Highland · Scotland
External & façade joints in Strontian, Highland
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Strontian and across Highland. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Gaps where render, brick and frames meet
- Old sealant gone brittle and cracked
- Water getting into walls through failed joints
Why deal with it now?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. Out of town in Scotland, exposed walls take a lot of weather, and damp in stone or harled walls takes a long time to dry once water gets behind a joint.
Doing several joints on one visit normally makes better use of the time than several visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Why book with us
- Old sealant always removed completely
- Every job guaranteed for a year
- We leave the area clean and tidy
- An ARBOMaster approved applicator
See what affects the cost and our reviews.
External mastic for homes and businesses in Strontian
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where mortar or filler would crack. Common call-outs are for rain getting behind render or cladding at a joint and hard, crazed mastic that has stopped moving, on render & cladding joints, façade panels and copings & trims.
Older stone buildings need a sealant that suits the stone, not an acetoxy product that can mark or attack it. On newer homes, the movement joints and roofline trims are what need watching.
The work is covered for a year after we finish. If there’s a problem with it, please email us at info@mrmastic.co.uk.
- Location
- Strontian (PH36)
- Wider area
- Highland
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
External mastic in Strontian: local notes
Strontian is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on movement joints and outside wall joints, especially on the side facing the sea. The west of Scotland is wetter than the east, which means movement joints and outside wall joints has to cope with a lot of rain.
Around Strontian, as everywhere, external mastic is only as good as the preparation behind it.
Strontian (Gaelic: Sron an t-Sithein) is in Highland. Anywhere in PH36, we can carry out external mastic at your property. 253 places in Highland are on our list. For nearby work, see our Glasgow page, about 76 miles away.
Work in PH36 works the same way as everywhere else we cover. Local streets include Dal nan Each and Dal na Mart. Neighbouring places we cover for external mastic include Acharacle (9 miles west), Ceann Loch Muideart (9 miles north-west), Port Appin (12 miles south-east), Appin (12 miles south-east) and Balliveolan (12 miles south). Remote and island addresses need a little more planning, so please mention your location when you send an email to info@mrmastic.co.uk.
Landmarks near Strontian
Not far away are Loch Doilet.
Strontian: your questions answered
Do you cover Strontian for external mastic?
Yes, Strontian is within the area we cover. Our work covers the whole of Scotland. Just drop us a line at info@mrmastic.co.uk with a few details of the job.
Does living near the coast affect external mastic in Strontian?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. It’s worth checking the walls that face the sea first.
Do you guarantee your work?
Yes. Every job comes with a one-year guarantee.
How do you reach high-level joints?
It depends on the building. Tell us the height, the number of joints and what’s below them and we will confirm how they can be reached safely.
Can you match the colour of my brickwork?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We pick the one that suits your wall best so the joint doesn’t draw the eye.
What is a movement joint?
It’s a deliberate gap that lets the wall expand and contract without cracking. It should be filled with flexible sealant, never mortar.
Is it messy?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Where do you work from?
Mr Mastic is based in Crawley. We cover Strontian and the rest of Highland.
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Keep high-pressure jets off the joints
- Leave the joints unpainted unless we have said otherwise
- Walk round the building once a year and look at the joints
- Show decorators and builders where the movement joints are
Follow the cure time we give you before the joint is knocked or disturbed. Most exterior sealants skin fast but take longer to cure right through.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years so early resealing is worth it.
Also near Strontian
Also in Strontian
Honest limits
It helps to know what we cannot do too:
- Adding movement joints to masonry that has none
- Failed render or damaged cladding panels
- Structural movement, which needs a surveyor or engineer
If in doubt, email us at info@mrmastic.co.uk and we will say what we think.
Surfaces we seal
- Concrete & block
- Render & cladding joints
- Brickwork movement joints
- Façade panels
- Joints between brick and frames
- Copings & trims
Do you need external mastic in Strontian?
If plants are growing out of a joint, the sealant has usually failed or was never there. Dirt and roots then trap moisture in the joint.
Common reasons people contact us include:
- Gaps where render, brick and frames meet
- Sealant that has lost its bond to the brick or render
- Rigid filler in a joint that should flex
- Brick movement joints where the sealant has split
If you live in an older home near Strontian Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Questions to ask before booking
- Is the old sealant removed completely?
- How the surfaces are prepared before sealing
- Which sealant they’ll use, and why
- The length of the guarantee
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
In hotels, rooms out of use cost money, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
How the visit works
The work is kept neat and contained to the joints we are treating, so you can get on with your day. Expect the work to take anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. Around Strontian, distance and access matter more than parking. Tell us how to find the property and how to reach the work.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Let us know about parking restrictions
- Mention any tricky access
- Tell us about any previous sealing or DIY attempts
Ask for a quote
To get a quote, email us at info@mrmastic.co.uk with the location and a short description of the problem. We will give you a clear price before any work starts.