Highland · Scotland
Sand mastic for sash & case windows in Laggan, Highland
Sand mastic across Laggan and nearby, with old sealant always removed completely and a 12-month guarantee.
- Open joints round the window box
- Cement or filler used on old window joints that has cracked
- Draughty sash windows at the surround
About our sand mastic in Laggan
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. We work on brick reveals, tenement windows and period & listed homes, and people most often call us about modern sealant on a period surround and draughts and rain around sash boxes.
Mastic can only go onto a dry joint, so outside work in Laggan depends on the weather. Let us know about access to every frame, including any upstairs.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Laggan (PH20)
- Region
- Highland
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Clear gutters so water does not pour onto the windows
- Ask us before painting near the mastic
- Check with your local planning authority if your home is listed
- Plan mastic work ahead of painting
Leave the new mastic alone while it firms up. It forms a skin fairly soon, but takes longer to harden fully.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
Why it’s worth doing now in Laggan
New sash windows are a major, costly change, and in listed buildings it may need consent. Where the frames are in good order, new mastic seals the surround. In an older home around Laggan, damp from a failed joint can get into timber and plaster.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why us?
- Every job guaranteed for a year
- Anti-fungal sanitary silicone in wet areas
- 4.9 on Google from 180+ five-star reviews
- Tidy, careful work
Read how sealant jobs are priced or our reviews.
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
A careful DIYer can reseal a simple joint, 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.
When something else is needed
To be straight with you, there are a few things sealant will not fix:
- Damaged stone surrounds
- Whether work needs listed building consent
- Sashes that need overhauling
If in doubt, email us at info@mrmastic.co.uk and we’ll say what we think.
Where we work in Laggan
- Sash and case windows
- Brick reveals
- Stone surrounds
- Timber door frames
- Tenement windows
- Period & listed homes
Common problems we fix in Laggan
Paint, silicone or cement used over old mastic causes problems. They don’t move with the timber, and they normally need raking out.
Most people get in touch when they notice one of these:
- Mastic round period door frames that has failed
- Crumbling sand mastic round a window
- Open joints round the window box
- Window mastic to renew ahead of painting
Around Laggan, as everywhere, sand mastic is only as good as the preparation behind it.
Before you book anyone
- Which sealant they’ll use, and why
- What happens if the job turns out different
- How the joint is cleaned and prepared
- How long the guarantee is
Laggan questions
Will you come out to Laggan?
Yes, we do. We work across all of Scotland, from towns to the smallest places. Longer journeys are simply planned in advance.
Is sand mastic in Laggan guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Can I do it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
What exactly is sand mastic?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and finished to sit neatly against the masonry.
What sealant do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we are using.
Are you fully insured?
Yes. We are fully insured, with over 20 years’ experience in sealant work.
Where do you work from?
Mr Mastic is based in Crawley. We cover Laggan and the rest of Highland, along with the rest of our area.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
The process
A visit follows a simple pattern: we look at the joints together, protect the area around them, do the work and tidy away. Most jobs take a few hours per window, depending on the condition of the joints. Outdoor work around Laggan depends on the weather, as sealant needs a dry surface, so external jobs may need to move if the day turns wet. Work indoors isn’t affected.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- On commercial sites, let us know about site rules
- Let us know about stairs, lifts or work at height
Get a quote
We quote each job on its own, so start by telling us what you need. Simply email us at info@mrmastic.co.uk and describe the job.
Advice
Windows and doors in Laggan
Many older homes in Scotland have sash and case windows, often pointed into the wall with traditional sand mastic. The west of Scotland is wetter than the east, which means the mastic around older windows and doors has to cope with a lot of rain.
In the older streets around Laggan Parish Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Laggan is about 31 miles south of Inverness, in Highland. Anywhere in PH20, we cover sand mastic for homes and businesses. We cover 253 towns and villages across Highland, large and small. Our Dundee page covers work nearby, about 62 miles away.
Our applicators cover all of PH20 for sand mastic. We also cover the places around Laggan: Gergask (1 mile north-west), Etteridge (4 miles east), Dalwhinnie (6 miles south), Newtonmore (7 miles north-east) and Kingussie (10 miles north-east). For island and remote addresses, the job takes a little more planning.
Local landmarks in Laggan
Other landmarks nearby include Cluny Castle (1.8 miles east). Green spaces nearby include Creag Bhuidhe and Loch Caoldair.
Places near Laggan
More services for Laggan
Surface by surface
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.