West Dunbartonshire · Scotland
Sand Mastic in Arrochar
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Arrochar and across West Dunbartonshire. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Wind and rain getting in round a sash window
- Mastic that needs renewing before redecorating
- Failed mastic on an exposed elevation
What we do, step by step
All our tools and materials come with us in the van, so there’s nothing for you to buy. Once we’ve agreed what’s being done, the area is protected and the work begins. Most jobs take a few hours per window, depending on the condition of the joints. Outside jobs in Arrochar need a dry day, because sealant will not bond to a wet joint, so an outdoor job can move if the forecast changes. Indoor work goes ahead whatever the weather.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
How to prepare
- Mention any tricky access
- Mention any sign-in or site rules at work premises
- Tell us if parking is tricky
Ask for a quote
Asking for a quote is easy: tell us what needs doing and where. Photos by email help us understand the job, and we’ll come back to you with a quote.
Advice
How we handle sand mastic in Arrochar
We work across Arrochar renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand, finished to suit the masonry. We are often asked to deal with mastic that needs renewing before redecorating and weathered mastic on the most exposed windows, on timber door frames, sash and case windows and period & listed homes.
Across smaller places in Scotland, homes range from stone and harled cottages to newer houses, many standing in the open. Exposed frames and sills take the full force of wind-driven rain, so the mastic there works hard.
Each job carries a 12-month guarantee.
- Location
- Arrochar (G83)
- Wider area
- West Dunbartonshire
- Cover
- A year, on every job
- Quote
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
What affects the quote in Arrochar
Some jobs are bigger than they look, and some smaller. The main factors:
- The size of the job
- Whether there’s mould to deal with
- The type of sealant required
- How many rooms, windows or areas are involved
Combining jobs into one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Helping us quote
Before you ask for a quote, have a think about:
- How many joints, rooms or windows are involved
- Any access issues, like height or stairs
- Where the property is
- Whether it has been sealed before
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, email us at info@mrmastic.co.uk.
Surface by surface
Brick reveals
Sand mastic is also used where timber frames meet brick. It gives a traditional finish.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.
What happens if it’s left?
Gaps round a sash window let in rain and draughts. Left, water can reach the timber and the wall so renewing it early protects the window. In a place like Arrochar, small leaks are easy to put off, but water behind a failed seal does the most damage when nobody’s watching.
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote.
Why Arrochar clients choose us
- More than 20 years in sealant work
- Old sealant always removed completely
- Homes, businesses and hotels
- Trusted Arbo and Everbuild sealants
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Renew mastic before redecorating the windows
- Ask the planning authority about consent for listed or conservation-area homes
- Ask a joiner to look at soft timber first
- Clear gutters so water does not pour onto the windows
Don’t touch or press the mastic while it hardens. It forms a skin fairly soon, but takes longer to harden fully.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
For landlords and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
We also work for property managers and facilities teams. Several sites can go on one quote, and we are fully insured.
Places near Arrochar
Other services in Arrochar
Arrochar: your questions answered
Is sand mastic in a coastal place like Arrochar any different?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Can you help a landlord with a rental near Arrochar & Tarbet station?
Yes. We work for landlords and letting agents as well as householders. Just send an email to info@mrmastic.co.uk with the address and what needs doing, and we will give you a clear quote.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Do you work in Arrochar?
Yes. We’re based in Crawley and work across South East England, London and Scotland.
Do you work for hotels and businesses?
Yes. We can plan bigger jobs in stages.
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.
How long does the job take?
As a guide, most jobs take a few hours for a single window, longer for several. Bigger jobs take longer, and we will tell you how long to expect.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Arrochar and the rest of West Dunbartonshire, along with the rest of our area.
Sand mastic in Arrochar: local notes
Arrochar 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’s hard on the mastic around older windows and doors, especially on the side facing the sea. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and sound outside sealant is part of that.
Homes close to Arrochar Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Rented homes near Arrochar & Tarbet station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Arrochar (Gaelic: An t-Àrchar) is about 13 miles north of Helensburgh, in West Dunbartonshire. From the centre of Arrochar to the outskirts, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. We cover 31 towns and villages across West Dunbartonshire, large and small. Glasgow is on our list too, around 30 miles away.
Work in G83 is quoted and booked the same way as anywhere else. If you need sand mastic at a property on Church Road, Beechwood and Macfarlane Drive or a nearby road, our applicators can take on the job. We also cover the places around Arrochar: Succoth (1 mile north), Tarbet (1 mile north-east), An Tairbeart (2 miles north-east), Lochgoilhead (6 miles west) and Ardlui (7 miles north). Larger places within reach include Alexandria (15 miles south-east), Balloch (15 miles south-east) and Jamestown (15 miles south-east).
Landmarks near Arrochar
The nearest railway station is Arrochar & Tarbet station, about 1 mile north-east of the centre. Other landmarks nearby include Inveruglas Isle Castle (3.9 miles north). Not far away are Loch Lomond.
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.