Angus · Scotland
External Mastic in Unthank
Our applicators work in Unthank on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Cracked joints where brick meets render or frames
- Hard, crazed mastic that has stopped moving
- Failed sealant between panels on a façade
When something else is needed
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Loose or hollow render, which needs re-rendering
- Movement that’s more than a sealant joint can take
- Walls that need new movement joints cut into them
If you are not sure, just email us at info@mrmastic.co.uk and we will give you a straight answer before booking.
What we seal
- Copings & trims
- Concrete & block
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
External mastic in Unthank, done properly
For buildings in Unthank, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. We work on brickwork movement joints, concrete & block and copings & trims, and people most often call us about failed seals between different materials and rain getting behind render or cladding at a joint.
Older stone buildings need a sealant that suits the stone, not an acetoxy product that can mark or attack it. Newer houses need their movement joints and roofline trims kept sound.
Each job carries a 12-month guarantee.
- Location
- Unthank (DD9)
- Wider area
- Angus
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Surface by surface
Copings and trims
A failed coping joint lets water into the top of the wall. Sealing them early saves the wall below.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
How it works
Once we are on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take anything from a few hours to several days, depending on the building. For a place like Unthank, longer drives are planned in advance. Tell us about tracks, gates, a ferry crossing or anything unusual about getting there.
- 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.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Let us know about parking restrictions
- Keep children and pets away from the work area
Getting a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we will take it from there.
Related advice
Unthank: your questions answered
Is external mastic in Unthank guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Is Unthank within the area you cover?
Yes, we do. Our work covers the whole of Scotland, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
What sealant do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Where are you based?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Will the new joint stand out?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We choose the closest to your brick or render so the joint doesn’t draw the eye.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can a movement joint be filled with mortar?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. It needs a flexible sealant over backing rod.
Do you work for hotels and businesses?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Do you need external mastic in Unthank?
Some movement joints have been pointed up with mortar by mistake. The joint can’t move, so the wall cracks somewhere else instead.
Look out for these signs:
- Plants rooting in failed movement joints
- Brick movement joints where the sealant has split
- Weathered mastic that no longer stretches
- Sealant pulling away from one side of the joint
For site and facilities teams at buildings such as Brechin High School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Questions to ask before booking
- Whether they seal over old material or remove it
- What preparation is included
- What happens if the job turns out different
- When the joint can take water or movement
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Outside joints around Unthank
Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and sound outside sealant is part of that. Harled (roughcast) walls are common in Scotland, and where harling meets frames, pipes and other materials, the joint needs a flexible sealant that grips a rough surface.
Homes close to West and St Columba's Parish Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Unthank is about 7 miles west of Montrose, in Angus. Wherever you are in the DD9 postcode area, our applicators can take on external mastic. Unthank is one of 40 places in Angus we cover. There’s also a page for Dundee, about 22 miles away.
Work in DD9 is quoted and booked the same way as anywhere else. We cover properties on Trinity Road, Eddie Avenue and Cookston Road and the roads around them. Other places close to Unthank include Brechin (1 mile south), Little Brechin (2 miles north-west), Edzell (5 miles north), Edzell Woods (5 miles north) and Craigo (6 miles east). We also work in nearby towns such as Arbroath (13 miles south), Forfar (11 miles south-west), Kirriemuir (14 miles west), Letham (9 miles south-west) and Friockheim (7 miles south).
What’s near Unthank
Typical jobs here are in homes near City Road Bar and Brechin Public Park, among other places. A little further out are Brechin Castle (0.9 miles south) and Brechin Town House Museum (0.7 miles south). Open spaces near Unthank include Caterthun and Duns Dish.
Places near Unthank
Also in Unthank
Aftercare tips
A little care helps the new joints last. We recommend:
- Avoid pressure-washing directly into sealant joints
- Get split or bare joints resealed while the damage is small
- Keep water from gutters off the wall
- Ask before painting over external sealant
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
Landlords, agents and businesses in Unthank
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.