Highland · Scotland
External & façade joints in Dunnet, Highland
External mastic in Dunnet from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Joints pointed up with cement by mistake
- Water getting into walls through failed joints
- Failed sealant between panels on a façade
External mastic in Dunnet: local notes
Dunnet is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. Plenty of Scottish homes have harled walls, and where harling meets frames, pipes and other materials, the joint needs a flexible sealant that grips a rough surface.
Around Dunnet, as everywhere, external mastic is only as good as the preparation behind it.
Dunnet is about 7 miles east of Thurso, in Highland. Homes, rented property, offices and hotels in Dunnet can book us for external mastic, old or new, large or small. Every job comes with our one-year guarantee. Dunnet is one of 253 towns and villages in Highland we cover.
Every address in KW14 is covered for external mastic. Other places close to Dunnet include Brough (2 miles north), Castletown (3 miles south-west), Scarfskerry (3 miles north-east), Rattar (3 miles north-east) and Murkle (4 miles south-west). Island and remote addresses take a little more planning, so please mention your location when you email us at info@mrmastic.co.uk.
Landmarks near Dunnet
Other landmarks nearby include Westside Croft (0.5 miles north-west) and Castle of Mey (4.5 miles east). Not far away are St John's Loch.
External mastic in Dunnet
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. Common call-outs are for brick movement joints where the sealant has split and old sealant gone brittle and cracked, across façade panels, concrete & block and render & cladding joints.
External sealant needs dry surfaces, so outdoor work around Dunnet is planned around the weather, and longer journeys are planned in advance. Let us know about access to every wall and roofline.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- Dunnet (KW14)
- Region
- Highland
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Places near Dunnet
More services for Dunnet
Can I do it myself?
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 doesn’t work out, we can still put it right.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Dunnet: your questions answered
Can you do external mastic in Dunnet?
Yes. We work across all of Scotland, and Dunnet is part of that. You can send an email to info@mrmastic.co.uk and let us know what needs doing, and we’ll give you a clear quote.
Is Dunnet within the area you cover?
Yes. Dunnet 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.
What colours does the sealant come in?
The sealant colour is picked to suit the wall, so the joint sits quietly in the wall. There’s a wide choice of exterior colours.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can a movement joint be filled with mortar?
No, not where the gap is a movement joint. Pointing it stops it working and can lead to cracking. A flexible sealant is the right fill.
Do you have insurance?
Yes. We are fully insured, with over 20 years’ experience in sealant work.
How often do external joints need resealing?
It depends on the exposure, the movement and the product. Sealant is a maintenance item, so check the joints once a year and renew it when it starts to fail.
Can I add another job to the visit?
Yes. Just list everything you need and we will quote it together.
Landlord and commercial work in Dunnet
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Failed sealant is one of the commonest items on a check-out report. Several properties can go on one quote.
What we’re called out for in Dunnet
If plants are growing out of a joint, the sealant has normally failed or was never there. Dirt and roots then trap moisture in the joint and speed up the damage.
People usually contact us after spotting one of these:
- Panel joints letting water in
- Joints where the bead has come unstuck
- Moss and dirt in joints with no sealant left
- Failed seals between different materials
If you live in an older home near Dunnet Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What to look for in a quote
- Whether you can choose the colour
- What the quote includes, VAT included or not
- Whether the sealant suits the joint
- How much experience the applicator has
Surface by surface
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it. Tell us what the building has when you get in touch.
Render joints
Cracks along render joints let water in behind the coat. A sound joint keeps the render dry behind.
Why deal with it now?
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner so it’s worth doing right. In an older home around Dunnet, damp from a failed joint can get into timber and plaster, which is a far bigger job than the sealant.
Doing several joints on one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. We’ll send you a clear quote for the lot.
Why Dunnet clients choose us
- Experience in homes, commercial sites and hotels
- Tidy, careful work
- A choice of colours where the product allows
- Rated 4.9 stars on Google
Take a look at how sealant jobs are priced and customer reviews.
The process
On the day, we look over the joints with you first. Surfaces next to the work are protected before any work starts. The work generally takes anything from a few hours to several days, depending on the building. Somewhere like Dunnet may be a longer drive, and the journey is planned ahead. 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.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- On commercial sites, let us know about site rules
- Mention any tricky access
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
For a quote, email us at info@mrmastic.co.uk and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
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What we can’t put right
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Walls that need new movement joints cut into them
- Damp that isn’t coming from the joint
- Cracking across the wall rather than at a joint
If you are not sure, just send an email to info@mrmastic.co.uk and we’ll give you a straight answer before you book.
Surfaces we seal
- Joints between brick and frames
- Copings & trims
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
- Façade panels