Na h-Eileanan Siar · Scotland
External Mastic in Garrabost
External mastic for Garrabost, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Joints where the bead has come unstuck
- Panel joints letting water in
- Weeds or debris growing in open joints
External mastic for homes and businesses in Garrabost
On houses, flats and commercial buildings across Garrabost, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. We work on joints between brick and frames, concrete & block and copings & trims, and people most often call us about sealant that has lost its bond to the brick or render and joints pointed up with cement by mistake.
Outside joints can only be sealed when they’re dry, so work in Garrabost depends on the weather, and longer journeys are planned in advance. Let us know about access to every wall and roofline.
A one-year guarantee comes as standard, so you are covered after we have gone.
- Place
- Garrabost (HS2)
- Wider area
- Na h-Eileanan Siar
- Cover
- A year, on every job
- Price
- A clear price before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
When it isn’t the sealant
New sealant can’t fix everything, and we will tell you before any work starts. Sealant won’t put right:
- Walls that need new movement joints cut into them
- Cracked brickwork or render that needs a builder or plasterer
- Loose or hollow render, which needs re-rendering
If you’re not sure, just drop us a line at info@mrmastic.co.uk and we’ll give you a straight answer before you book.
What we seal
- Concrete & block
- Brickwork movement joints
- Façade panels
- Copings & trims
- Joints between brick and frames
- Render & cladding joints
Also near Garrabost
Other services in Garrabost
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 around the joint, so the damage spreads beyond the joint. Exposed walls in smaller Scottish places take a lot of wind and rain, and damp in stone or harled walls takes a long time to dry once water gets behind a joint.
The cost reflects the work involved, not guesswork. That’s why we ask about the job first and send you a clear quote before work begins.
What you get with us
- Colour agreed with you before work begins
- Any old sealant cut out fully, not covered over
- White, clear, grey or another colour, product permitting
- Neat joints and a tidy finish
Read what affects the cost or our reviews.
FAQs for Garrabost
Do you cover Garrabost for external mastic?
Yes. We work across all of Scotland, and Garrabost is part of that. Just send an email to info@mrmastic.co.uk with a few details of the job, and we will send you a clear quote.
Does the coastal weather in Garrabost affect outside sealant?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Can I add another job to the visit?
Yes. Several rooms, windows or areas can go on one quote.
Why is there a gap in my brick wall?
A vertical gap in a long brick wall is normally a movement joint. It lets the bricks expand without cracking, and it should be sealed with a flexible sealant.
What do you need from me for a quote?
Tell us what needs doing and where, with pictures by email if possible. We’ll ask anything else we need to know.
Do you do commercial work?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
Is the work guaranteed?
Yes, for a year. If anything is not right with the work within the year, let us know and we’ll sort it.
What happens on the day
Once we are on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours for a handful of joints, longer for a whole elevation. For a place like Garrabost, longer drives are planned in advance. Tell us about tracks, gates, a ferry crossing or anything unusual about getting there.
- 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.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Try not to wet indoor joints just before the visit
- Mention any tricky access
Ask for a quote
Want a quote for external mastic? Please send an email to info@mrmastic.co.uk and tell us about the job. We will explain what we’d do and send you a clear quote before work begins.
Related advice
Can I do it myself?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
How the job changes by surface
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joints work hard every day. The sealant is chosen with that in mind.
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Walls and rooflines in Garrabost
Garrabost is close to 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. Island weather, with its wind and salt spray, is tough on movement joints and outside wall joints.
In the older streets around Parish Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Around Garrabost, as everywhere, external mastic is only as good as the preparation behind it.
Garrabost is in Na h-Eileanan Siar. We carry out external mastic for homes and businesses in Garrabost and nearby, as part of our work across Na h-Eileanan Siar. Garrabost is one of 87 places in Na h-Eileanan Siar we cover.
Every address in HS2 is covered for external mastic. You will find streets such as Graham Avenue and Claypark Road. Neighbouring places we cover for external mastic include Pabail Uarach (1 mile south-east), Sulaisiadar (1 mile north-east), Lower Bayble (1 mile south), Knock (2 miles south-west) and Na h-Eileanan an Iar (2 miles south-west). Island and remote addresses take a little more planning, so please mention your location when you email us at info@mrmastic.co.uk.
Local landmarks in Garrabost
Other landmarks nearby include Western Isles Hospital (5.7 miles west). Not far away are Loch an Tiumpan.
What affects the cost of external mastic
There’s no set price list, because no two jobs are the same. The quote depends on:
- When we can work, for business premises
- The number of rooms or windows
- The size of the job
- Which sealant suits the joint
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Helping us quote
When you contact us, it’s useful to know:
- Roughly how big the job is
- Where the property is
- How we’d reach the joints
- Whether it has been sealed before
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. Whenever you’re ready, send an email to info@mrmastic.co.uk.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Show decorators and builders where the movement joints are
- Clear growth from the base of walls and joints
- Never let anyone fill a movement joint with mortar
- Leave the joints unpainted unless we have said otherwise
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead.
Act while the splits are small. At that stage it’s a simple cut out and reseal with no damage behind it to deal with.