Edinburgh · Scotland
External & façade joints in Bonaly, Edinburgh
External mastic across Bonaly and nearby, with every bit of old sealant taken out first and a one-year guarantee.
- Failed seals between different materials
- Brick movement joints where the sealant has split
- Moss and dirt in joints with no sealant left
Leave it or put it right?
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. In a place like Bonaly, small leaks are easy to put off, but water through a failed joint keeps working away until it’s fixed.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why Bonaly clients choose us
- 4.9 on Google from 180+ five-star reviews
- Homes, businesses and hotels
- Old sealant always removed completely
- Full insurance on every job
See what affects the cost or our reviews.
How we handle external mastic in Bonaly
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. If you have joints pointed up with cement by mistake and sealant pulling away from one side of the joint, we can help, whatever the surface.
External sealant needs dry surfaces, so outdoor work around Bonaly is planned around the weather. Tell us how to reach each wall, gutter and roofline.
Big or small, it’s backed by our one-year guarantee.
- Place
- Bonaly (EH13)
- Wider area
- Edinburgh
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Do not let climbing plants root in the sealant
- Make sure movement joints are not pointed over
- Look over the joints every year, ideally after winter
- Point out the joints to other trades
Don’t paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
Common questions in Bonaly
Is Bonaly in your area for external mastic?
Yes. We work across all of Scotland, and Bonaly is part of that. Just drop us a line at info@mrmastic.co.uk with a few details of the job.
Can you help a landlord with a rental near Kingsknowe station?
Yes. We work for letting agents and landlords as well as homeowners. Just email us at info@mrmastic.co.uk with the address and what needs doing, and we will send you a clear quote.
How long will you be here?
Typically it takes a few hours to a few days, depending on the length of joint and the access. Bigger jobs take longer, and we will say how long yours will take.
Should I point up the gap in my brickwork?
No. Rigid materials can’t move with the wall. Where a joint has been mortared, it can often be raked out and sealed properly.
Do you take out the old sealant first?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures.
Can you match the colour of my brickwork?
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 it does not stand out.
What external mastic looks like in Bonaly
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. Edinburgh’s Old and New Towns are a UNESCO World Heritage Site, and the Georgian New Town is known for its sash windows. For listed homes and conservation areas, check with the council before changing how windows or walls look.
If you let a flat or house near Kingsknowe station, outside joints that have cracked can let damp into a rental, so check them between lets. In the older streets around Colinton Parish Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Bonaly is about 3 miles south-west of Merchiston, in Edinburgh. Whether you’re in the middle of Bonaly or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Bonaly is one of 175 towns and villages in Edinburgh where we work.
Work in EH13 works the same way as everywhere else we cover. If you need external mastic at a property on Bonaly Road, Bonaly Avenue and Munro Drive or a nearby road, our applicators can take on the job. We also cover the places around Bonaly: Torphin (1 mile west), Swanston (2 miles east), Milton Bridge (4 miles south-east), Penicuik (5 miles south) and Silverburn (5 miles south). Larger places within reach include Edinburgh (4 miles north-east), Leith (7 miles north-east), Bonnington (6 miles north-east), Greenside (5 miles north-east), Broughton (5 miles north-east) and Bellevue (5 miles north-east).
Local landmarks in Bonaly
Around Bonaly, our work takes us to homes and buildings near Juniper Green Parish Church and Firrhill High School. The closest station to Bonaly is Kingsknowe station, about 1.6 miles north of the centre. Well-known places in the area include War Poets Collection (2.3 miles north-west) and Craiglockhart Hydropathic (1.7 miles north-east). The countryside around Bonaly includes White Hill and The New Leaf Co-op.
How it works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes a few hours to a few days, depending on the length of joint and the access from start to finish. Outside jobs in Bonaly need a dry day, because sealant will not bond to a wet joint, so external jobs may need to move if the day turns wet. Indoor work goes ahead whatever the weather.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Mention any parking rules near the property
- Mention if the joints have been sealed before
- Mention any sign-in or site rules at work premises
Get a quote
Getting a quote is simple: let us know what needs doing and where. A few pictures by email make the job easier to understand.
Related advice
DIY sealant or a professional job?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Towns and villages near Bonaly
More services for Bonaly
What sealant work cannot fix
We’ll always be straight with you, so here’s what sealant cannot fix:
- Movement that’s more than a sealant joint can take
- Failed render or damaged cladding panels
- Rising or penetrating damp from elsewhere in the wall
If in doubt, email us at info@mrmastic.co.uk and we’ll say what we think before booking.
Surfaces we seal
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
- Façade panels
- Concrete & block
- Copings & trims
Landlords, agents and businesses in Bonaly
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
We work for landlords and letting agents as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
Do you need external mastic in Bonaly?
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
Keep an eye out for any of the following:
- Rain getting behind render or cladding at a joint
- Joints pointed up with cement by mistake
- Sealant that has lost its bond to the brick or render
- Panel joints letting water in
If you look after a building such as Army School of Bagpipe Music and Highland Drumming, larger buildings have long runs of movement joint that eventually need resealing.
Before you book anyone
- Whether the sealant suits the joint
- What happens if the job turns out different
- How the colour is chosen
- What insurance they hold