Stirling · Scotland
Tyndrum Window Mastic
Window mastic in Tyndrum from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Old mastic that has gone black or come away
- Untidy mastic left by window fitters
- Draughty joints inside around the window
What we are called out for in Tyndrum
Every frame moves through the day. Sun on a frame makes it expand, and it contracts again overnight, while the masonry beside it stays put. A sealant that can’t keep up eventually tears.
Signs it’s time to call us include:
- Draughty joints inside around the window
- Hard, cracked sealant around windows
- Sealant in the wrong colour for the frame
- Cracked sealant at the sill ends
In and around Tyndrum, as anywhere, good window mastic starts with a clean, dry, properly prepared joint.
What your quote should include
- Who turns up on the day
- How long to leave it before use
- What insurance they hold
- Whether the sealant suits the joint
How we handle window mastic in Tyndrum
Colour matters on a frame. White, brown, anthracite grey, black and clear sealants are all available, so the bead blends with the window rather than framing it. If you have mastic that’s falling out in pieces and a bead that doesn’t match the frame, we can put it right, on window sills, aluminium frames and timber windows & doors alike.
Outdoor sealant needs a dry surface, so window work around Tyndrum is planned around the weather, and longer journeys are planned in advance. Tell us about access to all the windows and doors, upstairs included.
We stand behind the work with a 12-month guarantee.
- Location
- Tyndrum (FK20)
- Wider area
- Stirling
- Cover
- One year on every job
- Quote
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
What happens on the day
Once we are on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours for a few frames, or a day or more for a whole house. Outdoor work around Tyndrum 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 frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- We fit backing rod in deep gaps so the sealant is the right depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- We clear up and check every joint is fully closed.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Clear items away from the joints we are working on
- Mention any leaks or damp you’ve noticed
How to get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you are ready, drop us a line at info@mrmastic.co.uk.
Advice
Honest limits
We won’t take on work that will not last, so here’s what sealant cannot put right:
- Draughts through the window seals rather than the frame
- Damp coming through the wall itself rather than the frame joint
- Broken hinges, locks or handles
If in doubt, drop us a line at info@mrmastic.co.uk and we will say what we think before you book.
Where we work in Tyndrum
- Timber windows & doors
- uPVC windows
- Aluminium frames
- Composite doors
- Patio & French doors
- Window sills
Other services in Tyndrum
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.
Tyndrum questions
Do you work for landlords with property near Tyndrum Lower station?
Yes, we work for landlords and agents. You can drop us a line at info@mrmastic.co.uk with the address and a few details, and we’ll give you a fixed price before any work starts.
Do you cover Tyndrum for window mastic?
Yes, Tyndrum is within the area we cover. Our work covers the whole of Scotland. You can drop us a line at info@mrmastic.co.uk and tell us what needs doing.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Tyndrum, along with the rest of our area.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
Do you have insurance?
Yes. We are fully insured.
Do you guarantee window mastic?
Yes. Each job is covered for 12 months.
Keeping the joints in good condition
How long the joints last depends on use and care. We suggest:
- Air rooms to keep condensation down around windows
- Use gentle cleaners on frames and sealant
- Paint up to the joint, not over it
- Keep drainage slots and sill grooves clear
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
Water gets in quietly when mastic fails. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.
What the job involves on each surface
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We will tell you which suits your home.
uPVC windows
uPVC expands and contracts noticeably with temperature, so we use a flexible, low-modulus sealant. We match white, brown, anthracite grey and black frames.
Window mastic in Tyndrum: local notes
The west of Scotland is wetter than the east, which means the mastic around window and door frames has to cope with a lot of rain. Sash and case windows are common in older Scottish homes, and the joint between the box frame and the stone or render is traditionally pointed with sand mastic.
If you let a flat or house near Tyndrum Lower station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Tyndrum is about 30 miles north of Helensburgh, in Stirling. From the centre of Tyndrum to the outskirts, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Tyndrum is one of 55 places in Stirling we cover. There’s also a page for Glasgow, about 44 miles away.
Here we cover the FK20 postcode area for window mastic. Other places close to Tyndrum include Clifton (1 mile north-west), A' Chrìon Làraich (5 miles south-east), Bridge of Orchy (6 miles north), Inverarnan (8 miles south) and Ardlui (10 miles south).
Around Tyndrum
There’s a railway station in Tyndrum itself: Tyndrum Lower station. Open spaces near Tyndrum include Lochan na Bì.
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.