Na h-Eileanan Siar · Scotland
Nis Sand Mastic
Problem with your window and door surrounds in Nis? We remove the old material, prepare the joints and seal them properly.
- Gaps where the frame meets the masonry
- Patchy fillers round a sash window
- Mastic dropping out of the joint
What we can’t put right
We won’t take on work that will not last, so here’s what sealant cannot put right:
- Whether work needs listed building consent
- Cracked or broken glass
- Sashes that rattle, stick or will not open
If in doubt, email us at info@mrmastic.co.uk and we’ll say what we think before you book.
Joints and surfaces we work on
- Tenement windows
- Sash and case windows
- Period & listed homes
- Brick reveals
- Stone surrounds
- Timber door frames
Sand mastic for homes and businesses in Nis
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. If you have draughts and rain around sash boxes and mastic worn away on windows facing the weather, we can put it right, whatever the surface.
In and around a place like Nis, homes range from older stone-built cottages to newer houses. Exposed frames and sills take the full force of wind-driven rain.
You get a 12-month guarantee, the same in Nis as everywhere else we work.
- Location
- Nis (HS2)
- Wider area
- Na h-Eileanan Siar
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Keep sills and gutters clear so water drains away
- Ask a joiner to look at soft timber first
- Ask us before painting near the mastic
- Take care around the mastic when scraping paint
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger as more mastic falls out.
Signs you need sand mastic in Nis
Water gets into small cracks in the mastic and loosens it further. Exposed elevations usually fail first.
Look out for these signs:
- Draughts and rain around sash boxes
- Failed mastic on an exposed elevation
- Gaps between timber frames and stone or brick
- A silicone bead on a sash window that spoils the look
Around Nis, as everywhere, sand mastic is only as good as the preparation behind it.
Questions to ask before you book
- Who turns up on the day
- What happens if they find a problem under the old sealant
- The length of the guarantee
- Whether they seal over old material or remove it
Frames and glazing around Nis
Nis is within about 2 miles of 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. The west of Scotland is wetter than the east, which means the mastic around older windows and doors has to cope with a lot of rain.
Managing a site like Lionel School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Nis (Gaelic: Ness) is in Na h-Eileanan Siar. Whether you’re in the middle of Nis or further out, we cover sand mastic for every kind of property. Our Na h-Eileanan Siar coverage runs to 87 places, and Nis is one of them.
Work in HS2 is quoted and booked the same way as anywhere else. We also cover the places around Nis: Ness (1 mile south), Lionel (1 mile north-east), Cross (1 mile west), Lìonal (1 mile north) and Sgiogarstaigh (1 mile east). If you’re somewhere remote, the job takes a little more planning.
Landmarks near Nis
Other landmarks nearby include Ness Heritage Centre (0.5 miles north). Not far away are Loch Langavat.
How it works
On the day, we look over the joints with you first, so you know exactly what we’re doing. We protect the surfaces around the joints before any work begins. Most jobs take a few hours per window, depending on the condition of the joints. Outdoor work around Nis depends on the weather, as sealant needs a dry surface, so an outdoor job can move if the forecast changes. Work indoors isn’t affected.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- 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.
How to prepare
- Mention any tricky access
- Mention if the joints have been sealed before
- Mention any parking rules near the property
Ask for a quote
Want a quote for sand mastic? Please drop us a line at info@mrmastic.co.uk and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
How we quote for sand mastic
Call for a quick quote. What matters most is:
- How much old sealant there is and how hard it is to remove
- How many rooms, windows or areas are involved
- Which sealant suits the joint
- How much there is to do
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What we need to know
To make quoting easier, please include:
- Whether it’s a home or a business
- Any access issues, like height or stairs
- Any previous sealing or DIY work
- What the problem is, such as mould, gaps, leaks or cracking
We quote each job on its own. Simply drop us a line at info@mrmastic.co.uk and describe the job and send photos if you have them.
Different surfaces, different methods
Brick reveals
We rake out the old mastic and pack deep voids before the new mastic goes in.
Timber door frames
Round a period front door, sand mastic gives the right look.
Why it’s worth doing now in Nis
New sash windows are a major, costly change and on a listed home, consent may be needed. Where the frames are in good order, new mastic seals the surround. 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.
Doing several joints on one visit is generally more efficient than separate visits. You will get one clear quote for the whole job.
Why choose Mr Mastic in Nis
- Any old sealant cut out fully, not covered over
- We are fully insured
- 4.9 on Google from 180+ five-star reviews
- Approved under the ARBOMaster scheme
Read what affects the cost or our reviews.
Common questions in Nis
Do you cover smaller places like Nis?
Yes. Nis 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. Just mention lanes, gates or anything else about the route when you book.
Can you do sand mastic in Nis?
Yes. We work across all of Scotland, and Nis is part of that. You can send an email to info@mrmastic.co.uk and tell us what needs doing, and we’ll send you a clear quote.
Is it OK to seal over old sealant?
No, and we never do. 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.
Are you insured?
Yes. Mr Mastic is fully insured, and we have been doing sealant work for more than 20 years.
Which is right for my windows, sand mastic or modern sealant?
We will help you decide. Sand mastic suits many period homes and newer frames suit modern sealant.
Where are you based?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
Should I check with the council before work on a listed or conservation-area home?
It’s best to ask your local planning authority first. Like-for-like sand mastic is often the preferred finish, but they decide.
What exactly is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It combines sand with a linseed-oil-based binder.