Highland · Scotland
Altnaharra Sand Mastic
Sand mastic across Altnaharra and nearby, with every bit of old sealant taken out first.
- Cement or filler used on old window joints that has cracked
- Draughts and rain around sash boxes
- Tired mastic found when preparing windows for paint
Sand mastic for homes and businesses in Altnaharra
We renew sand mastic around sash windows and doors set in stone or brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. We work on tenement windows, stone surrounds and brick reveals, and common reasons people get in touch are open joints round the window box and gaps round a timber door in stone or brick.
Older stone-built homes in Scotland often have sash and case or timber windows set in stone. The sealant has to suit the stone, which rules out acetoxy silicones that can mark or attack it.
There’s a 12-month guarantee on every job, large or small.
- Place
- Altnaharra (IV27)
- Region
- Highland
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Aftercare tips
Looking after new joints is easy:
- Make sure water runs off the sill
- Ask the planning authority about consent for listed or conservation-area homes
- Check the mastic when you check the paintwork
- Don’t run silicone over sand mastic
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall, so renewing it early is worth it.
Should I try it myself first?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
A DIY attempt does not rule out a professional job. We cut it out and start again.
Why deal with it now?
Before painting the windows, it pays to renew the mastic. Painting over failed mastic does not seal it and traditional guidance is to leave the new mastic unpainted. In an older home around Altnaharra, damp from a failed joint can get into timber and plaster.
Doing several joints on one visit is usually more efficient than separate visits, so it’s worth mentioning everything you’d like done. We will give you a clear price for the lot.
Why Altnaharra clients choose us
- Anti-fungal silicone where joints get wet
- Approved under the ARBOMaster scheme
- Any old sealant cut out fully, not covered over
- Full insurance on every job
Take a look at our cost guide and what customers say.
Quotes for sand mastic in Altnaharra
Your quote is based on your job. We take into account:
- Mould in or behind the old joints
- The size of the job
- The type of sealant required
- The number of rooms or windows
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Helping us quote
To make quoting easier, let us know:
- Pictures of the joints, sent by email
- The rough size of the job
- How we’d reach the joints
- Where the job is, and your postcode
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. When it suits you, send an email to info@mrmastic.co.uk.
Nearby places to Altnaharra
What else we do in Altnaharra
What we’re called out for in Altnaharra
Age is the main cause. Even well-laid mastic needs renewing in time and how long it lasts depends on the weather it faces.
Keep an eye out for these signs:
- Mastic round period door frames that has failed
- Old cement repairs round a window that have failed
- Mastic that needs renewing before redecorating
- Modern sealant on a period surround
Around Altnaharra, as everywhere, sand mastic is only as good as the preparation behind it.
What your quote should include
- What happens if they find a problem under the old sealant
- How the colour is chosen
- How much experience the applicator has
- Whether they seal over old material or remove it
Sand mastic in Altnaharra: local notes
Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that. Many older homes in Scotland have sash and case windows, and the joint between the box frame and the stone or render is traditionally pointed with sand mastic.
Whether the job is in Altnaharra itself or nearby, the right material for each joint matters as much as a neat finish.
Altnaharra is about 39 miles south-west of Thurso, in Highland. Every kind of property in Altnaharra can book us for sand mastic, old or new, large or small. Every job comes with our one-year guarantee. We cover 253 towns and villages across Highland, large and small.
Postcode districts we cover here for sand mastic: IV27. Neighbouring places we cover for sand mastic 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.
Near you in Altnaharra
Green spaces nearby include Loch Eileanach and Meall an Fhuarain.
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes a few hours per window, depending on the condition of the joints, including the tidy-up. In smaller Scottish places, parking is usually less of an issue than access and distance. Tell us how to find the property and how to reach the work.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any water getting in
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To get started, email us at info@mrmastic.co.uk.
Advice
FAQs for Altnaharra
Do you cover Altnaharra for sand mastic?
Yes. We work across all of Scotland, and Altnaharra is part of that. Just email us at info@mrmastic.co.uk with a few details of the job.
Is there a guarantee on sand mastic in Altnaharra?
All our work, in Altnaharra and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we have agreed the job, you do not need to watch us work.
Can tenants book the work?
Of course. Ask your landlord first, and we can send them the quote if that helps.
Is it possible to paint over sand mastic?
Traditional guidance is not to paint over sand mastic. If you are redecorating the window, ask us first and we will advise.
Is it possible to take out silicone and use sand mastic instead?
In most cases. The silicone is cut out and the joint cleaned, then point it with sand mastic.
What exactly is sand mastic?
It’s sand mixed with a linseed-oil-based binder for the joint between timber frames and masonry.
Do you work for landlords and businesses?
Yes, regularly. We can quote for several properties at once, and between tenancies is a good time for the work.