West of Scotland, Lanarkshire
Dry rot, wet rot and woodworm in Lanarkshire
Lanarkshire is not a smaller Glasgow. The stock here is mostly twentieth century, much of it stands on ground that has been mined, and the timber fails in its own way because of both.
- We look before we priceNo quote without a survey
- Written reportSomething a lender will accept
- West of Scotland onlyGlasgow to Ayr and Stirling
There are two Lanarkshires as far as timber decay is concerned, and it is worth knowing which one your house is in before anybody looks at it. The first is the old industrial corridor down the Clyde valley: Motherwell, Wishaw, Bellshill, Hamilton, Coatbridge and Airdrie, towns that grew fast around coal, iron and steel and that still carry a core of Victorian and Edwardian sandstone inside a much larger ring of twentieth century housing. The second is the newer south and west, above allEast Kilbride, where building did not really start until after the war and where a pre-1919 property is genuinely rare.
That distinction matters because almost everything written about rot in the west of Scotland is written about Glasgow tenements, and most of it does not apply here. Joist ends buried in solid sandstone, wallhead gutters, common closes and shared roofs are the Glasgow story. In most of Lanarkshire the house has its own roof, its own gutters and a cavity wall, and water reaches the timber by a completely different route.
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The ground under Lanarkshire does more damage than the rain
This is the part that gets missed. Lanarkshire sits on a worked-out coalfield, and large parts of it are built on ground that has been mined, tipped, levelled or filled at some point in the last two centuries. None of that rots timber on its own. What it does is move drains.
A drain pulled slightly out of line no longer carries water away, it carries water sideways into the ground beside a wall. A gully that has settled an inch below the surface it was set into starts discharging against the base of the building instead of into the pipe. A path or driveway that has sunk towards the house sends every downpour at the wall rather than away from it. Each of those puts masonry into permanent saturation, and a permanently wet wall is what the suspended timber floor inside it cannot survive indefinitely.
So when a surveyor arrives here and spends the first ten minutes outside looking at gullies, downpipe shoes and the fall on the driveway before going anywhere near the floor, that is not avoidance. The wet timber is the symptom, and in this county the cause is very often at ground level and outdoors.
Four kinds of building, four different failures
Victorian and Edwardian sandstone, in the town centres
Tenement and terrace in the older parts of Motherwell, Hamilton, Wishaw, Coatbridge, Airdrie and Lanark. Solid walls, no cavity, no damp proof course, and floor joists built into the stone exactly as they are in Glasgow. This is where the dry rot is, and it behaves the way it does in the city: it starts with water arriving from above through failed rainwater goods, then travels along and through masonry looking for more timber. If your building is in this category, theGlasgow dry rot page describes your problem more accurately than the rest of this one does.
Miners’ rows and early interwar terraces
Low, long, often single storey, and frequently altered beyond recognition. What survives of this stock has usually had a new roof, new windows and a rear extension at some point, and the decay we find is almost always at the junctions between the old building and the newer work. Where an extension roof was tied into an old wall without a proper upstand and flashing, water runs behind it. That is wet rot in the making, and it stays invisible from inside until the plaster goes.
Interwar and post-war local authority housing
The largest single category in Lanarkshire by a distance. Roughcast semi-detached and terraced houses, cavity walls, hipped roofs, and a suspended timber ground floor over a ventilated void. The void is the whole story. It works perfectly for as long as air can move through the airbricks at the base of the wall, and it stops working the moment those are blocked. Airbricks here disappear behind three things in particular: a monoblock driveway laid up to the wall, a raised garden bed, and external wall insulation fitted without the vents being sleeved through it.
Post-war non-traditional and later timber frame
Concrete panel and no-fines concrete housing appears across the county, and from the nineteen seventies onward so does timber frame. Neither is a problem in itself. Both carry a much higher proportion of hidden timber than an older house does, and both punish a small persistent leak harder than a solid wall would, because the water reaches structural timber sooner and dries more slowly once it is in there.
Woodworm is more common in Lanarkshire than most people expect.A lot of roof and floor timber put into houses here between the nineteen fifties and the nineteen seventies was untreated softwood, which is what the common furniture beetle prefers. That does not mean every loft in the county needs treating. Most of what we are shown is old, finished damage with nothing living in it, andtelling active woodworm from historic holes is something you can start on yourself with a torch. It does mean that if the holes are clean, pale and accompanied by fresh dust, it is worth taking seriously rather than assuming the loft is too new to have a problem.
