Highland · Scotland
Balnacra External Mastic
External mastic across Balnacra and nearby, with old sealant always removed completely and a 12-month guarantee.
- Leaking joints around cladding and façade panels
- Joints with sealant missing in places
- Gaps where render, brick and frames meet
Why deal with it now?
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. In a place like Balnacra, small leaks are easy to put off, but water through a failed joint keeps working away until it’s fixed.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
What you get with us
- Domestic, commercial and hotel work
- Every job guaranteed for a year
- A sealant colour to suit the surroundings
- Neat joints and a tidy finish
See our cost guide or what customers say.
About our external mastic in Balnacra
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We strip the joint back and start again. Common call-outs are for joints with sealant missing in places and cracked joints where brick meets render or frames, on brickwork movement joints, concrete & block and copings & trims.
Across smaller places in Scotland, stone and harled cottages, farm buildings and newer houses often stand exposed to wind and rain. Outside joints on exposed walls work hard, so they need a sealant that moves with the building.
The work is covered for a year after we finish. If there’s a problem with it, please send an email to info@mrmastic.co.uk.
- Location
- Balnacra (IV54)
- Wider area
- Highland
- Guarantee
- One year on every job
- Quotes
- A clear price before work begins
- info@mrmastic.co.uk
- Updated
- 26 October 2026
When something else is needed
Sealant is not the answer to every problem, and we’d rather say so up front. Sealant will not put right:
- Render that is blown, hollow or coming away
- Damp that isn’t coming from the joint
- Walls that need new movement joints cut into them
If you’re not sure, just drop us a line at info@mrmastic.co.uk and we’ll give you a straight answer.
What we seal
- Copings & trims
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
What affects the cost of external mastic
There’s no set price list. The quote depends on:
- How many areas need sealing
- Mould in or behind the old joints
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- The type of property
- Where the job is, and your postcode
- Pictures of the joints, sent by email
- Whether it has been sealed before
If you are in Balnacra and need external mastic, drop us a line at info@mrmastic.co.uk. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Balnacra questions
Can you help a landlord with a rental near Achnashellach station?
Yes. We work for letting agents and landlords as well as homeowners. Just email us at info@mrmastic.co.uk with the address and what needs doing, and we will send you a clear quote.
Is Balnacra in your area for external mastic?
Yes, Balnacra is within the area we cover. Our work covers the whole of Scotland. You can email us at info@mrmastic.co.uk and tell us what needs doing.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access, and for outside work we’ll agree access with you when we book.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status and we are fully insured too.
Which products do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Where do you work from?
We are a Crawley-based firm. We work across South East England, London and Scotland.
Do you guarantee your work?
Yes, always. Each job is guaranteed for twelve months.
What does external mastic cost?
Every job is different, so each one gets its own quote. For a quick quote, email us at info@mrmastic.co.uk with a short description of the job.
Surface by surface
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
The process
We keep the work tidy and contained to the joints we’re treating. Expect the work to take anything from a few hours to several days, depending on the building. For a place like Balnacra, longer drives are planned in advance. Tell us about tracks, gates, a ferry crossing or anything unusual about getting there.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- 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.
- 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.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Mention if the joints have been sealed before
- On commercial sites, let us know about site rules
Getting a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, drop us a line at info@mrmastic.co.uk.
Related advice
Also near Balnacra
Also in Balnacra
Should I try it myself first?
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.
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.
Walls and rooflines in Balnacra
Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that. Harled (roughcast) walls are common in Scotland, and where harling meets frames, pipes and other materials, the joint needs a flexible sealant that grips a rough surface.
If you let a flat or house near Achnashellach station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Balnacra is in Highland. Across the IV54 area, we can carry out external mastic at your property. Balnacra is one of 253 towns and villages in Highland where we work for external mastic.
All of IV54 is within our area for external mastic, from the main roads to the quietest streets. Balnacra is on the A890, which makes it straightforward to reach. We also cover Srath Carran (3 miles south-west), Achintee (4 miles south-west), Lochcarron (6 miles south-west), Torridon (8 miles north-west) and Strome Ferry (10 miles south-west). Remote and island addresses need a little more planning, so please mention your location when you drop us a line at info@mrmastic.co.uk.
Local landmarks in Balnacra
The nearest railway station is Achnashellach station, about 2.1 miles north-east. Not far away are Loch Dùghaill.
Signs you need external mastic in Balnacra
If plants are growing out of a joint, the sealant has generally failed or was never there. Roots and dirt hold water against the wall and speed up the damage.
The problems people normally mention when they call include:
- Brick movement joints where the sealant has split
- Panel joints letting water in
- Cracked joints where brick meets render or frames
- Movement joints filled with mortar instead of sealant
In and around Balnacra, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
Questions to ask before booking
- Who turns up on the day
- Whether VAT is included
- How the surfaces are prepared before sealing
- Whether all the old sealant comes out first