Dumfries and Galloway · Scotland
External & façade joints in Gelston, Dumfries and Galloway
Sealing brickwork movement joints, render, cladding and façade joints in Gelston, with a one-year guarantee on every job. Ask us for a quote.
- Rain getting behind render or cladding at a joint
- Failed sealant between panels on a façade
- Joints pointed up with cement by mistake
Landlord and commercial work in Gelston
We work for landlords and letting agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
About our external mastic in Gelston
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. We work on render & cladding joints, brickwork movement joints and concrete & block, and people most often call us about movement joints filled with mortar instead of sealant and moss and dirt in joints with no sealant left.
In and around a place like Gelston, many buildings face open ground and take the full weather. Outside joints on exposed walls work hard.
Our work is backed for twelve months, in Gelston and everywhere else we cover.
- Location
- Gelston (DG7)
- Region
- Dumfries and Galloway
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
How we quote for external mastic
Jobs vary more than people expect. The main factors:
- Access and height
- Whether there’s mould to deal with
- The number of rooms or windows
- The old material and how stubborn it is
What it costs depends on the amount of work, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins.
What we need to know
When you contact us, it’s useful to know:
- If it’s domestic, commercial or a hotel
- The rough size of the job
- How we’d reach the joints
- What the problem is, such as mould, gaps, leaks or cracking
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
What the job involves on each surface
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant so the movement is taken up.
Render joints
Render is weaker at the surface than brick, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Questions from Gelston
Is external mastic in Gelston guaranteed?
All our work, in Gelston and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
Will you come out to Gelston?
Yes. Gelston is within the area we cover, which takes in towns, villages and rural addresses. We work across all of Scotland. Just mention lanes, gates or anything else about the route when you book.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Which products do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we’re using and why.
Does someone need to be in?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Will it make a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Can I add another job to the visit?
Yes. Several rooms, windows or areas can go on one quote.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Aftercare tips
To keep the joints looking good and working properly:
- Check the sealant is paintable before painting near it
- Tell anyone working on the walls about the movement joints
- Clear growth from the base of walls and joints
- Deal with leaking gutters that soak the joints below
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
Once a joint can’t move, the wall finds another way, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
Places near Gelston
What else we do in Gelston
External mastic in Gelston: local notes
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. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and sound outside sealant is part of that.
In the older streets around Kirkland Of Gelston, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Gelston is about 17 miles south-west of Dumfries, in Dumfries and Galloway. Every kind of property in Gelston is covered for external mastic. The work is guaranteed for a year. 138 places in Dumfries and Galloway are on our list. For nearby work, see our Glasgow page, about 67 miles away.
Jobs for external mastic in DG7 works the same way as everywhere else we cover. Local streets include Douglas Terrace and Douglas Crescent, all of which we cover. Nearby, we also carry out external mastic in Kelton Hill (2 miles west), Castle Douglas (2 miles north), Bridge of Dee (2 miles west), Palnackie (3 miles east) and Dalbeattie (4 miles north-east).
What’s near Gelston
A little further out are Gelston Castle (0.5 miles east) and Castle Douglas Art Gallery (2.4 miles north). Not far away are Carlingwark Loch.
Common problems we fix in Gelston
A lot of failed joints come down to preparation: 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.
Most people get in touch when they notice something like this:
- Movement joints filled with mortar instead of sealant
- Panel joints letting water in
- Joints with sealant missing in places
- Moss and dirt in joints with no sealant left
Around Gelston, as everywhere, external mastic is only as good as the preparation behind it.
Comparing quotes
- Who turns up on the day
- How the joint is cleaned and prepared
- What insurance they hold
- What happens if they find a problem under the old sealant
The process
You don’t need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the work takes anything from a few hours to several days, depending on the building in most cases. Outdoor work around Gelston depends on the weather, as sealant needs a dry surface, so external jobs may need to move if the day turns wet. Indoor work goes ahead whatever the weather.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Mention any sign-in or site rules at work premises
- For indoor joints, keep the area dry beforehand if you can
- Let us know about parking restrictions
Ask for a quote
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand.