Scottish Borders · Scotland
Darnick Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Darnick and across the Scottish Borders. Fully insured, ARBOMaster approved and guaranteed for a year.
- Window mastic to renew ahead of painting
- Draughty sash windows at the surround
- Cement or filler used on old window joints that has cracked
Your questions about sand mastic in Darnick
Is Darnick in your area for sand mastic?
Yes. We work across all of Scotland, and Darnick is part of that. Just email us at info@mrmastic.co.uk with a few details of the job, and we’ll give you a clear quote.
I let a flat near Tweedbank station. Can you help?
Yes, rental work is part of what we do. Just send an email to info@mrmastic.co.uk and tell us about the property, and we’ll give you a clear price.
Can I paint the new mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
What’s sand mastic made of?
It’s sand mixed with a linseed-oil-based binder, used between timber frames and stone or brick.
Where do you work from?
We work from Crawley. We cover Darnick and the rest of the Scottish Borders, along with the rest of our area.
How do I get a quote for sand mastic in Darnick?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
Can I do it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
How we handle sand mastic in Darnick
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant, and we will talk through which suits your home. We work on stone surrounds, sash and case windows and period & listed homes, and people most often call us about modern sealant on a period surround and mastic round period door frames that has failed.
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.
A one-year guarantee comes as standard, so you’re not left on your own once the job is done.
- Location
- Darnick (TD6)
- Wider area
- Scottish Borders
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What affects the cost of sand mastic
For a quick quote, just ask. What matters most is:
- Any working-time requirements on site
- The product the joint needs
- How easy the joints are to reach
- How many rooms, windows or areas are involved
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Asking for a quote
To make quoting easier, let us know:
- Whether it’s a home or a business
- How we’d reach the joints
- How many joints, rooms or windows are involved
- The problem you’ve noticed
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Why it’s worth doing now in Darnick
New sash windows are a major, costly change, and in listed buildings it may need consent. Where the frames are in good order, new mastic seals the surround. In a place like Darnick, small leaks are easy to put off, but water through a failed joint keeps working away until it’s fixed.
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and agree the price before starting.
What you get with us
- Trusted Arbo and Everbuild sealants
- Every job guaranteed for a year
- Fully insured
- An ARBOMaster approved applicator
Frames and glazing around Darnick
Many older homes in Scotland have sash and case windows, often pointed into the wall with traditional sand mastic. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that.
Homes close to Holy Trinity Episcopal Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. If you let a flat or house near Tweedbank station, any sash windows need sound mastic to keep draughts and rain out.
Darnick is about 3 miles east of Galashiels, in the Scottish Borders. Our applicators cover sand mastic for householders, landlords and businesses in Darnick and nearby. Our the Scottish Borders coverage runs to 89 places, Darnick among them. There’s also a page for Edinburgh, roughly 30 miles from Darnick.
Work in TD6 is quoted and booked the same way as anywhere else. Streets in the area include Tower Road, Fisher's Lane and Aldie Crescent, and we cover them all. Nearby, we also carry out sand mastic in Melrose (1 mile east), Gattonside (1 mile north-east), Tweedbank (1 mile west), Langlee (2 miles north-west) and Newstead (2 miles east). Further out, we also cover Galashiels (3 miles west), Hawick (12 miles south), Kelso (12 miles east), Selkirk (5 miles south-west), Jedburgh (11 miles south-east) and Wilton (12 miles south).
Near you in Darnick
Darnick’s nearest station is Tweedbank station, roughly 0.7 miles north-west of the centre. Nearby you’ll also find Castle Holydean (2.6 miles south) and Borders General Hospital (less than half a mile south). Green spaces nearby include Bemersyde Moss and Eildon Mid Hill.
Different surfaces, different methods
Stone surrounds
The stone is treated with care when the old mastic comes out.
Brick reveals
Loose mastic comes out and deep gaps are packed before the new mastic goes in.
Places near Darnick
Other services in Darnick
Work for landlords, hotels and businesses
We also work for property managers and facilities teams in Darnick and across the Scottish Borders. Several sites can go on one quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.
Honest limits
We’d rather tell you now than do work that will not last, so these are the limits:
- Timber that has rotted
- Crumbling stone or brickwork round the window
- Putty and glazing repairs
Not sure which it is? You can email us at info@mrmastic.co.uk and we’ll tell you honestly.
Where we work in Darnick
- Tenement windows
- Brick reveals
- Timber door frames
- Period & listed homes
- Sash and case windows
- Stone surrounds
How the visit works
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes anything from a few hours to a full day, depending on how many windows, and the area is left clean. Outside jobs in Darnick need a dry day, because sealant will not bond to a wet joint, so external jobs may need to move if the day turns wet. Indoor work goes ahead whatever the weather.
- First, we look at the surrounds with you and agree what needs doing.
- We rake out the old mastic and clean the joint.
- 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
- Let us know about parking restrictions
- Let us know about stairs, lifts or work at height
- Let us know if you’ve seen damp or leaks
Ask for a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, email us at info@mrmastic.co.uk.