Scottish Borders · Scotland
Sand mastic for sash & case windows in Tweedbank, Scottish Borders
Sand mastic for Tweedbank, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Old sand mastic that has cracked, crumbled or fallen out
- Draughts and rain around sash boxes
- Gaps round a timber door in stone or brick
Sand mastic in Tweedbank
We work across Tweedbank renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. Typical jobs include cement or filler used on old window joints that has cracked and failed mastic on an exposed elevation, across stone surrounds, timber door frames and tenement windows.
Across smaller places in Scotland, homes range from stone and harled cottages to newer houses, many standing in the open. Wind-driven rain finds any gap around a frame or sill, so the mastic there works hard.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Tweedbank (TD1, TD6)
- Region
- Scottish Borders
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
What sand mastic looks like in Tweedbank
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. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that.
If you look after a building such as Galashiels Academy, its window and door frames need their mastic kept sound, just like a home’s.
Tweedbank is about 2 miles south-east of Galashiels, in the Scottish Borders. Tweedbank gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. 89 places in the Scottish Borders are on our list, from the larger towns to small villages. You can also see our page for Edinburgh, roughly 29 miles from Tweedbank.
Here we cover the TD1 and TD6 postcode area for sand mastic. If you need sand mastic at a property on Cotgreen Road, Abbotsferry Road and Tweedbank Avenue or anywhere close by, we can help. Neighbouring places we cover for sand mastic include Langlee (1 mile north-west), Darnick (1 mile east), Boleside (2 miles south-west), Gattonside (2 miles east) and Galashiels (2 miles north-west). Larger places within reach include Hawick (12 miles south), Kelso (13 miles east), Selkirk (5 miles south-west), Jedburgh (12 miles south-east), Wilton (12 miles south) and Innerleithen (12 miles west).
What’s near Tweedbank
There’s a railway station in Tweedbank itself: Tweedbank station. Nearby you will also find Old Gala House (1.8 miles north-west) and Borders General Hospital (1.1 miles south-east). Open spaces near Tweedbank include Eildon Mid Hill.
Tweedbank questions
Can you help a landlord with a rental near Tweedbank station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just send an email to info@mrmastic.co.uk with the address and what needs doing, and we will send you a clear quote.
Do you cover smaller places like Tweedbank?
Yes, smaller places are covered as well as towns. Our work covers the whole of Scotland. Let us know about access, parking and anything unusual about getting there when you book.
Can you replace silicone on a period window with sand mastic?
Yes, we do this often. The old silicone has to come out completely so the mastic beds in well.
Should I use sand mastic or silicone?
We will help you decide. Period homes often look best with sand mastic, and modern sealants suit newer frames.
Can new sealant go over the old?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. We remove it all first.
Do you remove the old sealant?
Yes, every time. New sealant will not bond properly to old, so the joint is cleaned back first.
Will you leave a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Have rotten timber repaired before new mastic goes in
- Inspect the joints round the windows every year or so
- Keep sills and gutters clear so water drains away
- Plan mastic work ahead of painting
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look before trying a quick fix.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
DIY sealant or a professional job?
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 does not work out, we can still put it right.
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.
Places near Tweedbank
What else we do in Tweedbank
Landlord and commercial work in Tweedbank
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.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
How we quote for sand mastic
The quote reflects the job in front of us. We look at:
- Whether old sealant or filler has to be cut out
- The type of sealant required
- The number and length of the joints
- How many rooms, windows or areas are involved
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What to tell us for a quote
You do not need to know the technical terms. It helps if you can tell us:
- Where the job is, and your postcode
- Any access issues, like height or stairs
- Any previous sealing or DIY work
- If it’s domestic, commercial or a hotel
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.
Surface by surface
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We work on single windows or whole elevations.
Sash and case windows
Most of our sand mastic work is on sash windows. We renew the mastic round each box.
What happens on the day
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. Most jobs take a few hours per window, depending on the condition of the joints. Outdoor work around Tweedbank depends on the weather, as sealant needs a dry surface, so external jobs may need to move if the day turns wet. Indoor work goes ahead whatever the weather.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- 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 earlier repairs to the joints
- Mention any sign-in or site rules at work premises
- Mention any parking rules near the property
How to get a quote
Every job is quoted individually. Simply email us at info@mrmastic.co.uk and describe the job, and pictures are welcome.
Related advice
Common problems we fix in Tweedbank
Water gets into small cracks in the mastic and pushes it out. Exposed elevations normally fail first.
Signs it’s time to call us include:
- Tired mastic found when preparing windows for paint
- Patchy fillers round a sash window
- Weathered mastic on the most exposed windows
- Modern sealant on a period surround
Letting a property close to Tweedbank station? Then any sash windows need sound mastic to keep draughts and rain out.
Comparing quotes
- Who does the work, and how experienced they are
- What the cure time is
- Which colour the sealant will be
- Is VAT in the price?