South Lanarkshire · Scotland
Sand Mastic in Crawfordjohn
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Crawfordjohn, with a one-year guarantee on every job. Call for a quick quote.
- Window mastic to renew ahead of painting
- Mastic dropping out of the joint
- Modern sealant on a period surround
Sand mastic for homes and businesses in Crawfordjohn
A silicone bead around a sash window can look out of place and isn’t always the right material. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. Typical jobs include open joints round the window box and tired mastic found when preparing windows for paint, on period & listed homes, brick reveals and tenement windows.
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.
We stand behind the work with a one-year guarantee, so you’re covered after we’ve gone.
- Where
- Crawfordjohn (ML12)
- Wider area
- South Lanarkshire
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Honest limits
We will not take on work that won’t last, so these are the limits:
- Whether work needs listed building consent
- Broken panes
- Sashes that need overhauling
Not sure which it is? You can send an email to info@mrmastic.co.uk and we’ll tell you honestly.
Where we work in Crawfordjohn
- Stone surrounds
- Period & listed homes
- Brick reveals
- Sash and case windows
- Timber door frames
- Tenement windows
What the job involves on each surface
Sash and case windows
The mastic round a sash window is on show so we finish it carefully.
Timber door frames
Period doors in stone or brick openings are often pointed with sand mastic. We renew it the same way as on windows.
Do you need sand mastic in Crawfordjohn?
Previous repairs in cement or silicone often trap water or crack away. They do not suit the joint and we normally remove them.
If you can see any of these, it’s time to have the joints looked at:
- Gaps between timber frames and stone or brick
- Mastic worn away on windows facing the weather
- Patchy fillers round a sash window
- Draughty sash windows at the surround
For an older house near a landmark such as Crawfordjohn Parish Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before booking
- What product goes in the joint
- The length of the guarantee
- Which colour the sealant will be
- What the quote includes, VAT included or not
Crawfordjohn: your questions answered
Is Crawfordjohn in your area for sand mastic?
Yes, Crawfordjohn is within the area we cover. We work across all of Scotland. Just send an email to info@mrmastic.co.uk with a few details of the job.
Is sand mastic in Crawfordjohn guaranteed?
Every job comes with our one-year guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Is it messy?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Should I use sand mastic or silicone?
For period timber windows in stone or brick, sand mastic is often the better fit. On modern frames, we’d normally use a flexible sealant, and we’ll explain why.
Do you work for letting agents?
Yes. We work in homes, commercial premises and hotels.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Landlords, agents and businesses in Crawfordjohn
We work for letting agents and landlords as well as householders. Sealant work between tenants keeps a property looking cared for.
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Other services in Crawfordjohn
What happens on the day
At the end, we look at the finished work together. The work normally takes a few hours for a single window, longer for several, depending on the size of the job. Somewhere like Crawfordjohn 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 check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
How to prepare
- Mention any parking rules near the property
- Clear the area around the work
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work before giving you a price.
Advice
Windows and doors in Crawfordjohn
Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that. Many older homes in Scotland have sash and case windows, often pointed into the wall with traditional sand mastic.
Around Crawfordjohn, as everywhere, sand mastic is only as good as the preparation behind it.
Crawfordjohn is about 16 miles south of Carluke, in South Lanarkshire. Every kind of property in Crawfordjohn is covered for sand mastic, old or new, large or small. Every job comes with our one-year guarantee. Across South Lanarkshire, we cover 139 places, Crawfordjohn among them. Our Glasgow page covers work nearby.
We cover every part of the ML12 postcode area for sand mastic. We cover properties on Main Street, The Loaning and Cross Road and the roads around them. Other places close to Crawfordjohn include Abington (3 miles east), Douglas (5 miles north-west), Roberton (5 miles north-east), Crawford (5 miles east) and Glespin (5 miles north-west). We also work in nearby towns such as Lanark (12 miles north), Lesmahagow (11 miles north-west), Biggar (13 miles north-east), Kirkmuirhill (13 miles north-west), Blackwood (14 miles north-west) and Coalburn (8 miles north-west).
What’s near Crawfordjohn
Well-known places in the area include Crawfordjohn Heritage Venture (less than half a mile south) and Lady Home Hospital (5 miles north-west).
How we quote for sand mastic
Every job gets its own quote. These are the things that affect it:
- The size of the job
- How many areas need sealing
- How easy the joints are to reach
- The type of sealant required
The cost depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before we start, so you know where you stand.
What to tell us for a quote
When you call or email, it’s useful to know:
- Roughly how big the job is
- How we’d reach the joints
- The type of property
- Any previous sealing or DIY work
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, send an email to info@mrmastic.co.uk.