Dumfries and Galloway · Scotland
Sand mastic for sash & case windows in New Galloway, Dumfries and Galloway
Specialist sand mastic for New Galloway: careful preparation, the right product and tidy work. Call for a quick quote.
- Mastic that needs renewing before redecorating
- Mastic dropping out of the joint
- Cracked mastic round a front door frame
How to look after the new joints
Looking after new joints is easy:
- Have rotten timber repaired before new mastic goes in
- Check with your local planning authority if your home is listed
- Avoid patching sand mastic with silicone
- Avoid heavy scraping on the mastic joint
Avoid painting over the new mastic, which is the traditional advice. Ask us before any decorating around it.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
How we handle sand mastic in New Galloway
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. We are often asked to deal with wind and rain getting in round a sash window and gaps between timber frames and stone or brick, across timber door frames, period & listed homes and brick reveals.
Mastic can only go onto a dry joint, so outside work in New Galloway depends on the weather, and longer journeys are planned in advance. Let us know about access to every frame, including any upstairs.
You are covered for a year from the day we finish. If anything is not right with it, send an email to info@mrmastic.co.uk.
- Place
- New Galloway (DG7)
- Wider area
- Dumfries and Galloway
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Do you need sand mastic in New Galloway?
Some old mastic was never deep enough. A thin layer does not hold well, which is why we pack deep voids first and get the depth right.
The most common problems we see are:
- Silicone on a period window that looks wrong
- Wind and rain getting in round a sash window
- Failed mastic on an exposed elevation
- Mastic dropping out of the joint
Whether the job is in New Galloway itself or nearby, the right material for each joint matters as much as a neat finish.
Questions to ask before booking
- What happens if the job turns out different
- What the quote includes, VAT included or not
- What insurance they hold
- Which sealant they’ll use, and why
Honest limits
We won’t take on work that will not last, so here’s what sealant cannot put right:
- Sashes that need overhauling
- Putty and glazing repairs
- Damaged stone surrounds
If in doubt, drop us a line at info@mrmastic.co.uk and we’ll say what we think.
Where we work in New Galloway
- Timber door frames
- Sash and case windows
- Brick reveals
- Tenement windows
- Stone surrounds
- Period & listed homes
Should I try it myself first?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly.
What we do, step by step
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the job takes anything from a few hours to a full day, depending on how many windows in most cases. Outdoor work around New Galloway depends on the weather, as sealant needs a dry surface, so external jobs may need to move if the day turns wet. Indoor work goes ahead whatever the weather.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Move anything stored near the joints
- Let us know about earlier repairs to the joints
How to get a quote
To get a quote, email us at info@mrmastic.co.uk and tell us where the job is and what the problem looks like. We will send you a clear quote before any work starts.
Advice
Common questions in New Galloway
Is there a guarantee on sand mastic in New Galloway?
Every job comes with our 12-month guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
Is New Galloway within the area you cover?
Yes, we do. Our work covers the whole of Scotland, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Does someone need to be in?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.
What’s sand mastic made of?
A traditional pointing material made from sand and a linseed-oil-based binder for the joint between timber frames and masonry.
Is it possible to take out silicone and use sand mastic instead?
Yes. We remove the silicone and clean the joint, then point it with sand mastic.
How long will you be here?
As a guide, most jobs take a few hours for a single window, longer for several. Bigger jobs take longer.
How long does sand mastic take to go off?
It forms a skin fairly soon, then hardens over a longer period. The weather and joint depth both affect it.
Can sand mastic be painted?
It’s traditionally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
Landlord and commercial work in New Galloway
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Hotels need rooms back in use, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
Nearby places to New Galloway
Also in New Galloway
New Galloway homes and the weather
Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and failed outside joints work against that. Sash and case windows are common in older Scottish homes, often pointed into the wall with traditional sand mastic.
Around New Galloway, as everywhere, sand mastic is only as good as the preparation behind it.
New Galloway is about 21 miles west of Dumfries, in Dumfries and Galloway. Anywhere in DG7, we cover sand mastic for homes and businesses. New Galloway is one of 138 towns and villages in Dumfries and Galloway where we work. There’s also a page for Glasgow, roughly 54 miles from New Galloway.
Every address in DG7 is covered for sand mastic. Whether your property is on High Street, Kirk Road and Old Edinburgh Road or a nearby road, our applicators can take on the job. New Galloway sits on or near the A712 and A762, so getting to you is simple. Other places close to New Galloway include St John's Town of Dalry (2 miles north), Crossmichael (9 miles south-east), Glenlochar (10 miles south-east), Moniaive (12 miles north-east) and Castle Douglas (12 miles south-east). Further out, we also cover Gatehouse of Fleet (13 miles south), Creetown (15 miles south-west) and Minnigaff (15 miles south-west).
Around New Galloway
Well-known places in the area include Kenmure Castle (0.8 miles south). The countryside around New Galloway includes Little Kenmure Loch.
What the job involves on each surface
Sash and case windows
The mastic round a sash window is on show so we finish it carefully.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.