Midlothian · Scotland
Dewartown External Mastic
External mastic for Dewartown and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Sealant pulling away from one side of the joint
- Rain getting behind render or cladding at a joint
- Hard, crazed mastic that has stopped moving
About our external mastic in Dewartown
On houses, flats and commercial buildings across Dewartown, we reseal joints in brickwork, render, cladding and façade panels. Every joint gets the same careful preparation: clean joint faces and the right depth. We work on copings & trims, joints between brick and frames and concrete & block, and people most often call us about movement joints with cracked, split or missing sealant and damp patches traced to an open external 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.
Big or small, it’s backed by our one-year guarantee.
- Location
- Dewartown (EH23)
- Wider area
- Midlothian
- Cover
- One year on every job
- Quote
- A clear price before we start
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Aftercare tips
A little care helps the new joints last. Our advice:
- Have failed joints looked at early
- Look over the joints every year, ideally after winter
- Keep soil, plants and ivy away from the joints
- Wash walls gently around the sealant
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
Dewartown: your questions answered
Will you come out to Dewartown?
Yes. Dewartown is within the area we cover, which takes in towns, villages and rural addresses. Our work covers the whole of Scotland. Let us know about access, parking and anything unusual about getting there when you book.
Do you cover Dewartown for external mastic?
Yes. Our work covers the whole of Scotland, and Dewartown is part of that. Just drop us a line at info@mrmastic.co.uk with a few details of the job.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses, and we are fully insured.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we’ll explain our choice.
How do you reach high-level joints?
That depends on how high the joints are and the ground below. Low-level joints are straightforward; for higher work, tell us about the building and we’ll confirm what’s needed.
What is a movement joint?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
Do I have to be there?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Can new sealant go over the old?
No. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render near the open joint, so the damage spreads beyond the joint. When the nearest tradesperson is a drive away, it’s tempting to leave a small leak, but water behind a failed seal does the most damage when nobody’s watching.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Why us?
- Neat joints and a tidy finish
- Anti-fungal sanitary silicone in wet areas
- Colour picked to suit the job
- White, clear, grey or coloured to suit, where the product allows
Take a look at our cost guide and what customers say.
What happens on the day
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes anything from a few hours to several days, depending on the building. Somewhere like Dewartown may be a longer drive, and the journey is planned ahead. Mention tracks, gates, ferries or anything else about the route.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Mention any sign-in or site rules at work premises
- Mention any tricky access
Ask for a quote
For a quote, drop us a line at info@mrmastic.co.uk and tell us where the job is and what the problem looks like. You will have a clear quote before we start.
Read more
What affects the quote in Dewartown
The quote reflects the job in front of us. We take into account:
- The number of rooms or windows
- How much old sealant there is and how hard it is to remove
- The size of the job
- Whether the work is at height
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What to tell us for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- How we’d reach the joints
- The type of property
- Where the job is, and your postcode
- Any previous sealing or DIY work
Want a quote for external mastic? Please drop us a line at info@mrmastic.co.uk and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Different surfaces, different methods
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible.
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that is happened, we rake it out and reseal it properly.
What external mastic looks like in Dewartown
Harled (roughcast) walls are common in Scotland, and joints where harling meets other materials need a sealant that can grip and flex. With historic houses such as Melville Castle (about 4.6 miles west) nearby, there’s older building stock in the area around Dewartown as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Managing a site like Newbattle Community High School? Then its movement joints, gutters and trims need looking after like any other building’s. Historic houses such as Melville Castle, about 4.6 miles west, show how far back building around Dewartown goes. Letting a property close to Gorebridge station? Then split movement joints are easy to miss on a rental until damp shows inside.
Dewartown is about 3 miles south-east of Dalkeith, in Midlothian. We provide external mastic to homeowners, landlords and businesses in Dewartown and nearby, as part of our work across Midlothian. Dewartown is one of 33 places in Midlothian we cover for external mastic. We also work in Edinburgh, around 10 miles away.
All of EH23 is within our area for external mastic. Nearby, we also carry out external mastic in Edgehead (1 mile north-west), Pathhead (1 mile east), D'Arcy (1 mile west), Mayfield (2 miles west) and Easthouses (2 miles north-west). Within a short drive, we also cover Bonnyrigg (4 miles west), Dalkeith (3 miles north-west), Penicuik (9 miles west), Loanhead (6 miles west), Gorebridge (3 miles south-west) and Newtongrange (3 miles west).
Near you in Dewartown
Dewartown’s nearest station is Gorebridge station, about 2.7 miles south-west. Well-known places in the area include Midlothian Community Hospital (3.8 miles west) and Oxenfoord Castle (1.1 miles north-east).
Other services in Dewartown
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
Landlords, agents and businesses in Dewartown
We also work for property managers and facilities teams. Several sites can be quoted together, and we’re fully insured.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.