West Dunbartonshire · Scotland
Sand mastic for sash & case windows in Alexandria, West Dunbartonshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Alexandria, with a one-year guarantee on every job. Ask us for a quote.
- Mastic dropping out of the joint
- Gaps between timber frames and stone or brick
- Wind and rain getting in round a sash window
Sand mastic in Alexandria
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It’s a good fit for period properties, where modern sealant can look out of place. We work on tenement windows, stone surrounds and brick reveals, and common reasons people get in touch are old cement repairs round a window that have failed and mastic dropping out of the joint.
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.
We stand behind the work with a one-year guarantee, so you are covered after we’ve gone.
- Location
- Alexandria (G83)
- Region
- West Dunbartonshire
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
The process
We keep the work tidy and contained to the joints we’re treating. The job normally takes a few hours per window, depending on the condition of the joints. Somewhere like Alexandria may be a longer drive, and the journey is planned ahead. Tell us about tracks, gates, a ferry crossing or anything unusual about getting there.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Keep pets and children clear of the area while we work
- Clear items away from the joints we are working on
Getting a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. Photos by email help us understand the job, and we will take it from there.
Related advice
More services for Alexandria
Keeping the joints in good condition
After the cure time, these simple habits help:
- Take care around the mastic when scraping paint
- Leave the new mastic unpainted
- Have rotten timber repaired before new mastic goes in
- Clear gutters so water doesn’t pour onto the windows
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
What we’re called out for in Alexandria
Previous repairs in cement or silicone often trap water or crack away. They do not suit the joint, and they usually need raking out.
These are the problems we’re asked about most:
- Mastic that needs renewing before redecorating
- Mastic dropping out of the joint
- Mastic worn away on windows facing the weather
- Silicone on a period window that looks wrong
If you look after a building such as Vale of Leven Academy, larger buildings have plenty of frames, and the mastic around each one ages.
Before you book anyone
- Are they insured?
- When the joint can take water or movement
- Is the old sealant removed completely?
- How the surfaces are prepared before sealing
For landlords and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Sand mastic in Alexandria: local notes
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. 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.
For an older house near a landmark such as St Andrew's Parish Church, the joint between an old wall and a newer frame is normally the first place rain gets in. For landlords with property near Alexandria station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Alexandria is about 3 miles north of Dumbarton, in West Dunbartonshire. Every kind of property in Alexandria is covered for sand mastic. The work is guaranteed for a year. Our area takes in 31 places across West Dunbartonshire, large and small. You can also see our page for Glasgow, roughly 15 miles from Alexandria.
We work across G83 for sand mastic. Local streets include North Main Street, Main Street and Lindsay Gardens. You will find Alexandria on the A82 and A811, so it’s easy for us to get to with everything needed for sand mastic. If you’re just outside Alexandria, we cover Dalmonach (1 mile south-east), Bonhill (1 mile south-east), Renton (1 mile south), Castlehill (3 miles south) and Dalreoch (3 miles south). Larger places within reach include Clydebank (8 miles south-east), Linnvale (10 miles south-east), Crosslet (4 miles south-east), Kirktonhill (3 miles south), Cardross (3 miles south-west) and Drumry (9 miles south-east). As one of the bigger places in West Dunbartonshire, Alexandria has homes, rented property and businesses of every kind.
Local landmarks in Alexandria
The nearest railway station is Alexandria station, roughly 0.5 miles south-east of the centre. Well-known places in the area include Vale of Leven Hospital (less than half a mile west) and Tullichewan Castle (0.6 miles north-west). Green spaces nearby include Loch Bowie and Dumbuck Hill.
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Why deal with it now?
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. 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.
What it costs depends on the amount of work, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts.
What you get with us
- Any old sealant cut out fully, not covered over
- 180+ five-star Google reviews
- We are fully insured
- One-year guarantee on every job
Take a look at how sealant jobs are priced or our reviews.
Questions from Alexandria
Do you cover smaller places like Alexandria?
Yes, Alexandria is covered. We work across all of Scotland, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Alexandria station?
Yes, rental work is part of what we do. You can send an email to info@mrmastic.co.uk with the address and a few details, and we will give you a fixed price before work begins.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures.
Can sand mastic be painted?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we will advise.
Where do you work from?
We work from Crawley. Our applicators cover Alexandria, along with the rest of our area.
Are you insured?
Yes. We’re fully insured, and we have been doing sealant work for more than 20 years.
What does sand mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises. Working times can be discussed when we quote.
What the job involves on each surface
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair so it’s worth checking responsibilities.