Where the shared repair problem does and does not apply
In a Glasgow tenement almost every rot job runs into common property sooner or later, because the roof and the rainwater goods belong to the whole building. Across most of Lanarkshire that does not arise at all. A semi-detached house has its own roof and its own gutters, and the owner can commission the work without asking anybody.
The exceptions are worth naming, because they catch people out. Terraced housing frequently shares a gutter run and sometimes a roof structure with the neighbours. Four-in-a-block flats, which Lanarkshire has in very large numbers, share a roof between four owners and fall under the same Scottish tenement rules a city tenement does. And on former council estates the local authority or a housing association often still owns some of the flats in a block, which means one of the parties whose agreement you need is an organisation with its own repairs process and its own timetable.
Towns we are called to most
The West of Scotland team covers the whole county. These are the areas with enough character of their own to be worth reading about separately:
- Motherwell, with Wishaw and Bellshill: steel town terraces, interwar semis and a great many buried airbricks.
- Coatbridge and Airdrie, the Monklands: ironworks ground, the canal, and cellars where you would not expect them.
- East Kilbride: a new town, and the least Glasgow-like building stock anywhere in the West.
Hamilton, Blantyre, Uddingston, Cambuslang, Rutherglen, Larkhall, Carluke and Lanark are all covered on the same terms. If you are unsure whether you are inside the patch, the honest test is your postcode: everything in ML is Lanarkshire and is ours, and theWest of Scotland page sets out the rest.
What to do next
If you know which problem you are looking at, go straight to it:dry rot,wet rot orwoodworm. If you do not, which is the usual position, book atimber survey and let somebody look at all three in one visit. Nobody can tell you which of them you have from a photograph, and in this county a fair proportion of the answer is outside the building anyway.
Questions we get from Lanarkshire
Is timber decay in Lanarkshire really different from Glasgow, or is that just marketing?
It is genuinely different, and the reason is the housing stock rather than the weather. Glasgow is dominated by pre-1919 sandstone tenement, where the classic job is a joist end rotting inside a solid wall fed by a shared gutter. Lanarkshire has far less of that and far more interwar and post-war housing built with cavity walls, suspended timber ground floors and, from the sixties onward, roof timber that was often not pre-treated. The same three organisms turn up, but they turn up in different parts of the building, and the shared repair problem that dominates a tenement job barely applies to a semi with its own roof.
The house is over old mine workings. Does that have anything to do with rot?
Not directly, but it is worth knowing about, because the connection runs through the drains. Ground movement over former workings cracks underground drainage and displaces paths and driveways, and a cracked drain or a gully that no longer falls the right way puts water against a wall for years without anything visible happening indoors. By the time it shows as soft skirting or a musty smell in a floor void, the cause is under the garden. If you have a mining report from your purchase, mention it at the survey, because it changes where somebody looks first.
Our estate was council-built and we bought it years ago. Does that change anything?
It changes the age profile more than the technical picture. A great deal of Lanarkshire housing was built by the local authority between the nineteen thirties and the nineteen seventies and sold into private hands under right to buy from 1980 onward. That stock is now old enough for original roof coverings, rainwater goods and windows to be at or past the end of their service life, all at roughly the same time. Where a whole street reaches that point together, we tend to get called to several houses on it within a couple of years.
Which of the three is most common here?
Wet rot, by a clear margin. It follows a specific leak and it stays where the water is, which makes it the cheaper problem to put right provided the leak is dealt with as part of the job. Dry rot turns up mainly in the older sandstone terraces and tenements in the town centres. Woodworm is the one that surprises people, because post-war roof and floor timber was frequently untreated softwood and Lanarkshire has an enormous amount of exactly that.
Do you charge more to come out to Lanarkshire than to Glasgow?
No. Lanarkshire is inside the core patch for the West of Scotland team rather than at the edge of it, so Motherwell, Wishaw, Hamilton, Bellshill, Coatbridge, Airdrie and East Kilbride are routine rather than a special trip. Where the wait genuinely does get longer is the far edges of the county, out towards Lanark, Carluke and Biggar, simply because there are fewer visits out that way to attach a new one to.
Book a survey
Three questions. You do not need to know which problem you have.