooms away. On a re-slate every piece is renewed. On a repair we test and photograph it so you know what is coming. See chimney repairs in Airdrie for the stacks themselves and how we combine the two while the scaffold is up.

Airdrie’s town-centre conservation area is defined by its sandstone and Scottish slate, and the council’s management plan encourages like-for-like repair, which suits us because it is also the right technical answer. Repairs and re-slating in matching natural slate need no consent; changing the covering to tile or fibre-cement, or altering the roofline, is likely to need planning permission from North Lanarkshire Council, and listed buildings need listed building consent. We source reclaimed Scotch slate for repairs, re-use your own slates when re-slating, and bring samples of Spanish and Welsh slate where a new roof is being specified so you can compare. For more on how we grade slate and what the different types cost, see our main slate roofing page.