Na h-Eileanan Siar · Scotland
Sand mastic for sash & case windows in Grimsay, Na h-Eileanan Siar
Problem with your window and door surrounds in Grimsay? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Weathered mastic on the most exposed windows
- Tired mastic found when preparing windows for paint
- Crumbling sand mastic round a window
About our sand mastic in Grimsay
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It suits period and listed homes where a modern sealant bead would stand out. Typical jobs include mastic dropping out of the joint and cement or filler used on old window joints that has cracked, across period & listed homes, timber door frames and brick reveals.
Many older Scottish homes still have timber windows set into stone walls. 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.
- Where
- Grimsay (HS7)
- Wider area
- Na h-Eileanan Siar
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Common questions in Grimsay
Is sand mastic in a coastal place like Grimsay any different?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do you cover Grimsay for sand mastic?
Yes, Grimsay is within the area we cover. We work across all of Scotland. You can send an email to info@mrmastic.co.uk and tell us what needs doing.
How much does sand mastic cost in Grimsay?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You will get a clear quote before work begins.
Where is Mr Mastic based?
Our base is Crawley. We work across South East England, London and Scotland.
Can sand mastic be painted?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we’ll talk you through it.
Can new sealant go over the old?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we’ll explain our choice.
When to call us in Grimsay
Sand mastic slowly weathers. It hardens, cracks and starts to come away from the frame or the masonry.
If you can see any of these, it’s time to have the joints looked at:
- Gaps where the frame meets the masonry
- Old cement repairs round a window that have failed
- Tired mastic found when preparing windows for paint
- Mastic worn away on windows facing the weather
For jobs in and around Grimsay, choosing the right material for each joint is as important as a tidy finish.
What to look for in a quote
- Whether they’re fully insured
- What guarantee comes with the work
- What preparation is included
- Is VAT in the price?
What affects the quote in Grimsay
Your quote is based on your job. We look at:
- The type of sealant required
- The number of rooms or windows
- How easy the joints are to reach
- The number and length of the joints
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
Asking for a quote
You do not need to know the technical terms. Just tell us:
- What’s wrong with the joints now
- Roughly how big the job is
- Whether it has been sealed before
- A few pictures by email, if you can
There’s no standard price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To arrange one, email us at info@mrmastic.co.uk.
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Sand mastic in Grimsay: local notes
Grimsay 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 the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and sound outside sealant is part of that.
Around Grimsay, as everywhere, sand mastic is only as good as the preparation behind it.
Grimsay (Gaelic: Griomasaigh) is in Na h-Eileanan Siar. From the centre of Grimsay to the outskirts, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Across Na h-Eileanan Siar, we cover 87 places, Grimsay among them.
Jobs for sand mastic in HS7 works the same way as everywhere else we cover. You’ll find Grimsay on the B891, so it’s easy for us to get to with everything needed for sand mastic. Close by, we work in Creag Ghoraidh (2 miles west), Geirinis (5 miles south-west), Balivanich (5 miles north-west), Baile a' Mhanaich (6 miles north-west) and Locheport (10 miles north). Remote and island addresses need a little more planning, so tell us where you are when you ask for a quote.
What’s near Grimsay
Nearby you’ll also find Museum nan Eilean Lionacleit (3.1 miles west) and Borve Castle (3.7 miles north-west). The countryside around Grimsay includes Loch Langavat and Stiaraval.
How it works
You do not need to clear the whole room or building before we come, only the area right around the joints. Everything nearby is protected, and the work takes a few hours for a single window, longer for several for a typical job. Around Grimsay, distance and access matter more than parking. Tell us how to find the property and how to reach the work.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- On commercial sites, let us know about site rules
- Let us know about parking restrictions
- Clear the area around the work
Getting a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
Read more
Looking after it afterwards
After the cure time, these simple habits help:
- Avoid heavy scraping on the mastic joint
- Leave the new mastic unpainted
- Inspect the joints round the windows every year or so
- Plan mastic work ahead of painting
Don’t run silicone over the new mastic. If you see a crack, ask us to take a look rather than patching it.
Sound mastic protects the frame. Once it fails, water can sit against the timber, which can lead to rot.
Can I do it myself?
If you are 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.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Places near Grimsay
More services for Grimsay
Why it’s worth doing now in Grimsay
Not every filler suits an old window surround. Sand mastic is the like-for-like choice and that can be important for listed homes. When the nearest tradesperson is a drive away, it’s tempting to leave a small leak, but water through a failed joint keeps working away until it’s fixed.
Doing several joints on one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Why book with us
- More than 20 years in sealant work
- Fully insured
- 12-month guarantee on every job
- We leave the area clean and tidy
Take a look at how sealant jobs are priced and our reviews.