Highland · Scotland
Altnaharra External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for Altnaharra, backed by a one-year guarantee. Ask us for a quote.
- Joints pointed up with cement by mistake
- Rain getting behind render or cladding at a joint
- Panel joints letting water in
External mastic in Altnaharra
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two where mortar or filler would crack. If you’re dealing with joints with sealant missing in places and leaking joints around cladding and façade panels, we can help, whatever the surface.
External sealant needs dry surfaces, so outdoor work around Altnaharra is planned around the weather, and longer journeys are planned in advance. Let us know about access to every wall and roofline.
We stand behind the work with a 12-month guarantee, so you are covered after we have gone.
- Place
- Altnaharra (IV27)
- Region
- Highland
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
What happens on the day
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes anything from a few hours to several days, depending on the building. For a place like Altnaharra, longer drives are planned in advance. Mention tracks, gates, ferries or anything else about the route.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- Let us know if you’ve seen damp or leaks
- Mention any sign-in or site rules at work premises
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
We do not publish a price list. Instead, we give you a clear price for your job. To get started, drop us a line at info@mrmastic.co.uk.
Related advice
Places near Altnaharra
What else we do in Altnaharra
Surface by surface
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that’s happened, we rake it out and reseal it properly where it can be done safely.
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. We reseal them with an exterior sealant suited to the material.
What we’re called out for in Altnaharra
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
The most common problems we see are:
- Weeds or debris growing in open joints
- Failed sealant between panels on a façade
- Movement joints filled with mortar instead of sealant
- Gaps where render, brick and frames meet
In and around Altnaharra, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
Before booking anyone
- What preparation is included
- Which colour the sealant will be
- How hidden problems are handled
- How much experience the applicator has
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Should I try it myself first?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Altnaharra: your questions answered
Can you do external mastic in Altnaharra?
Yes, Altnaharra is within the area we cover. Our work covers the whole of Scotland. Just send an email to info@mrmastic.co.uk with a few details of the job, and we will give you a clear quote.
Will you come out to Altnaharra?
Yes. Altnaharra is within the area we cover, which takes in towns, villages and rural addresses. We work across all of Scotland. Let us know about access, parking and anything unusual about getting there when you book.
Do the sealants smell?
Possibly a little. It fades as the sealant cures.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. Indoors, that normally means someone at home.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Altnaharra and the rest of Highland, along with the rest of our area.
Should I point up the gap in my brickwork?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
Are you insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Altnaharra buildings and the weather
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. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and sound outside sealant is part of that.
For jobs in and around Altnaharra, choosing the right material for each joint is as important as a tidy finish.
Altnaharra is about 39 miles south-west of Thurso, in Highland. If you need external mastic in Altnaharra, it’s easy to get a quote: please send an email to info@mrmastic.co.uk. We’re based in Crawley and cover Highland. Across Highland, we cover 253 places, Altnaharra among them.
Our applicators cover all of IV27 for external mastic. Other places close to Altnaharra include Tongue (13 miles north), Melness (17 miles north), An Luirg (18 miles south), Am Blàran Odhar (19 miles north-east) and Innis nan Lìon (21 miles south). Island and remote addresses take a little more planning, so tell us where you are when you ask for a quote.
What’s near Altnaharra
Green spaces nearby include Loch Eileanach and Meall an Fhuarain.
When it isn’t the sealant
A few problems are outside what sealant work can do:
- Cracking across the wall rather than at a joint
- Subsidence or other structural problems
- Render that’s blown, hollow or coming away
If you’re not sure, just email us at info@mrmastic.co.uk and we will give you a straight answer before you book.
What we seal
- Brickwork movement joints
- Copings & trims
- Concrete & block
- Render & cladding joints
- Façade panels
- Joints between brick and frames
Looking after it afterwards
So the new joints stay in good condition:
- Point out the joints to other trades
- Do not let climbing plants root in the sealant
- Leave the joints unpainted unless we’ve said otherwise
- Act on the first splits you see
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.