North Lanarkshire · Scotland
Window Mastic in Smithstone
Window mastic for Smithstone, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Mastic that’s falling out in pieces
- Gaps between the frame and the inside reveal
- Cold air getting in at the frame edge
Window mastic in Smithstone, done properly
Most frames have an outside joint and an inside one. Outside, the mastic keeps rain out; the internal joint closes the gap to the plaster and stops draughts. Either or both can be done. We work on window sills, aluminium frames and composite doors, and the jobs we see most are old mastic that has gone black or come away and damp patches on the reveal after heavy rain.
Mastic can only go onto a dry joint, so outside work in Smithstone depends on the weather, and longer journeys are planned in advance. Tell us about access to all the windows and doors, upstairs included.
Each job carries a 12-month guarantee, whatever its size.
- Where
- Smithstone (G68, G65)
- Region
- North Lanarkshire
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Common problems we fix in Smithstone
Frames are never completely still. Sun on a frame makes it expand, and it contracts again overnight, while the brick or render around it hardly moves. If the sealant can’t stretch, it splits.
Most people get in touch after spotting something like this:
- Cold air getting in at the frame edge
- Cracked or shrunken mastic around the frame
- Gaps where the sill meets the wall
- A bead that doesn’t match the frame
Letting a property close to Croy station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What to look for in a quote
- Is the old sealant removed completely?
- Whether you can choose the colour
- What guarantee comes with the work
- What preparation is included
Landlord and commercial work in Smithstone
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will quote.
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Towns and villages near Smithstone
What else we do in Smithstone
Why deal with it now?
Running fresh sealant over the old joint is tempting, but it will not grip old, dirty sealant. It soon lifts and the leak carries on behind it. The old mastic has to come out. In an older home around Smithstone, damp from a failed joint can get into timber and plaster.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
What you get with us
- Rated 4.9 stars on Google
- Colour picked to suit the job
- Over 20 years’ experience
- Arbo and Everbuild products
Common questions in Smithstone
Can you do window mastic in Smithstone?
Yes. Our work covers the whole of Scotland, and Smithstone is part of that. Just drop us a line at info@mrmastic.co.uk with a few details of the job.
I let a flat near Croy 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 quote.
Can you seal over the old sealant?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Do I have to be there?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Do you have sealant for grey or black windows?
Yes. White, brown, anthracite grey, black and clear sealants are all available.
Do you have insurance?
Yes. Full insurance covers our work.
Can I paint over the new sealant?
It depends on the sealant. Silicone is not paintable, but some hybrid sealants are. Mention any painting plans before we start.
How much does window mastic cost in Smithstone?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
How to look after the new joints
To keep the joints looking good and working properly:
- Don’t aim a pressure washer at the joints
- Wipe condensation off the frames
- Clear any debris from frame drain holes
- Do not use solvent cleaners on the joint
Silicone can’t generally be painted, so mention any painting plans before any work starts. We can use a paintable sealant where that matters.
Water trapped behind a failed joint can start rot in timber frames and sills. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.
Should I try it myself first?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
Smithstone homes and the weather
Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that. Smithstone 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.
If you look after a building such as Our Lady's High, its window and door frames need their mastic kept sound, just like a home’s.
Smithstone is about 1 mile west of Cumbernauld, in North Lanarkshire. Whether you’re in the middle of Smithstone or further out, window mastic is available for homes and businesses alike. Smithstone is one of 89 towns and villages in North Lanarkshire where we work. Our Glasgow page covers work nearby, about 11 miles away.
Here we cover the G68 and G65 postcode area for window mastic. If you need window mastic at a property on Taggart Road, Blackwood Road and Old Tower Road or anywhere close by, we can help. Neighbouring places we cover for window mastic include Balloch (1 mile east), Croy (1 mile north), Craigmarloch (1 mile north-east), Auchinstarry (1 mile north-west) and Westfield (1 mile south). Within a short drive, we also cover Motherwell (11 miles south), Coatbridge (7 miles south), Airdrie (6 miles south), Wishaw (13 miles south), Bellshill (9 miles south) and Burnfoot (6 miles south).
Landmarks near Smithstone
Smithstone has its own railway station: Croy station. Nearby you’ll also find Antonine Centre (1.8 miles east) and Cumbernauld Castle (2.7 miles east). Open spaces near Smithstone include Bar Hill and Antermony Loch.
How the visit works
Once we’re on site, 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 handful of frames, longer for a whole house. Outdoor work around Smithstone depends on the weather, as sealant needs a dry surface, so an outdoor job can move if the forecast changes. Work indoors isn’t affected.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
How to prepare
- Move anything stored near the joints
- Let us know about parking restrictions
- Tell us about any water getting in
Get a quote
Want a quote for window mastic? Please drop us a line at info@mrmastic.co.uk with a few details. We will explain what we’d do and give you a clear quote before any work starts.
Related advice
What affects the quote in Smithstone
The quote reflects the job in front of us. We look at:
- Mould in or behind the old joints
- The product the joint needs
- How many areas need sealing
- When we can work, for business premises
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Photos by email, if that’s easy
- The address or postcode of the job
- Whether it has been sealed before
- What’s wrong with the joints now
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.