Na h-Eileanan Siar · Scotland
External Mastic in Leideag
Movement joints in Leideag need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Plants rooting in failed movement joints
- Movement joints with cracked, split or missing sealant
- Cracked joints where brick meets render or frames
When it isn’t the sealant
We will always be straight with you, so here’s what sealant can’t fix:
- Loose or hollow render, which needs re-rendering
- Damp that isn’t coming from the joint
- Subsidence or other structural problems
If you are not sure, just drop us a line at info@mrmastic.co.uk and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Brickwork movement joints
- Copings & trims
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
- Façade panels
About our external mastic in Leideag
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we’ll confirm what access is needed. Typical jobs include water getting into walls through failed joints and brick movement joints where the sealant has split, on façade panels, brickwork movement joints and copings & trims.
Stone walls need a stone-friendly sealant, as acetoxy products can attack some stone. On newer homes, the movement joints and roofline trims are what need watching.
A one-year guarantee comes as standard, so you’re not left on your own once the job is done.
- Location
- Leideag (HS9)
- Wider area
- Na h-Eileanan Siar
- Guarantee
- 12 months on all our work
- Quote
- A clear price before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Keep movement joints as flexible joints, not mortar
- Do not let climbing plants root in the sealant
- Deal with leaking gutters that soak the joints below
- Leave the joints unpainted unless we’ve said otherwise
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years, so it’s worth resealing at the first signs.
Towns and villages near Leideag
What else we do in Leideag
Signs you need external mastic in Leideag
A lot of failed joints come down to preparation: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
Most people get in touch when they notice something like this:
- Movement joints filled with mortar instead of sealant
- Brick movement joints where the sealant has split
- Failed sealant between panels on a façade
- Joints where the bead has come unstuck
For an older house near a landmark such as Church of our Lady, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Comparing quotes
- Who turns up on the day
- Are they insured?
- How hidden problems are handled
- Whether VAT is included
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
If you manage several properties in or around Leideag, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
Common questions in Leideag
Will you come out to Leideag?
Yes, smaller places are covered as well as towns. Our work covers the whole of Scotland, including the islands, where work is planned around ferry crossings. Let us know about access, parking and anything unusual about getting there when you book.
Does living near the coast affect external mastic in Leideag?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. Walls facing the sea are usually the first to need attention.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Will there be a smell?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Why is there a gap in my brick wall?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking, and it should be sealed with a flexible sealant.
Can new sealant go over the old?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
How do you reach high-level joints?
That depends on how high the joints are and the ground below. Low-level joints are straightforward; for higher ones, send details and we’ll confirm the access.
How the visit works
Once we are on site, 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. In smaller Scottish places, parking is usually less of an issue than access and distance. 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.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about parking restrictions
How to get a quote
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. Whenever you are ready, drop us a line at info@mrmastic.co.uk.
Read more
Leave it or put it right?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. 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.
Doing several joints on one visit is normally more efficient than separate visits. You will get one clear quote for the whole job.
Why choose Mr Mastic in Leideag
- Over 20 years’ experience
- Old sealant always removed completely
- We’re fully insured
- Domestic, commercial and hotel work
Walls and rooflines in Leideag
Leideag 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. The west of Scotland is wetter than the east, which means movement joints and outside wall joints has to cope with a lot of rain.
For site and facilities teams at buildings such as Castlebay Community School, larger buildings have long runs of movement joint that eventually need resealing.
Leideag is in Na h-Eileanan Siar. We provide external mastic to householders, landlords and businesses in Leideag, as part of our work across Na h-Eileanan Siar. Leideag is one of 87 places in Na h-Eileanan Siar where we work for external mastic.
Here we cover the HS9 postcode area for external mastic. Whether your property is on Pier Road and The Square or a nearby road, our applicators can take on the job. Other places close to Leideag include Castlebay (1 mile north-west), Bàgh a'Chaisteil (1 mile west), Ceann Tangabhal (1 mile north-west), Brèibhig (1 mile north-east) and Cuidhir (3 miles north). For island and remote addresses, a little more planning is needed, so mention it when you ask for a quote.
Near you in Leideag
A little further out are St Brendan's Hospital (0.6 miles west) and Museum Bharraigh Agus Bhatarsaidh (within half a mile north-west). Green spaces nearby include Ben Leribreck.
What affects the quote in Leideag
Call for a quick quote. What matters most is:
- The size of the job
- Mould in or behind the old joints
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re unsure, email us at info@mrmastic.co.uk for an honest opinion and a quote.
Asking for a quote
You don’t need to know the technical terms. It helps if you can tell us:
- The problem you’ve noticed
- Pictures of the joints, sent by email
- How we’d reach the joints
- The address or postcode of the job
We quote each job on its own. Just email us at info@mrmastic.co.uk with the details.