South Lanarkshire · Scotland
Sand Mastic in New Trows
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in New Trows and across South Lanarkshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Failed mastic on an exposed elevation
- Cement or filler used on old window joints that has cracked
- Gaps between timber frames and stone or brick
Sand mastic in New Trows, done properly
Across New Trows, we renew sand mastic around sash and case windows. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. We’re often asked to deal with weathered mastic on the most exposed windows and draughty sash windows at the surround, across sash and case windows, tenement windows and timber door frames.
Mastic can only go onto a dry joint, so outside work in New Trows depends on the weather. Tell us about access to all the windows and doors, upstairs included.
All our work comes with our 12-month guarantee, wherever you are in South Lanarkshire.
- Location
- New Trows (ML11)
- Wider area
- South Lanarkshire
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
The process
The work is kept neat and contained to the joints we are treating. Expect the work to take a few hours for a single window, longer for several, and we tell you how long to leave it before we go. Outdoor work around New Trows depends on the weather, as sealant needs a dry surface, so an outdoor job can move if the forecast changes. Indoor work goes ahead whatever the weather.
- First, we look at the surrounds with you and agree what needs doing.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about earlier repairs to the joints
Get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that is easy.
Advice
Towns and villages near New Trows
Other services in New Trows
When it isn’t the sealant
It helps to know what we can’t do too:
- Planning or listed building consent (your local planning authority decides)
- Crumbling stone or brickwork round the window
- Putty and glazing repairs
If you’re not sure, just email us at info@mrmastic.co.uk and we’ll give you a straight answer.
Joints and surfaces we work on
- Tenement windows
- Stone surrounds
- Period & listed homes
- Sash and case windows
- Timber door frames
- Brick reveals
Do you need sand mastic in New Trows?
Over the years, sand mastic weathers. It hardens, cracks and starts to come away on the stone or timber.
Signs it’s time to call us include:
- Open joints round the window box
- Mastic dropping out of the joint
- Draughts and rain around sash boxes
- Mastic that needs renewing before redecorating
Schools such as Lesmahagow High School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Before you book anyone
- What guarantee comes with the work
- Whether they’re fully insured
- How long to leave it before use
- Whether all the old sealant comes out first
New Trows: your questions answered
Can you do sand mastic in New Trows?
Yes. We work across all of Scotland, and New Trows is part of that. Just drop us a line at info@mrmastic.co.uk with a few details of the job.
What guarantee comes with sand mastic in New Trows?
All our work, in New Trows and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
I rent my home. Can I book you?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
How much does sand mastic cost in New Trows?
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.
Do I need to be at home?
That depends on where the joints are. Inside work needs someone to give us access.
How long will you be here?
That depends on how much there is to do, but most jobs take a few hours for a single window, longer for several. We’ll tell you when we quote.
Which is right for my windows, sand mastic or modern sealant?
It depends on the window. Period windows in stone or brick generally suit sand mastic and newer frames normally get a flexible sealant.
Is it possible to take out silicone and use sand mastic instead?
Yes, we do this often. The old silicone has to come out completely so the mastic can sit properly.
Different surfaces, different methods
Period and listed homes
A traditional finish suits a period property.
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Keeping the joints in good condition
A little care helps the new joints last. We recommend:
- Inspect the joints round the windows every year or so
- Do not paint over the new mastic
- Make sure water runs off the sill
- Renew mastic before redecorating the windows
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look before trying a quick fix.
Sound mastic protects the frame. Failed mastic lets water reach the timber and timber that stays wet can rot.
New Trows homes and the weather
Many older homes in Scotland have sash and case windows, often pointed into the wall with traditional sand mastic. 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.
For an older house near a landmark such as Lesmahagow Old Parish Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
New Trows is about 8 miles south of Carluke, in South Lanarkshire. If you need sand mastic in New Trows, it’s easy to get a quote: please send an email to info@mrmastic.co.uk. We’re based in Crawley and cover South Lanarkshire, New Trows included. Our area takes in 139 places across South Lanarkshire, from the larger towns to small villages. There’s also a page for Glasgow, roughly 22 miles from New Trows.
Here we cover the ML11 postcode area for sand mastic. We also cover Lesmahagow (1 mile north), Brocketsbrae (1 mile north-east), Devonburn (1 mile east), Dillarburn (2 miles north-east) and Auchenheath (3 miles north). We also work in nearby towns such as East Kilbride (15 miles north-west), Hamilton (12 miles north-west), Blantyre (14 miles north-west), Larkhall (8 miles north), Carluke (8 miles north) and Lanark (6 miles north-east).
Landmarks near New Trows
Well-known places in the area include Douglas Castle (4.7 miles south-east) and Birkwood Castle (0.5 miles north). For a walk, there’s Black Hill.
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.