Scottish Borders · Scotland
Heiton External Mastic
External mastic for Heiton, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Joints pointed up with cement by mistake
- Plants rooting in failed movement joints
- Movement joints with cracked, split or missing sealant
How we handle external mastic in Heiton
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. We work on brickwork movement joints, joints between brick and frames and façade panels, and people most often call us about failed sealant between panels on a façade and joints where the bead has come unstuck.
Stone walls need a stone-friendly sealant, as acetoxy products can attack some stone. On newer homes, the movement joints and roofline trims are what need watching.
You get a 12-month guarantee, the same in Heiton as everywhere else we work.
- Where
- Heiton (TD5)
- Wider area
- Scottish Borders
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
When something else is needed
To be straight with you, there are a few things sealant won’t fix:
- Loose or hollow render, which needs re-rendering
- Adding movement joints to masonry that has none
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
Not sure which it is? You can send an email to info@mrmastic.co.uk and we will tell you honestly before you book.
Surfaces we seal
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
- Façade panels
- Concrete & block
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Heiton: your questions answered
Will you come out to Heiton?
Yes, Heiton is covered. We work across all of Scotland, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you cover Heiton for external mastic?
Yes. Our work covers the whole of Scotland, and Heiton is part of that. Just email us at info@mrmastic.co.uk with a few details of the job, and we will send you a clear quote.
Are you ARBOMaster approved?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Do you guarantee your work?
Yes, for a year. If anything isn’t right with the work within the year, let us know and we will sort it.
What’s an expansion joint in brickwork?
It’s a deliberate gap that lets the wall expand and contract without cracking. It’s sealed with a flexible sealant, not mortar.
Which products do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we will tell you what we are using.
What colours does the sealant come in?
We choose a sealant colour to suit the brick, stone or render, so the joint sits quietly in the wall. Exterior sealants come in a good range of colours.
Do you work for landlords and businesses?
Yes. We work for householders, landlords, letting agents, businesses and hotels across the Scottish Borders.
DIY sealant or a professional job?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Surface by surface
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. Where one has been mortared, we cut it out and reseal it with sealant where it can be done safely.
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. We seal the joint with a flexible exterior sealant so neither cracks the other.
Outside joints around Heiton
Plenty of Scottish homes have harled walls, and joints where harling meets other materials need a sealant that can grip and flex. Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and failed outside joints work against that.
Around Heiton, as everywhere, external mastic is only as good as the preparation behind it.
Heiton is about 14 miles east of Galashiels, in the Scottish Borders. Heiton gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. 89 places in the Scottish Borders are on our list. Edinburgh is on our list too, around 39 miles away.
Jobs for external mastic in TD5 works the same way as everywhere else we cover. Other places close to Heiton include Roxburgh (1 mile west), Kelso (2 miles north-east), Sprouston (4 miles north-east), Nisbet (4 miles south-west) and Ednam (4 miles north). Within a short drive, we also cover Galashiels (14 miles west), Selkirk (15 miles west), Jedburgh (7 miles south-west), Duns (15 miles north), Melrose (11 miles west) and Earlston (10 miles north-west).
Landmarks near Heiton
Well-known places in the area include Kelso Museum And Turret Gallery (2.2 miles north-east) and Kelso Hospital (2.5 miles north). Green spaces nearby include Peniel Heugh and Wooden Loch.
Keeping the joints in good condition
Aftercare is simple, and it makes a real difference:
- Act on the first splits you see
- Point out the joints to other trades
- Ask before painting over external sealant
- Deal with leaking gutters that soak the joints below
Don’t paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint and spoil the finish.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established, so it’s worth resealing at the first signs.
What we’re called out for in Heiton
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.
If you can see any of these, it’s time to have the joints looked at:
- Movement joints filled with mortar instead of sealant
- Plants rooting in failed movement joints
- Failed sealant between panels on a façade
- Joints where the bead has come unstuck
In the older streets around Roxburgh Parish Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
What to look for in a quote
- What happens if the job turns out different
- When the joint can take water or movement
- What insurance they hold
- How long the guarantee is
Other services in Heiton
How the visit works
The work is kept neat and contained to the area we are working on. The job generally takes a few hours to a few days, depending on the length of joint and the access, and we explain the cure time before we leave. Around Heiton, distance and access matter more than parking. Let us know how to find you and how to reach the joints, and the visit is planned around that.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Let us know about earlier repairs to the joints
- Let us know about stairs, lifts or work at height
Ask for a quote
Every job is quoted individually, so start by telling us what you need. Simply send an email to info@mrmastic.co.uk and describe the job and send photos if you have them.