Stirling · Scotland
Sand mastic for sash & case windows in Strathblane, Stirling
Our applicators work in Strathblane on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Old sand mastic that has cracked, crumbled or fallen out
- Silicone on a period window that looks wrong
- Mastic that needs renewing before redecorating
Sand mastic in Strathblane, done properly
We work across Strathblane renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. We work on tenement windows, timber door frames and period & listed homes, and common reasons people get in touch are mastic round period door frames that has failed and old sand mastic that has cracked, crumbled or fallen out.
Many older Scottish homes still have timber windows set into stone walls. Those suit a traditional sand mastic or a neutral-cure sealant, not an acetoxy silicone that can attack some stone.
Our work is backed for twelve months, in Strathblane and everywhere else we cover.
- Location
- Strathblane (G63)
- Region
- Stirling
- Cover
- 12 months on all our work
- Quotes
- A clear price before we start
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Common problems we fix in Strathblane
Shallow joints are a common cause. Mastic that is too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
Common reasons people contact us are:
- Tired mastic found when preparing windows for paint
- Patchy fillers round a sash window
- Gaps between timber frames and stone or brick
- Draughts and rain around sash boxes
For an older house near a landmark such as Parish Church and Churchyard, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Questions to ask before you book
- What product goes in the joint
- Is VAT in the price?
- Who does the work, and how experienced they are
- How the joint is cleaned and prepared
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Check with your local planning authority if your home is listed
- Clear gutters so water does not pour onto the windows
- Check the mastic when you check the paintwork
- Renew mastic before redecorating the windows
Don’t run silicone over the new mastic. If you see a crack, ask us to take a look rather than patching it.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens.
Common questions in Strathblane
I let a flat near Milngavie station. Can you help?
Yes, landlords and agents are among the people we work for. Just send an email to info@mrmastic.co.uk with the address and what needs doing, and we will send you a clear quote.
Do you cover smaller places like Strathblane?
Yes. Strathblane is within the area we cover, which takes in towns, villages and rural addresses. Our work covers the whole of Scotland. Let us know about access, parking and anything unusual about getting there when you book.
Do you have insurance?
Yes. We’re fully insured.
Is it OK to seal over old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
What’s sand mastic made of?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
When will the new mastic be hard?
It takes a while. It skins first and hardens fully later and we’ll give you an idea for your job.
Can you match the sealant colour?
We’ll suggest a colour to suit the surroundings. The choice depends on the product the joint needs.
Should I check with the council before work on a listed or conservation-area home?
Checking first is sensible. Ask your local planning authority whether consent is needed for listed or conservation-area properties.
Should I try it myself first?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Other services in Strathblane
Why act early in Strathblane
Filling over old, loose mastic doesn’t last. We remove the loose material first so the new work lasts. Exposed walls in smaller Scottish places take a lot of wind and rain, and damp in stone or harled walls takes a long time to dry once water gets behind a joint.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why us?
- Sanitary silicone with an anti-fungal additive in wet areas
- 180+ five-star Google reviews
- Any old sealant cut out fully, not covered over
- Over 20 years’ experience
Surface by surface
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.
Stone surrounds
Old stone surrounds are often uneven, so the gap isn’t the same all the way round. We shape it by hand to follow the stone.
Work for landlords, hotels and businesses
We work for landlords and agents as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Windows and doors in Strathblane
Many older homes in Scotland have sash and case windows, and the joint between the box frame and the stone or render is traditionally pointed with sand mastic. Strathblane is in the west of Scotland, which is wetter than the east, so there’s plenty of rain for the mastic around older windows and doors to keep out.
For landlords with property near Milngavie station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Strathblane is about 5 miles north of Bearsden, in Stirling. Wherever you are in the G63 postcode area, our applicators can take on sand mastic. 55 places in Stirling are on our list, from the larger towns to small villages. Glasgow is on our list too, around 9 miles away.
All of G63 is covered for sand mastic. You’ll find streets such as Station Road, Southview Road and Kirkhouse Road, and we cover them all. We also cover the places around Strathblane: Milngavie (3 miles south), Auchenhowie (4 miles south), Bearsden (5 miles south), Faifley (5 miles south-west) and Westerton (6 miles south). Larger places within reach include Killearn (5 miles north-west), Balfron (6 miles north), Kippen (11 miles north-east) and Drymen (8 miles north-west).
Near you in Strathblane
Locally, jobs take us to homes and businesses close to Mugdock Country Park. For rail, the closest station is Milngavie station, roughly 3.2 miles south. A little further out are Killearn Hospital (4.7 miles north-west) and Mugdock Castle (1.6 miles south-west). Open spaces near Strathblane include Dumgoyne and Dumbrock Loch.
The process
Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours per window, depending on the condition of the joints. Outdoor work around Strathblane depends on the weather, as sealant needs a dry surface, 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.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Try not to wet indoor joints just before the visit
- Tell us if parking is tricky
How to get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we will talk you through the work.