Na h-Eileanan Siar · Scotland
External Mastic in Carloway
We cover Carloway for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Failed seals between different materials
- Weeds or debris growing in open joints
- Joints with sealant missing in places
How we handle external mastic in Carloway
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. We work on copings & trims, render & cladding joints and brickwork movement joints, and people most often call us about movement joints with cracked, split or missing sealant and cracked joints where brick meets render or frames.
Stone walls need a stone-friendly sealant, as acetoxy products can attack some stone. Newer houses need their movement joints and roofline trims kept sound.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Where
- Carloway (HS2)
- Wider area
- Na h-Eileanan Siar
- Guarantee
- One year on every job
- Quote
- A clear price before work begins
- info@mrmastic.co.uk
- Updated
- 26 October 2026
What the job involves on each surface
Copings and trims
Coping and trim joints face rain and sun head on. Each is resealed with a weatherproof, flexible sealant.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. We cut out the old sealant and reseal with a product suited to both surfaces.
Also near Carloway
Also in Carloway
Do you need external mastic in Carloway?
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it cannot stretch and tears as soon as the joint widens.
Keep an eye out for these signs:
- Damp patches traced to an open external joint
- Movement joints with cracked, split or missing sealant
- Moss and dirt in joints with no sealant left
- Weathered mastic that no longer stretches
Around Carloway, as everywhere, external mastic is only as good as the preparation behind it.
Questions to ask before you book
- How long to leave it before use
- The length of the guarantee
- Which colour the sealant will be
- Is the old sealant removed completely?
External mastic in Carloway: local notes
Carloway is within about 2 miles 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.
For jobs in and around Carloway, choosing the right material for each joint is as important as a tidy finish.
Carloway (Gaelic: Càrlabhagh) is in Na h-Eileanan Siar. For external mastic in and around Carloway, it’s easy to get a quote: please drop us a line at info@mrmastic.co.uk. We cover Na h-Eileanan Siar from our Crawley base, Carloway included. Carloway is one of 87 places in Na h-Eileanan Siar where we work for external mastic.
We cover every part of HS2 for external mastic and the streets around it. If you are just outside Carloway, we cover Na Gearrannan (1 mile north-west), Shawbost (4 miles north-east), Breasclete (4 miles south), Bragar (6 miles north-east) and Barabhas (10 miles north-east). 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 Carloway
Other landmarks nearby include Gearannon Blackhouse Village (1.4 miles north-west). For a walk, there’s Loch Langavat.
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
A DIY attempt does not rule out a professional job. We cut it out and start again.
Why act early in Carloway
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. Out of town in Scotland, exposed walls take a lot of weather, 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 give you a clear price before any work starts.
Why book with us
- Full insurance on every job
- Old sealant always removed completely
- Every job guaranteed for a year
- Colour picked to suit the job
Read our cost guide and what customers say.
What affects the cost of external mastic
We quote each job individually. This is what makes a difference:
- How easy the joints are to reach
- Which sealant suits the joint
- The size of the job
- How much old sealant there is and how hard it is to remove
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Asking for a quote
Before you ask for a quote, have a think about:
- The problem you’ve noticed
- Where the job is, and your postcode
- The type of property
- Access, such as stairs, a lift or height
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
What we cannot put right
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Failed render or damaged cladding panels
- Cracking across the wall rather than at a joint
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, email us at info@mrmastic.co.uk and we will say what we think.
Surfaces we seal
- Brickwork movement joints
- Copings & trims
- Façade panels
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
Questions from Carloway
Do you cover smaller places like Carloway?
Yes. Carloway is within the area we cover, which takes in towns, villages and rural addresses. We work across all of Scotland, including the islands, where work is planned around ferry crossings. Just mention lanes, gates or anything else about the route when you book.
Do you cover Carloway for external mastic?
Yes. Our work covers the whole of Scotland, and Carloway is part of that. Just email us at info@mrmastic.co.uk with a few details of the job, and we’ll give you a clear price.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. We will talk through colour options before any work starts.
How long does external mastic last?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. Check them each year and reseal when they split or harden. Our work comes with a 12-month guarantee.
Will the old sealant be removed?
Yes, every time. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us, and we are fully insured.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few photos.
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 tell you what we’re using.
The process
There isn’t much for you to do on the day. Show us the job and we will take it from there. The work itself takes anything from a few hours to several days, depending on the building, including the tidy-up. Around Carloway, distance and access matter more than parking. Let us know how to find you and how to reach the joints.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Clear items away from the joints we’re working on
- Keep pets and children clear of the area while we work
Getting a quote
For a quote, email us at info@mrmastic.co.uk and tell us where the job is and what the problem looks like. You’ll have a clear quote before work begins.