Glasgow · Scotland
Thornwood Window Mastic
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Thornwood. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- A bead that doesn’t match the frame
- Untidy mastic left by window fitters
- Hard, cracked sealant around windows
Surface by surface
Window sills
Stone and concrete sills have their own joints, including the one between the sill and the frame above. We seal those with a sealant suited to masonry.
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
Window mastic for homes and businesses in Thornwood
Around Thornwood we seal all kinds of frames: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. Common call-outs are for untidy mastic left by window fitters and gaps where the sill meets the wall, across aluminium frames, composite doors and uPVC windows.
Older stone-built tenements in Scotland’s cities were built with sash and case windows, though many have since been replaced. Whether you’re in a tenement flat or a house in Thornwood, the joint between frame and wall is what keeps the weather out.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Thornwood (G11, G51, G12)
- Wider area
- Glasgow
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Work for landlords, hotels and businesses
Landlords and letting agents in Thornwood can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
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.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
How it works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. Most jobs take a morning for a couple of windows and a door. For a tenement in Thornwood, work inside your flat is between us and you, while shared parts may need the factor or neighbours to agree. It helps to know which it is when you get in touch.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away.
- The surfaces are cleaned and left dry.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Move anything stored near the joints
- Let us know if you’ve seen damp or leaks
How to get a quote
To get a quote, send an email to info@mrmastic.co.uk and tell us where the job is and what the problem looks like. We’ll send you a clear quote before any work starts.
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What else we do in Thornwood
Frames and glazing around Thornwood
Sash and case windows are common in older Scottish homes, often pointed into the wall with traditional sand mastic. Thornwood is in the west of Scotland, which is wetter than the east, which means the mastic around window and door frames has to cope with a lot of rain.
For landlords with property near Partick station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. For site and facilities teams at buildings 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. For window mastic in and around Thornwood, it’s easy to get a quote: please email us at info@mrmastic.co.uk. We are based in Crawley and cover Glasgow. Our Glasgow coverage runs to 183 places, and Thornwood is one of them.
Postcode districts we cover here for window mastic: G11, G51 and G12. That includes homes and businesses on Dyce Lane, Morna Lane and Norby Road. You’ll find Thornwood on the A739 and A814, so it’s easy for us to get to. Nearby, we also carry out window mastic in Broomhill (1 mile north-west), Partick (1 mile east), Partickhill (1 mile north-east), Whiteinch (1 mile west) and Hyndland (1 mile north-east). Further out, we also cover 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).
Around Thornwood
In Thornwood, that means 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. Other landmarks nearby include Glasgow Homeopathic Hospital (0.7 miles north) and Glasgow Museum of Transport (1 mile east). Open spaces near Thornwood include Kilmardinny and Castle Hill.
Why act early in Thornwood
Not every sealant suits a window. Interior caulk and bathroom silicone are not made for exterior frame joints. A low-modulus exterior sealant keeps its stretch through hot and cold weather. Private landlords in Thornwood must meet the Repairing Standard, and damp or leaks can fall short of it, so it’s worth fixing failed sealant before a tenant reports it.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
What you get with us
- We leave the area clean and tidy
- An ARBOMaster approved applicator
- More than 20 years in sealant work
- Full insurance on every job
Take a look at what affects the cost or what customers say.
What we are called out for in Thornwood
Joint shape matters as much as the product. A thin smear across a wide gap has nothing to it, while a joint packed solid can’t stretch. Backing rod sets the right depth.
It’s worth asking for a quote if you see:
- Mastic that has split away from the wall
- Black, perished sealant on frames
- Sealant in the wrong colour for the frame
- Gaps left after new windows were fitted
Tenement House, about 2 miles east, is one of the historic houses in the wider area around Thornwood.
Before booking anyone
- What happens if they find a problem under the old sealant
- Whether they seal over old material or remove it
- Who does the work, and how experienced they are
- Which colour the sealant will be
How to look after the new joints
No joint lasts for ever, but care makes a real difference. Our tips:
- Keep paint and stain on wooden frames in good order
- Walk round the house once a year and look at the joints
- Make sure the drainage slots aren’t blocked
- Clean frames with a soft cloth and soapy water
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
Wet, windy weather is when failed mastic shows itself, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
Questions from Thornwood
Do you work for landlords with property near Partick station?
Yes, we work for landlords and agents. You can email us at info@mrmastic.co.uk with the address and a few details, and we’ll give you a fixed price before work begins.
How do repairs to the shared parts of a tenement in Thornwood get organised?
Most tenements arrange shared repairs through the owners or a property factor. 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.
What sealant do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference.
Will resealing my frames help with draughts?
Often, yes. The gap between frame and wall is a common source of draughts, and resealing inside and out closes it.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Is the new sealant paintable?
Silicone generally won’t take paint. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Do the sealants smell?
There can be a smell while the sealant cures. Ventilation helps.