Orkney Islands · Scotland
Sand mastic for sash & case windows in Clestrain, Orkney Islands
Professional sand mastic in and around Clestrain, with every bit of old sealant taken out first.
- Old sand mastic that has cracked, crumbled or fallen out
- Gaps between timber frames and stone or brick
- A silicone bead on a sash window that spoils the look
About our sand mastic in Clestrain
For a listed home or one in a conservation area, ask your local planning authority whether consent is needed for work to windows. Sand mastic is often favoured as a like-for-like material. We work on brick reveals, stone surrounds and timber door frames, and people most often call us about gaps between timber frames and stone or brick and modern sealant on a period surround.
Many older Scottish homes still have timber windows set into stone walls. Those suit a traditional sand mastic or a neutral-cure sealant, not an acetoxy silicone that can attack some stone.
We stand behind the work with a one-year guarantee.
- Place
- Clestrain (KW17)
- Wider area
- Orkney Islands
- Cover
- One year on every job
- Price
- A clear price before we start
- info@mrmastic.co.uk
- Updated
- 26 October 2026
When something else is needed
A few problems are outside what sealant work can do:
- Sashes that need overhauling
- Decayed frames that need repair
- Broken panes
Not sure which it is? You can drop us a line at info@mrmastic.co.uk and we’ll tell you honestly.
Where we work in Clestrain
- Tenement windows
- Stone surrounds
- Timber door frames
- Sash and case windows
- Period & listed homes
- Brick reveals
What sand mastic looks like in Clestrain
Clestrain is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Sash and case windows are common in older Scottish homes, and the joint between the box frame and the stone or render is traditionally pointed with sand mastic.
For jobs in and around Clestrain, choosing the right material for each joint is as important as a tidy finish.
Clestrain is about 9 miles west of Kirkwall, in the Orkney Islands. Whether you’re in the middle of Clestrain or further out, sand mastic is available for homes and businesses alike. Our area takes in 51 places across the Orkney Islands, from the larger towns to small villages.
All of KW17 is covered for sand mastic. We also cover the places around Clestrain: Midland (2 miles south-east), Orphir (2 miles east), Clouston (3 miles north), Kirbister (3 miles east) and Stenness (3 miles north). Remote and island addresses need a little more planning, so please mention your location when you email us at info@mrmastic.co.uk.
Local landmarks in Clestrain
The countryside around Clestrain includes Loch of Kirbister and Brodgar RSPB Reserve.
Common questions in Clestrain
Do you cover Clestrain for sand mastic?
Yes, Clestrain is within the area we cover. Our work covers the whole of Scotland. You can send an email to info@mrmastic.co.uk and tell us what needs doing.
Will you come out to Clestrain?
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.
Is it possible to paint over sand mastic?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we’ll advise.
How long does sand mastic take to harden?
It forms a skin fairly soon, then hardens over a longer period. The weather and joint depth both affect it.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
How much does sand mastic cost in Clestrain?
It depends on the job, so we quote each one individually. For a quick quote, send an email to info@mrmastic.co.uk with a short description of the job.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Can I choose the sealant colour?
Generally, yes. White, clear and grey are common, and other colours are available, and we agree the colour with you before work begins.
What happens if it’s left?
Replacing sash windows is a big decision for a period home, and in listed buildings it may need consent. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Out of town in Scotland, exposed walls take a lot of weather, and once water gets behind a failed joint, damp in stone or harled walls is slow to dry out.
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote.
What you get with us
- Over 20 years’ experience
- One-year guarantee on every job
- Homes, businesses and hotels
- Old sealant always removed completely
Take a look at what affects the cost or customer reviews.
How we quote for sand mastic
Call for a quick quote. What matters most is:
- The old material and how stubborn it is
- How many rooms, windows or areas are involved
- The product the joint needs
- How easy the joints are to reach
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs. Call for a quick quote and we will go through it with you.
Helping us quote
To help us quote quickly, please include:
- Whether it has been sealed before
- The address or postcode of the job
- What’s wrong with the joints now
- A few photos by email, if you can
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we will talk you through the work.
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Leave the new mastic unpainted
- Avoid patching sand mastic with silicone
- Take care around the mastic when scraping paint
- Keep sills and gutters clear so water drains away
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry so early renewal protects both.
Signs you need sand mastic in Clestrain
Some old mastic was never deep enough. A thin layer does not hold well, which is why we pack deep voids first and get the depth right.
The problems people normally mention when they call are:
- Cement or filler used on old window joints that has cracked
- Silicone on a period window that looks wrong
- Window mastic to renew ahead of painting
- Weathered mastic on the most exposed windows
Around Clestrain, as everywhere, sand mastic is only as good as the preparation behind it.
What your quote should include
- Are they insured?
- What guarantee comes with the work
- What the cure time is
- How the colour is chosen
What we do, step by step
You do not need to clear the whole room or building before we come, just the space around the work. We protect the rest, and the work takes anything from a few hours to a full day, depending on how many windows for a typical job. Outdoor work around Clestrain depends on the weather, as sealant needs a dry surface, so an outdoor job can move if the forecast changes. Work indoors isn’t affected.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Mention if the joints have been sealed before
- Move anything stored near the joints
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
There’s no standard 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.
Read more
Other services in Clestrain
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.