South Lanarkshire · Scotland
Larkhall External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Larkhall and across South Lanarkshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Weathered mastic that no longer stretches
- Leaking joints around cladding and façade panels
- Sealant pulling away from one side of the joint
How we handle external mastic in Larkhall
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it. If you are dealing with joints pointed up with cement by mistake and moss and dirt in joints with no sealant left, we can help, whatever the surface.
In a town like Larkhall, older stone-built streets sit alongside newer estates with brick, render and uPVC rooflines. Each has its own weak points: worn joints in old gutters, and dried-out movement joints in newer walls.
Every job comes with our one-year guarantee, wherever you are in South Lanarkshire.
- Place
- Larkhall (ML9)
- Wider area
- South Lanarkshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
Honest limits
We will not take on work that won’t last, so here’s what sealant can’t put right:
- Damp that isn’t coming from the joint
- Walls that need new movement joints cut into them
- Subsidence or other structural problems
If you are not sure, just email us at info@mrmastic.co.uk and we’ll give you a straight answer before you book.
Surfaces we seal
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Façade panels
- Joints between brick and frames
- Copings & trims
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
If you’ve already had a go yourself, that is fine. We cut it out and start again.
When to call us in Larkhall
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
The problems people usually mention when they call include:
- Plants rooting in failed movement joints
- Joints pointed up with cement by mistake
- Gaps where render, brick and frames meet
- Joints with sealant missing in places
For site and facilities teams at buildings such as Larkhall Academy, larger buildings have long runs of movement joint that eventually need resealing.
What your quote should include
- Whether VAT is included
- How long the guarantee is
- Who turns up on the day
- What preparation is included
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
If you manage several properties in or around Larkhall, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
Larkhall: your questions answered
Is there a guarantee on external mastic in Larkhall?
All our work, in Larkhall and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Is Larkhall in your area for external mastic?
Yes, Larkhall is within the area we cover. We work across all of Scotland. Just drop us a line at info@mrmastic.co.uk with a few details of the job.
Can a movement joint be filled with mortar?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose. A flexible sealant is the right fill.
Can tenants book the work?
Yes, though it’s best to check with your landlord first. Landlords are often happy for the work to be arranged.
Why is there a gap in my brick wall?
Brickwork, render and cladding all move a little, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
Is it OK to seal over old sealant?
No, and we never do. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Can I do it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
What affects the quote in Larkhall
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether there’s mould to deal with
- Working hours on commercial sites
- Whether the work is at height
- How much there is to do
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please drop us a line at info@mrmastic.co.uk and we’ll talk you through it.
Helping us quote
When you contact us, these details help:
- If someone has resealed it before
- Pictures of the joints, sent by email
- Where the property is
- What the problem is, such as mould, gaps, leaks or cracking
For external mastic in Larkhall, drop us a line at info@mrmastic.co.uk. Tell us what the problem is and where, and we will agree the price before any work begins.
External mastic in Larkhall: local notes
With historic houses such as Cambusnethan House (about 1.6 miles north-east) nearby, there’s older building stock in the area around Larkhall as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that.
For an older house near a landmark such as St Machan's Parish Church, the joints between older walls, newer extensions and the roofline need a sealant that can move. Rented homes near Larkhall station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Larkhall is about 4 miles south of Motherwell, in South Lanarkshire. Whether you are in the middle of Larkhall or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our South Lanarkshire coverage runs to 139 places, Larkhall among them. Our Glasgow page covers work nearby.
Work in ML9 works the same way as everywhere else we cover. If you need external mastic at a property on Station Road, Summerhill Avenue and Marshall Street or anywhere close by, we can help. Main roads around Larkhall include the B7019 and B7078, which makes travel easy. Nearby, we also carry out external mastic in Ashgill (2 miles east), Swinhill (2 miles south-east), Dalserf (2 miles east), Gowkthrapple (2 miles north-east) and Netherton (2 miles north). Larger places within reach include East Kilbride (9 miles west), Hamilton (4 miles north-west), Cambuslang (9 miles north-west), Uddingston (7 miles north-west), Blantyre (6 miles north-west) and Carluke (5 miles east). Being one of South Lanarkshire’s larger places, Larkhall has homes, rented property and businesses of every kind.
Near you in Larkhall
In Larkhall, that means homes and buildings near Curly's Public House. Larkhall has its own railway station: Larkhall station. Nearby you will also find University Hospital Wishaw (2.8 miles north) and North Lanarkshire Heritage Centre (3.9 miles north). Open spaces near Larkhall include Strathclyde Loch and Baron's Haugh RSPB Reserve.
How the visit works
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take anything from a few hours to several days, depending on the building. In a Scottish town like Larkhall, parking is generally straightforward, though older centres can be tighter. If you are in a flat with a shared stair or a door entry system, let us know when you book.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Mention any leaks or damp you’ve noticed
- On commercial sites, let us know about site rules
- Mention any parking rules near the property
Get a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we’ll come back to you with a quote.
Advice
Places near Larkhall
What else we do in Larkhall
How the job changes by surface
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two so neither cracks the other.