North Lanarkshire · Scotland
Glenboig Window Mastic
Window mastic in Glenboig from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Mastic that has split away from the wall
- Cracked internal joints between frame and plaster
- Rushed sealant from a window installation
Window mastic in Glenboig
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We are fully insured ARBOMaster approved applicators, and we give a one-year guarantee on the work. We work on uPVC windows, patio & French doors and window sills, and the jobs we see most are gaps left after new windows were fitted and gaps between the frame and the inside reveal.
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.
Big or small, it’s backed by our one-year guarantee in Glenboig and across North Lanarkshire.
- Location
- Glenboig (ML5)
- Region
- North Lanarkshire
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Don’t aim a pressure washer at the joints
- Keep timber frames painted
- Walk round the house once a year and look at the joints
- Clean frames with a soft cloth and soapy water
Check the drainage slots in the frames aren’t blocked, so rain drains out rather than building up at the sealant.
Look out for the warning signs: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. Any of these is worth a call.
DIY versus a professional finish
If you’re 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 fails, we can still redo it.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Different surfaces, different methods
Window sills
Stone and concrete sills have their own joints, and the joint under the frame can let rain run behind. We seal those with a sealant suited to masonry.
Composite doors
Composite doors are normally hung in an uPVC-type frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.
What happens on the day
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes most of a day for a typical house, less for a few frames, and the area is left clean. In smaller Scottish places, parking is normally less of an issue than access and distance. Let us know how to find you and how to reach the joints.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
Preparing for the visit
- Clear items away from the joints we are working on
- For business premises, tell us about site rules or sign-in
- Tell us about any previous sealing or DIY attempts
Getting a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email photos if that is easy.
Read more
Signs you need window mastic in Glenboig
On timber frames, paint and putty build up around the joint. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
Most people get in touch when they notice one of these:
- Cracked or shrunken mastic around the frame
- Rain getting in at the frame or under the sill
- Cracked internal joints between frame and plaster
- Untidy mastic left by window fitters
If you live in an older home near Church Of Scotland, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
What to look for in a quote
- How long to leave it before use
- How the joint is cleaned and prepared
- How hidden problems are handled
- Are they insured?
Glenboig homes and the weather
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 sound outside sealant is part of that.
If you let a flat or house near Gartcosh station, renewing tired window mastic between tenants heads off draught and damp complaints. Managing a site like Buchanan High School? Then the mastic around its windows and doors needs looking after like any other building’s.
Glenboig is about 3 miles north of Coatbridge, in North Lanarkshire. Whether you’re in the middle of Glenboig or further out, we cover window mastic for every kind of property. Glenboig is one of 89 places in North Lanarkshire where we work. Glasgow is on our list too, around 9 miles away.
Every address in ML5 is within our area for window mastic, from the main roads to the quietest streets. You’ll find streets such as Main Street, Rockbank Crescent and Carrick Place. Close by, we work in Marnoch (1 mile west), Gartcosh (2 miles west), Muirhead (2 miles west), Coatbridge (3 miles south) and Bargeddie (3 miles south-west). Within a short drive, we also cover Motherwell (7 miles south), Cumbernauld (4 miles north-east), Airdrie (3 miles south-east), Wishaw (9 miles south-east), Bellshill (5 miles south) and Kilsyth (6 miles north).
Local landmarks in Glenboig
The closest station to Glenboig is Gartcosh station, about 1.5 miles west. Nearby you’ll also find Monklands Hospital (2.5 miles south-east) and Glasgow Fort (4 miles south-west). For a walk, there’s Gadloch and Bar Hill.
Questions from Glenboig
Can you do window mastic in Glenboig?
Yes, Glenboig is within the area we cover. Our work covers the whole of Scotland. You can drop us a line at info@mrmastic.co.uk and tell us what needs doing, and we’ll give you a clear price.
I let a flat near Gartcosh station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just drop us a line at info@mrmastic.co.uk with the address and what needs doing, and we’ll give you a clear price.
Will resealing my frames help with draughts?
Yes, if the air is getting in around the frame. If it’s coming through the window seals, we will tell you.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Does the work come with a guarantee?
Yes. Each job is covered for 12 months, inside or out.
Are you insured?
Yes. We’re fully insured, with over 20 years’ experience in sealant work.
Where is Mr Mastic based?
Our base is Crawley. We work across South East England, London and Scotland.
Can I paint over the new sealant?
Not usually, if it’s silicone. Tell us your decorating plans and we will pick a sealant to suit.
Places near Glenboig
What else we do in Glenboig
What affects the quote in Glenboig
The price is agreed before any work begins. It takes into account:
- The product the joint needs
- The number and length of the joints
- Whether old sealant or filler has to be cut out
- When we can work, for business premises
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first and agree the price before starting.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Whether it’s a home or a business
- A few pictures by email, if you can
- Roughly how big the job is
- Access, such as stairs, a lift or height
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, email us at info@mrmastic.co.uk.
What sealant work can’t fix
We will always be straight with you, so here’s what sealant can’t fix:
- Rotten timber, which needs a joiner first
- Penetrating damp from a failed cavity tray or render
- Condensation trapped between the panes
Not sure which it is? You can email us at info@mrmastic.co.uk and we will tell you honestly.
Where we work in Glenboig
- Aluminium frames
- Timber windows & doors
- Composite doors
- Patio & French doors
- uPVC windows
- Window sills