Scottish Borders · Scotland
External Mastic in Boleside
External mastic for Boleside, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rigid filler in a joint that should flex
- Failed seals between different materials
- Sealant pulling away from one side of the joint
External mastic in Boleside
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. Common call-outs are for joints where the bead has come unstuck and leaking joints around cladding and façade panels, across concrete & block, copings & trims and façade panels.
External sealant needs dry surfaces, so outdoor work around Boleside is planned around the weather, and longer journeys are planned in advance. Let us know about access to every wall and roofline.
Every job comes with a one-year guarantee, wherever you are in the Scottish Borders.
- Place
- Boleside (TD1)
- Region
- Scottish Borders
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
DIY sealant or a professional job?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
When to call us in Boleside
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
Common reasons people contact us are:
- Leaking joints around cladding and façade panels
- Plants rooting in failed movement joints
- Joints pointed up with cement by mistake
- Damp patches traced to an open external joint
For site and facilities teams at buildings such as Galashiels Academy, its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- How the surfaces are prepared before sealing
- Which colour the sealant will be
- Which sealant they’ll use, and why
- What the cure time is
How it works
We keep the work tidy and contained to the joints we’re treating, so you can get on with your day. The job usually takes a few hours for a handful of joints, longer for a whole elevation, and we tell you how long to leave it before we go. Outdoor work around Boleside depends on the weather, as sealant needs a dry surface, so an outdoor job can move if the forecast changes. Indoor work goes ahead whatever the weather.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Keep children and pets away from the work area
- On commercial sites, let us know about site rules
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
Related advice
Looking after it afterwards
Looking after new joints is easy:
- Keep water from gutters off the wall
- Look over the joints every year, ideally after winter
- Never let anyone fill a movement joint with mortar
- Clear growth from the base of walls and joints
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
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.
Landlords, agents and businesses in Boleside
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Letting agents and landlords in Boleside can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
What external mastic looks like in Boleside
Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and sound outside sealant is part of that. Harled (roughcast) walls are common in Scotland, and joints where harling meets other materials need a sealant that can grip and flex.
For landlords with property near Galashiels station, outside joints that have cracked can let damp into a rental, so check them between lets. Peel House, about 4 miles west, is one of the historic houses in the wider area around Boleside, and older homes nearby need a sealant that suits their walls.
Boleside is about 2 miles south of Galashiels, in the Scottish Borders. We carry out external mastic for householders, landlords and businesses in Boleside, as part of our work across the Scottish Borders. Our area takes in 89 places across the Scottish Borders, from the larger towns to small villages. Our Edinburgh page covers work nearby (29 miles or so).
Here we cover the TD1 postcode area for external mastic. Other places close to Boleside include Tweedbank (2 miles north-east), Galashiels (2 miles north), Langlee (2 miles north-east), Darnick (2 miles east) and Melrose (3 miles east). We also work in nearby towns such as Hawick (12 miles south), Kelso (14 miles east), Selkirk (3 miles south-west), Jedburgh (13 miles south-east), Wilton (11 miles south) and Innerleithen (10 miles west).
Local landmarks in Boleside
Boleside’s nearest station is Galashiels station, roughly 1.8 miles north. Other landmarks nearby include Borders General Hospital (2.3 miles east) and Old Gala House (1.6 miles north). Green spaces nearby include Eildon Mid Hill and Haining Loch.
Boleside questions
I let a flat near Galashiels station. Can you help?
Yes, landlords and agents are among the people we work for. Just email us at info@mrmastic.co.uk with the address and what needs doing, and we’ll give you a clear price.
Do you cover Boleside for external mastic?
Yes. We work across all of Scotland, and Boleside is part of that. Just email us at info@mrmastic.co.uk with a few details of the job, and we will give you a clear quote.
Can you seal joints between render and window frames?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. We pick a colour that works with both materials.
Can I add another job to the visit?
Of course. Doing several areas at once is generally more efficient.
Are you fully insured?
Yes. We are fully insured.
Why is there a gap in my brick wall?
Most straight vertical gaps in brickwork are movement joints. It gives the wall room to move, and it should be sealed with a flexible sealant.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Towns and villages near Boleside
More services for Boleside
What the job involves on each surface
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joints work hard every day. The sealant is chosen with that in mind.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so its sealant has to stay flexible.
Leave it or put it right?
Resealing a run of joints in one go is usually better than patching one at a time. Joints of the same age tend to fail together and it means sorting access once. Around Boleside, water from a failed joint in an older stone home can soak into timber and plaster.
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first and give you a clear price before work begins.
Why Boleside clients choose us
- Sanitary silicone with an anti-fungal additive in wet areas
- We leave the area clean and tidy
- Domestic, commercial and hotel work
- Full insurance on every job