Scottish Borders · Scotland
Newtown St Boswells External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for Newtown St Boswells, backed by a one-year guarantee. Call for a quick quote.
- Old sealant gone brittle and cracked
- Cracked joints where brick meets render or frames
- Joints where the bead has come unstuck
Why deal with it now?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost, so the problem grows beyond the joint itself. When the nearest tradesperson is a drive away, it’s tempting to leave a small leak, but water through a failed joint keeps working away until it’s fixed.
The cost depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
Why choose Mr Mastic in Newtown St Boswells
- Colour picked to suit the job
- Colour agreed with you before we start
- Homes, businesses and hotels
- White, clear, grey or another colour, product permitting
Take a look at what affects the cost or our reviews.
External mastic for homes and businesses in Newtown St Boswells
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement where mortar or filler would crack. If you’re dealing with joints pointed up with cement by mistake and plants rooting in failed movement joints, we can put it right, whatever the surface.
Older stone buildings need a sealant that suits the stone, not an acetoxy product that can mark or attack it. Newer houses need their movement joints and roofline trims kept sound.
There’s a 12-month guarantee on every job, large or small.
- Location
- Newtown St Boswells (TD6)
- Region
- Scottish Borders
- Cover
- One year on every job
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Towns and villages near Newtown St Boswells
Other services in Newtown St Boswells
Different surfaces, different methods
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that is happened, we rake it out and reseal it properly.
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
How to look after the new joints
Looking after new joints is easy:
- Deal with leaking gutters that soak the joints below
- Keep high-pressure jets off the joints
- Don’t let climbing plants root in the sealant
- Show decorators and builders where the movement joints are
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead and let water in behind.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Common questions in Newtown St Boswells
Will you come out to Newtown St Boswells?
Yes, smaller places are covered as well as towns. Our work covers the whole of Scotland. Just mention lanes, gates or anything else about the route when you book.
Is Newtown St Boswells in your area for external mastic?
Yes. We work across all of Scotland, and Newtown St Boswells is part of that. Just email us at info@mrmastic.co.uk with a few details of the job, and we’ll send you a clear quote.
Can you seal joints between two different materials?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides, primed where needed.
How often do external joints need resealing?
That varies with the weather the wall faces, how much it moves and the sealant used. Treat it as a maintenance item and look at it yearly and renew it when it starts to fail.
What colours does the sealant come in?
We aim for a joint that suits the wall rather than one that jumps out. Colour is agreed with you before we begin from the range available.
Do I have to be there?
That depends on where the joints are. Inside work needs someone to give us access, and for outside work we’ll agree access with you when we book.
How do you reach high-level joints?
It depends on the building. Where joints can be reached safely, we’ll do them. Tell us about the building and we will confirm what access is needed.
Can tenants book the work?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
Do you need external mastic in Newtown St Boswells?
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
Keep an eye out for these signs:
- Gaps where render, brick and frames meet
- Weathered mastic that no longer stretches
- Water getting into walls through failed joints
- Movement joints with cracked, split or missing sealant
Letting a property close to Tweedbank station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Questions to ask before booking
- Whether all the old sealant comes out first
- How much experience the applicator has
- Whether the sealant suits the joint
- How the joint is cleaned and prepared
Newtown St Boswells buildings and the weather
Under the Repairing Standard, private landlords in Scotland have to keep homes 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.
Managing a site like Newtown Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Newtown St Boswells is about 6 miles south-east of Galashiels, in the Scottish Borders. We carry out external mastic for householders, landlords and businesses in Newtown St Boswells and the surrounding area, as part of our work across the Scottish Borders. Newtown St Boswells is one of 89 places in the Scottish Borders we cover for external mastic. Edinburgh is on our list too, about 33 miles from Newtown St Boswells.
Postcode districts we cover here for external mastic: TD6. Whether your property is on Park Avenue, Park Crescent and Roxburghe Place or anywhere close by, our applicators can take on the job. Close by, we work in Bowden (1 mile south-west), St Boswells (1 mile east), Newstead (2 miles north-west), Greycrook (2 miles south-east) and Melrose (2 miles north-west). Within a short drive, we also cover Galashiels (6 miles north-west), Hawick (11 miles south), Kelso (10 miles east), Selkirk (7 miles west), Jedburgh (8 miles south-east) and Wilton (11 miles south-west).
Landmarks near Newtown St Boswells
The nearest railway station is Tweedbank station, roughly 3.7 miles north-west of the centre. Other landmarks nearby include Castle Holydean (2.5 miles south-west) and Commendators House Museum (2.2 miles north-west). Open spaces near Newtown St Boswells include Bemersyde Moss and Eildon Hill North.
What we can’t put right
We will always be straight with you, so here’s what new sealant will not do:
- Failed render or damaged cladding panels
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Walls that need new movement joints cut into them
If in doubt, drop us a line at info@mrmastic.co.uk and we’ll say what we think.
What we seal
- Copings & trims
- Façade panels
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
DIY versus a professional finish
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.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
The process
Once we’re on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours to a few days, depending on the length of joint and the access. Outdoor work around Newtown St Boswells 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.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Mention if the joints have been sealed before
- For business premises, tell us about site rules or sign-in
How to get a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To arrange one, email us at info@mrmastic.co.uk.