Shetland Islands · Scotland
Baltasound External Mastic
Specialist external mastic for Baltasound: careful preparation, the right product and tidy work. Call for a quick quote.
- Rain getting behind render or cladding at a joint
- Movement joints filled with mortar instead of sealant
- Failed sealant between panels on a façade
Baltasound questions
Is Baltasound in your area for external mastic?
Yes, Baltasound is within the area we cover. Our work covers the whole of Scotland. You can drop us a line at info@mrmastic.co.uk and let us know what needs doing, and we’ll give you a clear quote.
Will you come out to Baltasound?
Yes, smaller places are covered as well as towns. Our work covers the whole of Scotland, including the islands, where work is planned around ferry crossings. Let us know about access, parking and anything unusual about getting there when you book.
Should I try DIY first?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
What does external mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote and we’ll talk you through it.
Where are you based?
We work from Crawley. We cover Baltasound and the rest of the Shetland Islands, along with the rest of our area.
Do you work at height?
Each building is different. Send us photos and a rough idea of the height and we’ll confirm how they can be reached safely.
Do you work for landlords and businesses?
Yes. We work in homes, commercial premises and hotels, and we’re fully insured.
Can you work on commercial sites?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
External mastic in Baltasound, done properly
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. We work on copings & trims, joints between brick and frames and brickwork movement joints, and the jobs we see most are joints where the bead has come unstuck and joints with sealant missing in places.
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.
Whatever the size of the job, it’s backed by our one-year guarantee in Baltasound and across the Shetland Islands.
- Where
- Baltasound (ZE2)
- Wider area
- Shetland Islands
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
When it is not the sealant
We’ll always be straight with you, so here’s what new sealant will not do:
- Cracking across the wall rather than at a joint
- Damp that is not coming from the joint
- Adding movement joints to masonry that has none
If you’re not sure, just send an email to info@mrmastic.co.uk and we will give you a straight answer.
Surfaces we seal
- Façade panels
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Brickwork movement joints
Can I do it myself?
A DIY attempt does not rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Landlords, agents and businesses in Baltasound
For anyone letting property in or around Baltasound, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and pictures by email help.
Letting agents and landlords in Baltasound can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
Different surfaces, different methods
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. We prime where the sealant needs it before sealing.
How we quote for external mastic
The quote reflects the job in front of us. We take into account:
- The size of the job
- Whether old sealant or filler has to be cut out
- Any working-time requirements on site
- Whether there’s mould to deal with
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Roughly how big the job is
- Photos by email, if that is easy
- If it’s domestic, commercial or a hotel
- Any access issues, like height or stairs
We do not publish a price list, because every job is different. Instead, we give you a clear quote for your job. To arrange one, send an email to info@mrmastic.co.uk.
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours to a few days, depending on the length of joint and the access and we leave things clean and tidy. For a place like Baltasound, longer drives are planned in advance. Mention tracks, gates, ferries or anything else about the route.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any sign-in or site rules at work premises
Getting a quote
If you are in Baltasound and need external mastic, send an email to info@mrmastic.co.uk. Tell us what the problem is and where, and you’ll get a clear quote before we start.
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What else we do in Baltasound
Outside joints around Baltasound
Baltasound is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. On the islands, wind and salt spray are hard on outside sealant.
In the older streets around Kirkhoull, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Managing a site like Baltasound Junior High School? Then its movement joints, gutters and trims need looking after like any other building’s.
Baltasound is in the Shetland Islands. Homes, rented property, offices and hotels in Baltasound can book us for external mastic. The work is guaranteed for a year. 63 places in the Shetland Islands are on our list, from the larger towns to small villages.
We work across ZE2 for external mastic and the streets around it. If you need external mastic at a property on Setters Hill Estate, Curlew Avenue and Cormorant Way or a nearby road, our applicators can take on the job. Other places close to Baltasound include Haroldswick (3 miles north-east), Clivocast (6 miles south), Cullivoe (6 miles south-west), Houbie (11 miles south) and Camb (12 miles south-west). Being one of the Shetland Islands’s larger places, Baltasound has homes, rented property and businesses of every kind. Remote and island addresses need a little more planning, so tell us where you are when you ask for a quote.
Near you in Baltasound
Well-known places in the area include Unst Boat Haven (2.1 miles north-east). For a walk, there’s Loch of Beiton and Muckle Heog.
Aftercare tips
A little care helps the new joints last. We recommend:
- Fix overflowing gutters above sealed joints
- Tell anyone working on the walls about the movement joints
- Leave the joints unpainted unless we’ve said otherwise
- Act on the first splits you see
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.