Na h-Eileanan Siar · Scotland
External Mastic in Lacasaidh
External mastic in Lacasaidh from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Old sealant gone brittle and cracked
- Movement joints filled with mortar instead of sealant
- Sealant that has lost its bond to the brick or render
External mastic in Lacasaidh, done properly
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant. Typical jobs include sealant pulling away from one side of the joint and brick movement joints where the sealant has split, across joints between brick and frames, concrete & block and render & cladding joints.
Older stone buildings need a sealant that suits the stone, not an acetoxy product that can mark or attack it. Newer houses need their movement joints and roofline trims kept sound.
Our work is backed for twelve months.
- Location
- Lacasaidh (HS2)
- Wider area
- Na h-Eileanan Siar
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
How to look after the new joints
After the cure time, these simple habits help:
- Fix overflowing gutters above sealed joints
- Get split or bare joints resealed while the damage is small
- Keep soil, plants and ivy away from the joints
- Point out the joints to other trades
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage.
Can I do it myself?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Why act early in Lacasaidh
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together and it means sorting access once. When the nearest tradesperson is a drive away, it’s tempting to leave a small leak, but water behind a failed seal does the most damage when nobody’s watching.
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.
Why book with us
- Anti-fungal silicone where joints get wet
- Experience in homes, commercial sites and hotels
- We agree the colour with you first
- Sealant colour chosen to suit
See our cost guide or customer reviews.
Questions from Lacasaidh
Is Lacasaidh in your area for external mastic?
Yes, Lacasaidh is within the area we cover. Our work covers the whole of Scotland. You can email us at info@mrmastic.co.uk and let us know what needs doing, and we’ll give you a clear quote.
Is external mastic in a coastal place like Lacasaidh any different?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Is it OK to fill a movement joint with cement?
No. Rigid materials cannot move with the wall, so the joint stops doing its job. If it has already been filled, we can generally cut it out and reseal it.
When is the sealant fully cured?
Cure times vary by product. We tell you how long to leave it before we go.
What does external mastic cost?
It depends on the job, so we quote each one individually. For a quick quote, email us at info@mrmastic.co.uk with a short description of the job.
What colours does the sealant come in?
The sealant colour is picked to suit the wall, so the joint sits quietly in the wall. Exterior sealants come in a good range of colours.
Is it messy?
Tidy work is part of the job. We protect what’s around the joints, and we clear up when we are done.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages.
Places near Lacasaidh
Also in Lacasaidh
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Quotes for external mastic in Lacasaidh
We do not publish a price list, because jobs vary so much. What we look at:
- Access and height
- The size of the job
- The number of rooms or windows
- Working hours on commercial sites
What you pay reflects the work, not guesswork. That’s why we ask about the job first.
Helping us quote
To make quoting easier, let us know:
- Whether it’s a home or a business
- Where the property is
- Access, such as stairs, a lift or height
- What the problem is, such as mould, gaps, leaks or cracking
To get a quote, email us at info@mrmastic.co.uk with the location and a short description of the problem. You’ll have a clear quote before work begins.
How it works
We keep the work tidy and contained to the joints we are treating, so you can carry on as normal. Expect the work to take anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. Somewhere like Lacasaidh may be a longer drive, and the journey is planned ahead. Mention tracks, gates, ferries or anything else about the route.
- We start by walking round the building and agreeing the joints and the access.
- 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.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- Clear the area around the work
- Mention if the joints have been sealed before
Get a quote
Every job is quoted individually. Simply email us at info@mrmastic.co.uk and describe the job.
Related advice
What external mastic looks like in Lacasaidh
Lacasaidh is close to 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.
Around Lacasaidh, as everywhere, external mastic is only as good as the preparation behind it. Homes close to Kinloch Church include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Lacasaidh is in Na h-Eileanan Siar. Our applicators cover external mastic for homes and businesses in Lacasaidh. Lacasaidh is one of 87 places in Na h-Eileanan Siar we cover for external mastic.
Here we cover the HS2 postcode area for external mastic. Nearby, we also carry out external mastic in Baile Ailein (3 miles west), Liurbost (3 miles north-east), North Lochs (4 miles north-east), Crosbost (4 miles north-east) and Marybank (9 miles north-east). If you are somewhere remote, a little more planning is needed.
Around Lacasaidh
Nearby you’ll also find Ravenspoint Centre Museum (1 mile south-east). The countryside around Lacasaidh includes Nisreaval and Loch na Craoibhe.
What the job involves on each surface
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. Priming is done where the sealant calls for it.
Concrete and blockwork
The face of concrete or block is often dusty, so preparation is key. A primer goes on where the product requires one.