Glasgow · Scotland
Window & door mastic in Cadder, Glasgow
Window mastic in Cadder from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- White mastic on grey or black frames
- Leaking joints at the ends of sills
- Old mastic that has gone black or come away
When it is not the sealant
A few problems are outside what sealant work can do:
- Worn gaskets, brush seals or a door that has dropped
- Condensation trapped between the panes
- A frame that has rotted at the joint
If in doubt, email us at info@mrmastic.co.uk and we’ll say what we think.
Surfaces we seal
- Aluminium frames
- uPVC windows
- Window sills
- Timber windows & doors
- Composite doors
- Patio & French doors
About our window mastic in Cadder
Every window and door frame has a gap around it, and mastic is what closes it. When it cracks, hardens or pulls away, draughts and rain get in. Our applicators cut it out and replace it with a flexible, weatherproof sealant. Common call-outs are for draughty joints inside around the window and water coming in at the bottom corners of a door, on timber windows & doors, aluminium frames and patio & French doors.
Older stone-built tenements in Scotland’s cities were built with sash and case windows, though many have since been replaced. In Cadder, as anywhere, the mastic between frame and wall is what stops draughts and rain getting in.
Big or small, it’s backed by our one-year guarantee in Cadder and across Glasgow.
- Location
- Cadder (G20, G23, G22)
- Wider area
- Glasgow
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
What we are called out for in Cadder
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.
Look out for any of the following:
- White mastic on grey or black frames
- Gaps left after new windows were fitted
- Whistling draughts around closed windows
- Cracked or shrunken mastic around the frame
Tenement House, about 2.1 miles south, is one of the historic houses in the wider area around Cadder.
What your quote should include
- Whether they’re fully insured
- What happens if they find a problem under the old sealant
- How the joint is cleaned and prepared
- Whether all the old sealant comes out first
Nearby places to Cadder
Other services in Cadder
Questions from Cadder
Is Cadder in your area for window mastic?
Yes, Cadder is within the area we cover. We work across all of Scotland. Just send an email to info@mrmastic.co.uk with a few details of the job, and we’ll give you a clear price.
I let a flat near Gilshochill station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just send an email to info@mrmastic.co.uk with the address and what needs doing, and we’ll give you a clear quote.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
Does the work come with a guarantee?
Yes. Every job comes with our 12-month guarantee, and we’re ARBOMaster approved applicators.
Should I try DIY first?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Can you seal the gap between the frame and the plaster indoors?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We do one or both.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
Do the sealants smell?
There can be a smell while the sealant cures, which fades as it sets. Opening a window helps.
Window mastic in Cadder: local notes
Much of Glasgow is built from red and blond sandstone, and porous sandstone needs a sealant that will not mark it. 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.
If you look after a building such as John Paul Academy, larger buildings have plenty of frames, and the mastic around each one ages. Letting a property close to Gilshochill station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Cadder is about 1 mile north of North Kelvinside, in Glasgow. Our applicators cover window mastic for homes and businesses in Cadder and the surrounding area, as part of our work across Glasgow. Our area takes in 183 places across Glasgow, from the larger towns to small villages.
Every address in G20, G23 and G22 is covered for window mastic, from the main roads to the quietest streets. That includes homes and businesses on Cadder Road, Tresta Road and Hillend Road. With the A879 close by, Cadder is simple for us to get to for window mastic. Close by, we work in Gilshochill (1 mile south-west), Lambhill (1 mile south-east), High Ruchill (1 mile south), Maryhill (1 mile west) and Ruchill (1 mile south). Larger places within reach include Glasgow (3 miles south), Calton (4 miles south-east), Langside (5 miles south), Yoker (4 miles west), Mount Florida (5 miles south) and Hillpark (6 miles south).
Near you in Cadder
Typical jobs here are in homes near Glasgow University Library and Dawsholm Park and the streets around them. Cadder has its own railway station: Gilshochill station. Nearby you’ll also find Chinatown (2.1 miles south) and Ruchill Hospital (0.9 miles south-east). Open spaces near Cadder include Bardowie Loch and Castle Hill.
Quotes for window mastic in Cadder
The quote reflects the job in front of us. We take into account:
- The old material and how stubborn it is
- How easy the joints are to reach
- The number and length of the joints
- The type of sealant required
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
What we need to know
Photos by email are helpful but not essential. Please mention:
- If someone has resealed it before
- A few photos by email, if you can
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
Asking for a quote is easy: let us know the job and the location. A few photos by email make the job easier to understand, and we will come back to you with a quote.
What happens if it’s left?
Resealing frames is a short job: the visit takes a few hours for a few frames, or a day or more for a whole house. Wait for damp to appear and there may be plaster and decorating to sort out too. For landlords in Cadder, damp and leaks can be a Repairing Standard issue, so it’s worth fixing failed sealant before a tenant reports it.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why book with us
- More than 20 years in sealant work
- Tidy, careful work
- We’re fully insured
- We never seal over old sealant
See what affects the cost and our reviews.
What we do, step by step
We bring everything the job needs with us, so you do not need to buy or prepare anything. Once we’ve agreed what’s being done, the area is protected and the work begins. It normally takes a few hours for a few frames, or a day or more for a whole house. Inside a flat in Cadder, the job is planned with you; outside, shared parts may need the factor or other owners involved. Tell us which applies when you book.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely, along with any loose debris.
- 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.
- We tool the joint so water runs off, then clear up.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any water getting in
- Move anything stored near the joints
Get a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Advice
For landlords and businesses
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 that we can handle for you.
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. Our tips:
- Wipe condensation off the frames
- Repaint timber before it’s bare
- Do not use solvent cleaners on the joint
- Walk round the house once a year and look at the joints
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
A failed joint lets water into the wall a little at a time. Often the first sign is a damp patch inside or flaking paint on the reveal. Early resealing stops it reaching that point.