Scottish Borders · Scotland
Sand mastic for sash & case windows in Preston, Scottish Borders
We cover Preston for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic worn away on windows facing the weather
- Mastic round period door frames that has failed
Sand mastic in Preston, done properly
Sand mastic doesn’t last for ever and gaps open up round the frame. Renewing it closes the gap and tidies the surround. If you are dealing with patchy fillers round a sash window and mastic worn away on windows facing the weather, we can help.
Outdoor sealant needs a dry surface, so window work around Preston is planned around the weather, and longer journeys are planned in advance. Tell us about access to all the windows and doors, upstairs included.
A one-year guarantee comes as standard, so you are covered after we’ve gone.
- Place
- Preston (TD11)
- Wider area
- Scottish Borders
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
What we are called out for in Preston
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.
Look out for any of the following:
- Window mastic to renew ahead of painting
- Modern sealant on a period surround
- Open joints round the window box
- Weathered mastic on the most exposed windows
Around Preston, as everywhere, sand mastic is only as good as the preparation behind it.
What to look for in a quote
- The length of the guarantee
- Is the old sealant removed completely?
- How the joint is cleaned and prepared
- Which sealant they’ll use, and why
Frames and glazing around Preston
Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and failed outside joints work against that. 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.
In the older streets around Preston Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Preston is in the Scottish Borders. We carry out sand mastic for homeowners, landlords and businesses in Preston and the surrounding area. 89 places in the Scottish Borders are on our list, large and small. You can also see our page for Edinburgh, about 35 miles away.
Jobs for sand mastic in TD11 is quoted and booked the same way as anywhere else. Other places close to Preston include Duns (2 miles south), Clockmill (3 miles south-west), Gavinton (3 miles south-west), Chirnside (5 miles east) and Grantshouse (5 miles north).
Local landmarks in Preston
Well-known places in the area include Knoll Hospital (2.5 miles south) and Cockburn Tower (1.7 miles north-west). Open spaces near Preston include Duns Castle nature reserve and Duns Law.
When something else is needed
Sealant is not the answer to every problem, and we will tell you before we start. Sealant won’t put right:
- Crumbling stone or brickwork round the window
- Decisions on consent for listed homes
- Cracked or broken glass
If in doubt, send an email to info@mrmastic.co.uk and we will say what we think.
Joints and surfaces we work on
- Sash and case windows
- Timber door frames
- Period & listed homes
- Tenement windows
- Stone surrounds
- Brick reveals
Nearby places to Preston
Also in Preston
How the job changes by surface
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. Sand mastic seals the joint round it.
Stone surrounds
Stone openings are rarely perfectly straight, so the gap isn’t the same all the way round. Sand mastic is shaped by hand to suit.
How to look after the new joints
After the cure time, these simple habits help:
- Get any rot dealt with first
- Check with your local planning authority if your home is listed
- Plan mastic work ahead of painting
- Do not paint over the new mastic
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
Landlords, agents and businesses in Preston
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
We work for landlords and letting agents as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Preston: your questions answered
Is Preston in your area for sand mastic?
Yes. We work across all of Scotland, and Preston is part of that. Just email us at info@mrmastic.co.uk with a few details of the job, and we will give you a clear price.
What guarantee comes with sand mastic in Preston?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
Is it OK to seal over old sealant?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Can I paint the new mastic?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Can tenants book the work?
Of course. Check with your landlord; we can send the quote to them too.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Can I add another job to the visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
The process
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes anything from a few hours to a full day, depending on how many windows. For a place like Preston, longer drives are planned in advance. Tell us about tracks, gates, a ferry crossing or anything unusual about getting there.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Preparing for the visit
- Keep children and pets away from the work area
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work.