Dundee · Scotland
External & façade joints in St Marys, Dundee
External mastic for St Marys and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Gaps where render, brick and frames meet
- Sealant pulling away from one side of the joint
- Leaking joints around cladding and façade panels
DIY sealant or a professional job?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again.
If you are set on DIY, put the effort into 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.
How we handle external mastic in St Marys
Low-level joints can usually be done from the ground. For joints higher up, give us some details of the building and we will confirm what access is needed. If you’re dealing with failed sealant between panels on a façade and weeds or debris growing in open joints, we can help, whatever the surface.
Stone-built tenements in Scotland’s cities share their roof, gutters and outside walls between every flat in the building. In St Marys, work on shared parts of a tenement is normally agreed between owners, often with a factor arranging it.
All our work is covered by our 12-month guarantee.
- Where
- St Marys (DD3, DD2)
- Region
- Dundee
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
When to call us in St Marys
If plants are growing out of a joint, the sealant has normally failed or was never there. Dirt and roots then trap moisture in the joint and make things worse.
Common reasons people contact us include:
- Joints with sealant missing in places
- Joints pointed up with cement by mistake
- Old sealant gone brittle and cracked
- Rain getting behind render or cladding at a joint
Camperdown House, about 1.2 miles south-west, is one of the historic houses in the wider area around St Marys.
Before booking anyone
- Is the old sealant removed completely?
- How the surfaces are prepared before sealing
- What the quote includes, VAT included or not
- How long the guarantee is
Surface by surface
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. We size the backing rod to the gap.
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joints work hard every day. We choose the product to suit.
The process
We bring everything the job needs with us. After a quick look at the joints together, the area is protected and the work begins. It normally takes anything from a few hours to several days, depending on the building. Inside a flat in St Marys, 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 look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- Let us know if you’ve seen damp or leaks
- Try not to wet indoor joints just before the visit
- Tell us about any previous sealing or DIY attempts
Getting a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, email us at info@mrmastic.co.uk.
Advice
Leave it or put it right?
Water gets in through a failed movement joint, behind render and cladding. Dealing with it early keeps the repair to the joint, instead of the wall and finishes around it. Scottish rain finds any gap around a frame or wall joint, and in St Marys, damp can spread through stone and plaster before anyone sees it.
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.
What you get with us
- Approved under the ARBOMaster scheme
- 20+ years of sealant experience
- Neat joints and a tidy finish
- Sealant colour chosen to suit
Take a look at our cost guide and customer reviews.
Nearby places to St Marys
What else we do in St Marys
For landlords and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
In hotels, rooms out of use cost money, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
Outside joints around St Marys
St Marys is within about 3 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. Plenty of Scottish homes have harled walls, and where harling meets frames, pipes and other materials, the joint needs a flexible sealant that grips a rough surface.
Schools such as Lawside Academy are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. Rented homes near Invergowrie station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
St Marys is about 2 miles north-west of Dundee, in Dundee. For external mastic in and around St Marys, it’s easy to get a quote: please send an email to info@mrmastic.co.uk. We’re based in Crawley and cover Dundee. St Marys is one of 50 places in Dundee we cover for external mastic.
Our applicators cover all of the DD3 and DD2 postcode area for external mastic and the streets around it. Streets in the area include Troon Road, Troon Avenue and Gullane Road, and we cover them all. If you are just outside St Marys, we cover Ardler (1 mile south), Dryburgh (1 mile south), Camperdown (1 mile south-west), Lochee (1 mile south) and Birkhill (2 miles west). Further out, we also cover Broughty Ferry (6 miles east), Stobswell (3 miles south-east), Monifieth (7 miles east), Barnhill (6 miles east), Pitkerro (3 miles east) and Whitfield (3 miles east). As one of the bigger places in Dundee, St Marys has homes, rented property and businesses of every kind.
Local landmarks in St Marys
We work in homes and buildings around Cox Branch Library and Balgay Hill, among other places. St Marys’s nearest station is Invergowrie station, about 3 miles south-west. Nearby you will also find Wellgate Centre (2.6 miles south-east) and Strathmartine Castle (1.5 miles north). Open spaces near St Marys include Balgay Hill and Trottick Mill Ponds.
Your questions about external mastic in St Marys
Do you work for landlords with property near Invergowrie station?
Yes, we work for letting agents and landlords. You can drop us a line at info@mrmastic.co.uk with the address and a few details, and we will give you a fixed price before work begins.
Does living near the coast affect external mastic in St Marys?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover St Marys.
What’s an expansion joint in brickwork?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking, and it should be sealed with a flexible sealant.
Can you work on commercial sites?
Yes, regularly. Larger jobs can be planned room by room or area by area.
Can you seal joints between two different materials?
Yes. Joints between dissimilar materials are a big part of external work. The sealant is chosen to bond to both sides.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Do you cover St Marys?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland, and that includes St Marys.
Quotes for external mastic in St Marys
Some jobs are bigger than they look, and some smaller. The main factors:
- Which sealant suits the joint
- Any working-time requirements on site
- Whether there’s mould to deal with
- The old material and how stubborn it is
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Asking for a quote
To make quoting easier, please include:
- Any previous sealing or DIY work
- Roughly how big the job is
- Any access issues, like height or stairs
- Where the property is
We quote each job on its own. Just send an email to info@mrmastic.co.uk with the details and send pictures if you have them.