Glasgow · Scotland
Sand mastic for sash & case windows in Thornwood, Glasgow
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Thornwood and across Glasgow. 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
- Cracked mastic round a front door frame
How it works
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours for a single window, longer for several. In a city area like Thornwood, parking may be by permit or pay-and-display, so tell us what’s nearby. If you are in a flat, let us know how we get in at the street door.
- 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.
How to prepare
- Keep pets and children clear of the area while we work
- Mention any tricky access
- On commercial sites, let us know about site rules
Getting a quote
To get a quote, send an email to info@mrmastic.co.uk with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Advice
How we handle sand mastic in Thornwood
Silicone on a period window often looks wrong and does not suit the building. Sand mastic gives a finish that matches the age of the house and we can swap the silicone for it. Typical jobs include tired mastic found when preparing windows for paint and a silicone bead on a sash window that spoils the look, across sash and case windows, brick reveals and stone surrounds.
Thornwood is in one of Scotland’s four big cities, where many older buildings are sandstone or granite. Stone needs a sealant that suits it, so acetoxy silicones, which can attack some stone, are best avoided.
Our work is backed for twelve months, in Thornwood and everywhere else we cover.
- Location
- Thornwood (G11, G51, G12)
- Region
- Glasgow
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
Thornwood homes and the weather
Glasgow’s tenements are largely red and blond sandstone, and porous sandstone needs a sealant that will not mark it. Under the Tenements (Scotland) Act 2004, shared parts of a tenement, such as the roof and outside walls, are looked after by the owners together, often through a property factor. Windows normally belong to the flat, but the title deeds have the final say.
Tenement House, about 2 miles east, is one of the historic houses in the wider area around Thornwood. If you look after a building such as Thornwood Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Thornwood is about 2 miles north-west of Glasgow, in Glasgow. Wherever you are in the G11 postcode area, we cover sand mastic for homes and businesses. Our area takes in 183 places across Glasgow.
All of G11, G51 and G12 is within our area for sand mastic, from the main roads to the quietest streets. That includes homes and businesses on Dyce Lane, Morna Lane and Norby Road. Main roads around Thornwood include the A739 and A814. Other places close to Thornwood include Broomhill (1 mile north-west), Partick (1 mile east), Partickhill (1 mile north-east), Whiteinch (1 mile west) and Hyndland (1 mile north-east). Larger places within reach include Calton (4 miles east), Langside (4 miles south-east), Yoker (3 miles north-west), Mount Florida (4 miles south-east), Hillpark (4 miles south) and Shawlands (3 miles south-east).
Landmarks near Thornwood
Around Thornwood, our work takes us to homes and buildings near Victoria Park, Ladywell School and St Peter's Boys School, among other places. Thornwood has its own railway station: Partick station. Well-known places in the area include Glasgow Homeopathic Hospital (0.7 miles north) and Glasgow Museum of Transport (1 mile east). Green spaces nearby include Kilmardinny and Castle Hill.
Why deal with it now?
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic suits the building and finishes neatly against the masonry. In a tenement flat in Thornwood, a failed seal is rarely just your problem: water can reach the flat below, and gaps in shared walls or fire-stopping affect the whole stair.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Ask us for a quote and we will explain what it covers.
Why Thornwood clients choose us
- We are fully insured
- Quality sealants from Arbo and Everbuild
- More than 20 years in sealant work
- Homes, businesses and hotels
Take a look at how sealant jobs are priced or what customers say.
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Check the mastic when you check the paintwork
- Ask the planning authority about consent for listed or conservation-area homes
- Ask us before painting near the mastic
- Sort the mastic before the decorators arrive
Leave the new mastic unpainted, as traditional guidance advises. If you’re redecorating, ask us first.
Sound mastic protects the frame. Once it fails, water can sit against the timber, which can lead to rot.
What we can’t put right
We won’t take on work that will not last, so here’s what sealant cannot put right:
- Sashes that rattle, stick or will not open
- Broken panes
- Decayed frames that need repair
If in doubt, send an email to info@mrmastic.co.uk and we will say what we think before you book.
Surfaces we seal
- Stone surrounds
- Tenement windows
- Period & listed homes
- Brick reveals
- Timber door frames
- Sash and case windows
DIY versus a professional finish
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again.
When to call us in Thornwood
Some old mastic was never deep enough. A thin layer does not hold well so we make sure the new mastic is the right thickness.
People usually contact us when they notice something like this:
- Mastic dropping out of the joint
- Cement or filler used on old window joints that has cracked
- Draughts and rain around sash boxes
- Mastic that needs renewing before redecorating
Letting a property close to Partick station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
What your quote should include
- How the surfaces are prepared before sealing
- What insurance they hold
- Who turns up on the day
- How long the guarantee is
What affects the cost of sand mastic
The price is agreed before any work begins. It’s based on:
- Whether the work is at height
- How many rooms, windows or areas are involved
- The old material and how stubborn it is
- The size of the job
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What we need to know
To make quoting easier, please include:
- Any access issues, like height or stairs
- Roughly how big the job is
- What’s wrong with the joints now
- Where the job is, and your postcode
For sand mastic in Thornwood, drop us a line at info@mrmastic.co.uk. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Questions from Thornwood
How do repairs to the shared parts of a tenement in Thornwood get organised?
It usually goes through the owners together, or through the factor if the building has one. The Tenements (Scotland) Act 2004 sets the rules for common parts if the deeds don’t, and we can quote for the factor or the owners directly.
Is Thornwood in your area for sand mastic?
Yes. Our work covers the whole of Scotland, and Thornwood is part of that. You can drop us a line at info@mrmastic.co.uk and tell us what needs doing, and we’ll give you a clear quote.
Do you take out the old sealant first?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Which is right for my windows, sand mastic or modern sealant?
We will talk it through with you. Period homes often look best with sand mastic, and modern sealants suit newer frames.
Can you match the sealant colour?
We help you choose a colour that suits, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Which products do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We’ll tell you what we’re using and why.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us, and we are fully insured.