Na h-Eileanan Siar · Scotland
Sand Mastic in Carloway
Window and door surrounds in Carloway need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Open joints round the window box
- Cement or filler used on old window joints that has cracked
- Crumbling sand mastic round a window
When to call us in Carloway
Over the years, sand mastic weathers. It dries out, cracks and loses its grip on the stone or timber.
Look out for these signs:
- Silicone on a period window that looks wrong
- Weathered mastic on the most exposed windows
- Draughty sash windows at the surround
- Crumbling sand mastic round a window
Whether the job is in Carloway itself or nearby, the right material for each joint matters as much as a neat finish.
Questions to ask before booking
- Whether they’re fully insured
- Whether all the old sealant comes out first
- How hidden problems are handled
- Whether you can choose the colour
Sand mastic for homes and businesses in Carloway
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant, and we’ll talk through which suits your home. We work on period & listed homes, sash and case windows and stone surrounds, and common reasons people get in touch are gaps where the frame meets the masonry and crumbling sand mastic round a window.
Mastic can only go onto a dry joint, so outside work in Carloway depends on the weather. Tell us about access to all the windows and doors, upstairs included.
Each job carries a 12-month guarantee.
- Where
- Carloway (HS2)
- Region
- Na h-Eileanan Siar
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
Leave it or put it right?
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic suits the building and blends with the stone or brick. In an older home around Carloway, damp from a failed joint can get into timber and plaster.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, drop us a line at info@mrmastic.co.uk for an honest opinion and a quote.
Why book with us
- Over 20 years’ experience
- One-year guarantee on every job
- Homes, businesses and hotels
- Rated 4.9 stars on Google
See what affects the cost and customer reviews.
What we do, step by step
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a single window, longer for several and we leave things clean and tidy. Somewhere like Carloway may be a longer drive, and the journey is planned ahead. Mention tracks, gates, ferries or anything else about the route.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Mention any parking rules near the property
- Plan for the work area to be out of bounds to pets and children
Ask for a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, drop us a line at info@mrmastic.co.uk.
Related advice
Also near Carloway
What else we do in Carloway
Carloway: your questions answered
Can you do sand mastic in Carloway?
Yes, Carloway is within the area we cover. Our work covers the whole of Scotland. You can send an email to info@mrmastic.co.uk and tell us what needs doing.
Will you come out to Carloway?
Yes, Carloway is covered. We work across all of Scotland, islands included, from towns to the smallest places. Longer journeys are simply planned in advance.
How long does sand mastic take to harden?
Not right away. It skins first and hardens fully later and we will give you an idea for your job.
Can you match the sealant colour?
In most cases you can choose. We’ll tell you which colours the right product comes in and agree one before work begins.
I rent my home. Can I book you?
We’re happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
Should I use sand mastic or silicone?
That depends on your windows. On many period windows, sand mastic looks right and suits the building and newer frames normally get a flexible sealant.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Does someone need to be in?
That depends on where the joints are. For work indoors, someone needs to let us in, and for outside work we will agree access with you when we book.
Frames and glazing around Carloway
Carloway is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Island weather, with its wind and salt spray, is tough on the mastic around older windows and doors.
In and around Carloway, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint.
Carloway (Gaelic: Càrlabhagh) is in Na h-Eileanan Siar. Across the HS2 area, our applicators can take on sand mastic. Carloway is one of 87 places in Na h-Eileanan Siar where we work.
Here we cover the HS2 postcode area for sand mastic. Neighbouring places we cover for sand mastic include 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 drop us a line at info@mrmastic.co.uk.
Near you in Carloway
Other landmarks nearby include Gearannon Blackhouse Village (1.4 miles north-west). Not far away are Loch Langavat.
How to look after the new joints
So the new joints stay in good condition:
- Don’t paint over the new mastic
- Have rotten timber repaired before new mastic goes in
- Renew mastic before redecorating the windows
- Check the mastic when you check the paintwork
Avoid painting over the new mastic, which is the traditional advice. If you are redecorating, ask us first.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.
What affects the cost of sand mastic
Every job gets its own quote. This is what makes a difference:
- Access and height
- Whether there’s mould to deal with
- When we can work, for business premises
- The type of sealant required
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What we need to know
Photos help, but a description is a good start. Please mention:
- Roughly how big the job is
- A few pictures by email, if you can
- Whether it has been sealed before
- If it’s domestic, commercial or a hotel
We quote each job on its own. Simply drop us a line at info@mrmastic.co.uk and describe the job.
Can I do it myself?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
What we can’t put right
It helps to know what we can’t do:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Decisions on consent for listed homes
- Sash cords, weights and draught-proofing of the sashes
If in doubt, drop us a line at info@mrmastic.co.uk and we’ll say what we think before booking.
Joints and surfaces we work on
- Tenement windows
- Timber door frames
- Sash and case windows
- Stone surrounds
- Period & listed homes
- Brick reveals