Glasgow · Scotland
External Mastic in Thornwood
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Thornwood. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Rain getting behind render or cladding at a joint
- Joints where the bead has come unstuck
- Joints pointed up with cement by mistake
Walls and rooflines in Thornwood
The west of Scotland is wetter than the east, so there’s plenty of rain for movement joints and outside wall joints to keep out. Glasgow’s tenements are largely red and blond sandstone, and sandstone is porous, so any sealant against it has to be one that won’t stain or attack it.
If you let a flat or house near Partick station, outside joints that have cracked can let damp into a rental, so check them between lets. Tenement House, about 2 miles east, is one of the historic houses in the wider area around Thornwood, and older homes nearby need a sealant that suits their walls.
Thornwood is about 2 miles north-west of Glasgow, in Glasgow. For external mastic in and around Thornwood, please email us at info@mrmastic.co.uk for a quick quote. We’re based in Crawley and cover Glasgow. Our Glasgow coverage runs to 183 places, Thornwood among them.
Our applicators cover all of the G11, G51 and G12 postcode area for external mastic and the streets around it. You’ll find streets such as Dyce Lane, Morna Lane and Norby Road. Thornwood is on the A739 and A814, so it’s easy for us to get to with everything needed for external mastic. 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). We also work in nearby towns such as 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. There’s a railway station in Thornwood itself: 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.
About our external mastic in Thornwood
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we’ll confirm what’s needed to reach them safely. We are often asked to deal with failed sealant between panels on a façade and rain getting behind render or cladding at a joint, across copings & trims, joints between brick and frames and render & cladding joints.
Scotland’s cities also have plenty of modern blocks with rendered or clad walls and sealed movement joints. In Thornwood, those joints dry out over time and let water in behind the render or cladding.
Every job is covered by a 12-month guarantee, wherever you are in Glasgow.
- Place
- Thornwood (G11, G51, G12)
- Wider area
- Glasgow
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
How we quote for external mastic
For a quick quote, just ask. The main things that affect it are:
- How many areas need sealing
- How easy the joints are to reach
- The old material and how stubborn it is
- Which sealant suits the joint
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Helping us quote
You do not need to know the technical terms. It helps if you can tell us:
- The type of property
- The problem you’ve noticed
- How many joints, rooms or windows are involved
- Where the property is
If you’re in Thornwood and need external mastic, send an email to info@mrmastic.co.uk. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
For landlords and businesses
We also work for property managers and facilities teams in Thornwood and across Glasgow. Several sites can go on one quote.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Signs you need external mastic in Thornwood
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
Keep an eye out for any of the following:
- Rain getting behind render or cladding at a joint
- Weeds or debris growing in open joints
- Hard, crazed mastic that has stopped moving
- Failed seals between different materials
Schools such as Thornwood Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Comparing quotes
- Whether you can choose the colour
- How the joint is cleaned and prepared
- What insurance they hold
- What the quote includes, VAT included or not
Aftercare tips
A little care helps the new joints last. Our advice:
- Deal with leaking gutters that soak the joints below
- Tell anyone working on the walls about the movement joints
- Have failed joints looked at early
- Do not let climbing plants root in the sealant
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges over time.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick.
Should I try it myself first?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
What else we do in Thornwood
What we do, step by step
You do not need to clear the whole room or building before we come, only the area right around the joints. Everything nearby is protected, and the work takes a few hours for a handful of joints, longer for a whole elevation for a typical job. 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.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Let us know about earlier repairs to the joints
- Clear the area around the work
- Let us know about stairs, lifts or work at height
How to get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we’ll explain what’s involved.
Advice
FAQs for Thornwood
How do repairs to the shared parts of a tenement in Thornwood get organised?
Shared parts of a tenement, such as the roof and outside walls, are normally repaired with the agreement of the owners, often through a property factor. Where the title deeds are silent, the Tenements (Scotland) Act 2004 fills the gaps. Your title deeds will say who owns the windows.
Do you work for landlords with property near Partick station?
Yes, rental work is part of what we do. You can send an email to info@mrmastic.co.uk with the address and a few details, and we will give you a fixed price before we start.
What sealant do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Why is there a gap in my brick wall?
A vertical gap in a long brick wall is generally a movement joint. It lets the bricks expand without cracking and needs a flexible seal, not mortar.
Can new sealant go over the old?
No, because it fails. We remove every bit of old sealant first.
What does external mastic cost?
It depends on the job, so we quote each one individually. To get one, drop us a line at info@mrmastic.co.uk and tell us what needs doing and where.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
Is there any odour?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
What sealant work cannot fix
We will always be straight with you, so here’s what sealant can’t fix:
- Walls that need new movement joints cut into them
- Failed render or damaged cladding panels
- Movement that is more than a sealant joint can take
If you are not sure, just drop us a line at info@mrmastic.co.uk and we will give you a straight answer before booking.
Surfaces we seal
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
- Concrete & block