Na h-Eileanan Siar · Scotland
Sand Mastic in Lacasaidh
Professional sand mastic in and around Lacasaidh, with every bit of old sealant taken out first and a one-year guarantee.
- Draughty sash windows at the surround
- Failed mastic on an exposed elevation
- Old sand mastic that has cracked, crumbled or fallen out
Sand mastic in Lacasaidh
For a listed home or one in a conservation area, ask your local planning authority whether consent is needed for work to windows. Like-for-like sand mastic is often the preferred finish. Typical jobs include patchy fillers round a sash window and gaps where the frame meets the masonry, across stone surrounds, tenement windows and timber door frames.
Older stone-built homes in Scotland often have sash and case or timber windows set in stone. Those suit a traditional sand mastic or a neutral-cure sealant, not an acetoxy silicone that can attack some stone.
Our work is backed for twelve months.
- Where
- Lacasaidh (HS2)
- Wider area
- Na h-Eileanan Siar
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Landlord and commercial work in Lacasaidh
Letting agents and landlords in Lacasaidh can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will give you a quote.
What happens on the day
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours per window, depending on the condition of the joints. In smaller Scottish places, parking is generally less of an issue than access and distance. Let us know how to find you and how to reach the joints, and the visit is planned around that.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
How to prepare
- Try not to wet indoor joints just before the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us if parking is tricky
Ask for a quote
There’s no standard price list. Instead, your job gets its own clear quote. To get started, drop us a line at info@mrmastic.co.uk.
Read more
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, 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.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
FAQs for Lacasaidh
Is Lacasaidh within the area you cover?
Yes. Lacasaidh is within the area we cover, which takes in towns, villages and rural addresses. 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.
Is Lacasaidh in your area for sand mastic?
Yes. Our work covers the whole of Scotland, and Lacasaidh is part of that. Just email us at info@mrmastic.co.uk with a few details of the job, and we will send you a clear quote.
Can I paint the new mastic?
The usual advice is to leave sand mastic unpainted. If you are redecorating the window, ask us first and we will advise.
Do you have insurance?
Yes. Full insurance covers our work.
What exactly is sand mastic?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and finished to sit neatly against the masonry.
Is it possible to take out silicone and use sand mastic instead?
Often, yes. Once the silicone is out and the joint prepared we point it with sand mastic.
Do you offer different sealant colours?
In most cases you can choose. We’ll tell you which colours the right product comes in and agree one before any work starts.
Where are you based?
We are based in Crawley, and we work across South East England, London and Scotland.
What happens if it’s left?
If you are redecorating, renew the mastic first. Paint over cracked mastic will not stop the gaps, and the new mastic is traditionally left unpainted. Exposed walls in smaller Scottish places take a lot of wind and rain, and once water gets behind a failed joint, damp in stone or harled walls is slow to dry out.
The cost depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before work begins, so you know where you stand.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- Neat joints and a tidy finish
- Every job guaranteed for a year
- Anti-fungal sanitary silicone in wet areas
Read what affects the cost and customer reviews.
Looking after it afterwards
After the cure time, these simple habits help:
- Ask us before painting near the mastic
- Get any rot dealt with first
- Avoid heavy scraping on the mastic joint
- Avoid patching sand mastic with silicone
Avoid painting over the new mastic, as traditional guidance advises. If you’re redecorating, ask us first.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.
What we’re called out for in Lacasaidh
Sand mastic slowly weathers. It hardens, cracks and starts to come away from the frame or the masonry.
These are the problems we’re asked about most:
- Cracked mastic round a front door frame
- Modern sealant on a period surround
- Gaps where the frame meets the masonry
- Mastic dropping out of the joint
For an older house near a landmark such as Kinloch Church, the joint between an old wall and a newer frame is normally the first place rain gets in.
What to look for in a quote
- Whether they seal over old material or remove it
- What the quote includes, VAT included or not
- What guarantee comes with the work
- Which sealant they’ll use, and why
Places near Lacasaidh
What else we do in Lacasaidh
Lacasaidh homes and the weather
Lacasaidh 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. That is hard on the mastic around older windows and doors, especially on the side facing the sea. On the islands, wind and salt spray are hard on outside sealant.
Around Lacasaidh, as everywhere, sand mastic is only as good as the preparation behind it.
Lacasaidh is in Na h-Eileanan Siar. We carry out sand mastic for householders, landlords and businesses in Lacasaidh and the surrounding area, as part of our work across Na h-Eileanan Siar. Our Na h-Eileanan Siar coverage runs to 87 places, Lacasaidh among them.
Jobs for sand mastic in HS2 is quoted and booked the same way as anywhere else. Close by, we work 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). Island and remote addresses take a little more planning, so please mention your location when you send an email to info@mrmastic.co.uk.
Near you in Lacasaidh
Other landmarks nearby include Ravenspoint Centre Museum (1 mile south-east). The countryside around Lacasaidh includes Nisreaval and Loch na Craoibhe.
Different surfaces, different methods
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.