South Lanarkshire · Scotland
External & façade joints in Lesmahagow, South Lanarkshire
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Lesmahagow and across South Lanarkshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Leaking joints around cladding and façade panels
- Rigid filler in a joint that should flex
- Water getting into walls through failed joints
External mastic in Lesmahagow
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. We work on façade panels, copings & trims and render & cladding joints, and the jobs we see most are panel joints letting water in and sealant pulling away from one side of the joint.
Older stone buildings need a sealant that suits the stone, not an acetoxy product that can mark or attack it. On newer homes, the movement joints and roofline trims are what need watching.
There’s a 12-month guarantee on every job.
- Where
- Lesmahagow (ML11)
- Wider area
- South Lanarkshire
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
When to call us in Lesmahagow
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The new sealant then lets go long before it should.
People normally contact us when they notice one of these:
- Water getting into walls through failed joints
- Joints pointed up with cement by mistake
- Weathered mastic that no longer stretches
- Weeds or debris growing in open joints
Schools such as Lesmahagow High School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Comparing quotes
- Is VAT in the price?
- What insurance they hold
- How the surfaces are prepared before sealing
- How the colour is chosen
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Nearby places to Lesmahagow
More services for Lesmahagow
Landlords, agents and businesses in Lesmahagow
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
We work for landlords and letting agents as well as householders. Resealing between tenancies keeps a property looking cared for.
What the job involves on each surface
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. We reseal their joints with backing rod and a flexible product.
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. Each is resealed with a weatherproof, flexible sealant.
Why it’s worth doing now in Lesmahagow
Sealing over the top of old mastic doesn’t hold for long. The new layer can’t bond properly to old, weathered material, so the old joint is cut out fully first. In a place like Lesmahagow, small leaks are easy to put off, but water through a failed joint keeps working away until it’s fixed.
What it costs depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before any work starts, so you know where you stand.
Why book with us
- Rated 4.9 stars on Google
- Experience in homes, commercial sites and hotels
- Every job guaranteed for a year
- We agree the colour with you first
See our cost guide and our reviews.
Common questions in Lesmahagow
Can you do external mastic in Lesmahagow?
Yes, Lesmahagow is within the area we cover. Our work covers the whole of Scotland. You can send an email to info@mrmastic.co.uk and tell us what needs doing, and we’ll give you a clear price.
Is external mastic in Lesmahagow guaranteed?
All our work, in Lesmahagow and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
When will the joints need doing again?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Every job carries our 12-month guarantee.
Where do you work from?
We work from Crawley. We cover Lesmahagow and the rest of South Lanarkshire, along with the rest of our area.
Do you work at height?
That depends on how high the joints are and the ground below. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Do the sealants smell?
Some sealants have a smell while they cure, but it fades. Ventilation helps.
Aftercare tips
So the new joints stay in good condition:
- Get split or bare joints resealed while the damage is small
- Keep high-pressure jets off the joints
- Show decorators and builders where the movement joints are
- Check external joints each spring
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint and spoil the finish.
A joint that has stopped moving pushes the movement elsewhere, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
What external mastic looks like in Lesmahagow
Plenty of Scottish homes have harled walls, and where harling meets frames, pipes and other materials, the joint needs a flexible sealant that grips a rough surface. Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and failed outside joints work against that.
For an older house near a landmark such as Lesmahagow Old Parish Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Lesmahagow is about 7 miles south of Carluke, in South Lanarkshire. For external mastic in and around Lesmahagow, it’s easy to get a quote: please send an email to info@mrmastic.co.uk. We’re based in Crawley and cover South Lanarkshire. 139 places in South Lanarkshire are on our list. There’s also a page for Glasgow, roughly 21 miles from Lesmahagow.
We work across ML11 for external mastic. We cover properties on Station Road, Abbeygreen and Cordiner Road and the roads around them. If you are just outside Lesmahagow, we cover Brocketsbrae (1 mile east), New Trows (1 mile south), Devonburn (1 mile south-east), Dillarburn (1 mile north-east) and Auchenheath (2 miles north). Larger places within reach include East Kilbride (15 miles north-west), Hamilton (11 miles north-west), Uddingston (15 miles north-west), Blantyre (13 miles north-west), Larkhall (8 miles north-west) and Carluke (7 miles north).
Near you in Lesmahagow
Other landmarks nearby include Craignethan Castle (4 miles north) and Birkwood Castle (within half a mile south). The countryside around Lesmahagow includes Black Hill.
What happens on the day
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes a few hours to a few days, depending on the length of joint and the access from start to finish. Somewhere like Lesmahagow may be a longer drive, and the journey is planned ahead. Tell us about tracks, gates, a ferry crossing or anything unusual about getting there.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about earlier repairs to the joints
- Clear the area around the work
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you’re ready, drop us a line at info@mrmastic.co.uk.