Highland · Scotland
External Mastic in Mallaig
Specialist external mastic for Mallaig: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Leaking joints around cladding and façade panels
- Old sealant gone brittle and cracked
- Movement joints filled with mortar instead of sealant
Signs you need external mastic in Mallaig
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
These are the problems we are asked about most:
- Rain getting behind render or cladding at a joint
- Weathered mastic that no longer stretches
- Joints with sealant missing in places
- Failed sealant between panels on a façade
Rented homes near Mallaig station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
What your quote should include
- Whether you can choose the colour
- How the surfaces are prepared before sealing
- What happens if they find a problem under the old sealant
- Who does the work, and how experienced they are
External mastic in Mallaig
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We take the old material out and do it properly. If you’re dealing with rain getting behind render or cladding at a joint and cracked joints where brick meets render or frames, we can help.
Across smaller places in Scotland, stone and harled cottages, farm buildings and newer houses often stand exposed to wind and rain. Outside joints on exposed walls work hard.
There’s a 12-month guarantee on every job, large or small.
- Place
- Mallaig (PH41)
- Region
- Highland
- Cover
- A year, on every job
- Price
- A clear price before we start
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Surface by surface
Render joints
Water behind render can lead to blown patches. Resealing the joints early keeps water out.
Copings and trims
A failed coping joint lets water into the top of the wall. Sealing them early saves the wall below.
Walls and rooflines in Mallaig
Mallaig is within about 1 mile 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. Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and failed outside joints work against that.
Schools such as Mallaig High School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For an older house near a landmark such as Roman Catholic Church Of St Patrick, an extension built onto an older house moves differently, and the joint between them takes the strain.
Mallaig (Gaelic: Malaig) is in Highland. Mallaig gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. We cover 253 towns and villages across Highland, large and small.
All of PH41 is covered for external mastic. Local streets include Station Road, East Bay and Lochnevis Terrace, all of which we cover. Other places close to Mallaig include Morar (2 miles south), Glenancross (3 miles south), Ardvasar (5 miles north-west), Armadale (5 miles north-west) and Kilbeg (6 miles north). Remote and island addresses need a little more planning, so please mention your location when you send an email to info@mrmastic.co.uk.
What’s near Mallaig
We work in homes and buildings around The Steam Inn, among other places. Mallaig has its own railway station: Mallaig station. Well-known places in the area include Mallaig Heritage Centre (less than half a mile west). Open spaces near Mallaig include Loch an Nostarie.
How to look after the new joints
A little care helps the new joints last. We recommend:
- Point out the joints to other trades
- Check the sealant is paintable before painting near it
- Keep high-pressure jets off the joints
- Get split or bare joints resealed while the damage is small
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead over time.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Other services in Mallaig
Landlords, agents and businesses in Mallaig
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Your questions about external mastic in Mallaig
Does the coastal weather in Mallaig affect outside sealant?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. It’s worth checking the walls that face the sea first.
Do you work for landlords with property near Mallaig station?
Yes, landlords and agents are among the people we work for. Just email us at info@mrmastic.co.uk with the address and what needs doing, and we will give you a clear quote.
How long does the job take?
A typical job takes anything from a few hours to several days, depending on the building, including the preparation. Your quote will say how long we expect yours to take.
Can you seal joints between render and window frames?
Yes. Different materials move at different rates, so the joint between them must be flexible. The sealant is matched to both sides.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
What does external mastic cost?
Size, access and the old material all affect the cost. Call for a quick quote and we will talk you through it.
What colours does the sealant come in?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so it does not stand out.
Why do you put foam in the joint first?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only so it can flex with the joint.
What affects the quote in Mallaig
The price is agreed before any work begins. It’s based on:
- Any mould that needs treating
- When we can work, for business premises
- The number of rooms or windows
- Whether the work is at height
What you pay reflects the work, not a rough estimate. That’s why we ask about the job first and agree the price before starting.
What we need to know
Before you ask for a quote, have a think about:
- Roughly how big the job is
- Whether it’s a home or a business
- How we’d reach the joints
- A few pictures by email, if you can
Getting a quote is simple: let us know what needs doing and where and its rough size. A few pictures by email make the job easier to understand.
What happens on the day
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. Outdoor work around Mallaig depends on the weather, as sealant needs a dry surface, so an outdoor job can move if the forecast changes. Work indoors isn’t affected.
- 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.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Tell us if parking is tricky
- Let us know if you’ve seen damp or leaks
How to get a quote
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we’ll talk you through the work.