Na h-Eileanan Siar · Scotland
Sand mastic for sash & case windows in Crosbost, Na h-Eileanan Siar
We cover Crosbost for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Gaps between timber frames and stone or brick
- Old sand mastic that has cracked, crumbled or fallen out
- Window mastic to renew ahead of painting
Sand mastic in Crosbost, done properly
We work across Crosbost renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand, finished to suit the masonry. Common call-outs are for cracked mastic round a front door frame and mastic that needs renewing before redecorating, on timber door frames, period & listed homes and brick reveals.
Outdoor sealant needs a dry surface, so window work around Crosbost is planned around the weather, and longer journeys are planned in advance. Tell us about access to all the windows and doors, upstairs included.
Whatever the size of the job, you get the same 12-month guarantee.
- Location
- Crosbost (HS2)
- Wider area
- Na h-Eileanan Siar
- Cover
- One year on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
FAQs for Crosbost
Do you cover Crosbost for sand mastic?
Yes. We work across all of Scotland, and Crosbost is part of that. Just drop us a line at info@mrmastic.co.uk with a few details of the job, and we will give you a clear price.
Is Crosbost within the area you cover?
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.
What exactly is sand mastic?
Sand mastic is a traditional material for pointing round windows and doors. It’s made with sand and a linseed-oil-based binder.
Is it OK to seal over old sealant?
No, it will not last. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
Should I check with the council before work on a listed or conservation-area home?
Checking first is sensible. Your local planning authority can say if consent is needed for listed or conservation-area properties.
Do you have insurance?
Yes. We’re fully insured, and we can confirm the details when we quote.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you do not need to watch us work.
Will it make a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Landlords, agents and businesses in Crosbost
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can be quoted together.
What else we do in Crosbost
When to call us in Crosbost
Most of it is simply age. Even well-laid mastic needs renewing in time, depending on exposure and upkeep.
Keep an eye out for any of the following:
- Tired mastic found when preparing windows for paint
- Wind and rain getting in round a sash window
- Cracked mastic round a front door frame
- Gaps between timber frames and stone or brick
For jobs in and around Crosbost, choosing the right material for each joint is as important as a tidy finish.
What to look for in a quote
- How much experience the applicator has
- Is the old sealant removed completely?
- How the colour is chosen
- Whether VAT is included
Surface by surface
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. The gap round it is pointed with sand mastic.
Stone surrounds
Stone surrounds suit sand mastic well. The finish blends with the masonry.
Windows and doors in Crosbost
Crosbost 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 the mastic around older windows and doors, 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 sound outside sealant is part of that.
In and around Crosbost, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint.
Crosbost is in Na h-Eileanan Siar. For sand mastic in and around Crosbost, it’s easy to get a quote: please email us at info@mrmastic.co.uk. We are based in Crawley and cover Na h-Eileanan Siar. Our Na h-Eileanan Siar coverage runs to 87 places, and Crosbost is one of them.
Every address in HS2 is covered for sand mastic, from the main roads to the quietest streets. We also cover North Lochs (1 mile west), Liurbost (1 mile west), Lacasaidh (4 miles south-west), Sandwick (5 miles north-east) and Stornoway (5 miles north). Remote and island addresses need a little more planning, so please mention your location when you drop us a line at info@mrmastic.co.uk.
Around Crosbost
Other landmarks nearby include Western Isles Hospital (5.9 miles north). Not far away are Loch na Craoibhe and Nisreaval.
What we do, step by step
When we arrive, we start by going over the job with you. Surfaces next to the work are protected before any work starts. The work normally takes anything from a few hours to a full day, depending on how many windows. Around Crosbost, distance and access matter more than parking. Let us know how to find you and how to reach the joints, and the visit is planned around that.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Preparing for the visit
- Let us know about parking restrictions
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any water getting in
Get a quote
If you’re in Crosbost and need sand mastic, drop us a line at info@mrmastic.co.uk. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Read more
When something else is needed
We will always be straight with you, so here’s what sealant can’t fix:
- Planning or listed building consent (your local planning authority decides)
- Masonry that needs repairing
- Putty and glazing repairs
Not sure which it is? You can drop us a line at info@mrmastic.co.uk and we’ll tell you honestly.
Surfaces we seal
- Sash and case windows
- Timber door frames
- Brick reveals
- Tenement windows
- Stone surrounds
- Period & listed homes
What affects the cost of sand mastic
Call for a quick quote. The main things that affect it are:
- The number of rooms or windows
- Which sealant suits the joint
- Whether there’s mould to deal with
- The old material and how stubborn it is
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Asking for a quote
What to tell us when you ask for a quote:
- Pictures of the joints, sent by email
- Any access issues, like height or stairs
- The problem you’ve noticed
- The address or postcode of the job
For a quote, drop us a line at info@mrmastic.co.uk and tell us where the job is and what the problem looks like. You will have a clear quote before we start.
Looking after it afterwards
Good habits help new joints last longer. Our tips:
- Ask us before painting near the mastic
- Clear gutters so water does not pour onto the windows
- Get any rot dealt with first
- Do not run silicone over sand mastic
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
An open joint round the box lets weather through. Left, the gap tends to get bigger as more mastic falls out.