Edinburgh · Scotland
Mountcastle External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Mountcastle, with a 12-month guarantee on every job. Call for a quick quote.
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
- Damp patches traced to an open external joint
Questions from Mountcastle
Is external mastic in a coastal place like Mountcastle any different?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. The right product, a clean joint and the right depth all help it cope.
I let a flat near Brunstane station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can be quoted together. Just drop us a line at info@mrmastic.co.uk with the address and what needs doing, and we will give you a clear quote.
Will you leave a mess?
Tidy work is part of the job. Nearby surfaces are protected, and the area is left clean when we finish.
How long will you be here?
It depends on the size of the job, but most jobs take a few hours to a few days, depending on the length of joint and the access. We will give you a better idea when we quote.
Is it OK to fill a movement joint with cement?
No, not if it’s a movement joint. Pointing it stops it working. We will reseal it with a flexible sealant.
Can I add another job to the visit?
Yes, and it often makes sense. Doing several areas at once is generally more efficient, so mention them when you ask for a quote.
Is it worth trying it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
Why is there a gap in my brick wall?
A vertical gap in a long brick wall is normally a movement joint. It gives the wall room to move, and it should be sealed with a flexible sealant.
About our external mastic in Mountcastle
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing, and we do not skip that step. If you are dealing with moss and dirt in joints with no sealant left and sealant that has lost its bond to the brick or render, we can put it right.
On a four-storey tenement, gutter joints are a long way from the street, and a slow drip can stain and soak the stone for a long time before it’s spotted. In Mountcastle, access needs planning, and work on shared parts may need the other owners’ agreement.
Big or small, it’s backed by our one-year guarantee.
- Location
- Mountcastle (EH15, EH8, EH7)
- Region
- Edinburgh
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
Honest limits
Before booking, it’s worth knowing the limits too:
- Rising or penetrating damp from elsewhere in the wall
- Cutting new joints into brickwork, which is building work rather than sealant work
- Failed render or damaged cladding panels
If in doubt, email us at info@mrmastic.co.uk and we’ll say what we think before you book.
Joints and surfaces we work on
- Concrete & block
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Brickwork movement joints
Landlord and commercial work in Mountcastle
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
What affects the cost of external mastic
There’s no set price list. The quote depends on:
- The type of sealant required
- How many areas need sealing
- Whether the work is at height
- Whether there’s mould to deal with
Doing several joints on one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- If someone has resealed it before
- What the problem is, such as mould, gaps, leaks or cracking
- If it’s domestic, commercial or a hotel
- Where the property is
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, email us at info@mrmastic.co.uk.
Different surfaces, different methods
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
Cladding and façade panels
If the façade has a specified sealant, that’s what we use or an approved alternative. Tell us what the building has when you get in touch.
External mastic in Mountcastle: local notes
Mountcastle is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. 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.
Rented homes near Brunstane station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. If you live in an older home near Willowbrae Parish Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Mountcastle is about 3 miles east of Edinburgh, in Edinburgh. Every kind of property in Mountcastle can book us for external mastic. The work is guaranteed for a year. Mountcastle is one of 175 places in Edinburgh we cover for external mastic.
Every address in EH15, EH8 and EH7 is within our area for external mastic, from the main roads to the quietest streets. Whether your property is on Goff Avenue, Bryce Avenue and Durham Avenue or a nearby road, our applicators can take on the job. Being close to the A1 and A1140, Mountcastle is simple for us to get to for external mastic. Nearby, we also carry out external mastic in Northfield (1 mile south-west), Craigentinny (1 mile north), Piershill (1 mile north-west), South Portobello (1 mile east) and Willowbrae (1 mile west). We also work in nearby towns such as Edinburgh (3 miles west), Silvermills (3 miles west), West End (3 miles west), Stockbridge (3 miles west), Canonmills (3 miles west) and West Coates (4 miles west).
Local landmarks in Mountcastle
Locally, jobs take us to homes and businesses close to Public House, Abercorn Park and Duddingston Kirk and the streets around them. Mountcastle’s nearest station is Brunstane station, about 1.4 miles south-east. Well-known places in the area include Cameron Toll Shopping Centre (2.1 miles south-west) and Hibernian Football Club Museum (1.5 miles north-west). Open spaces near Mountcastle include Whinny Hill and The New Leaf Co-op.
Common problems we fix in Mountcastle
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
People normally contact us when they notice something like this:
- Damp patches traced to an open external joint
- Panel joints letting water in
- Weathered mastic that no longer stretches
- Failed seals between different materials
If you look after a building such as Portobello High School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- Whether the sealant suits the joint
- What preparation is included
- Is VAT in the price?
- What guarantee comes with the work
What we do, step by step
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 a few hours to a few days, depending on the length of joint and the access. Parking in city streets around Mountcastle can be tight or controlled, so it helps to know about permits or nearby bays. If you’re in a flat, let us know how we get in at the street door.
- 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.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- For business premises, tell us about site rules or sign-in
- Mention if the joints have been sealed before
- Tell us if parking is tricky
How to get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Read more
Why it’s worth doing now in Mountcastle
Pointing a movement joint with mortar might seem a neat fix, 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 Scottish city tenement, failed sealant affects more than one flat: a leak can come through the ceiling below, and gaps in shared walls or fire-rated joints matter to every flat.
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
What you get with us
- One-year guarantee on every job
- Anti-fungal sanitary silicone in wet areas
- We never seal over old sealant
- White, clear, grey or coloured to suit, where the product allows
Take a look at our cost guide and our reviews.