Falkirk · Scotland
Window Mastic in Larbert
Window mastic for Larbert and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Gaps left after new windows were fitted
- Draughty joints inside around the window
- Draughts coming in around windows and doors
How we handle window mastic in Larbert
Most frames have an outside joint and an inside one. Outside, the mastic keeps rain out; the internal joint closes the gap to the plaster and stops draughts. Either or both can be done. If you have old mastic that has gone black or come away and white mastic on grey or black frames, we can help.
Many older Scottish homes still have timber windows set into stone walls. The sealant has to suit the stone, which rules out acetoxy silicones that can mark or attack it.
Your job is guaranteed for a year, as with all our work.
- Where
- Larbert (FK5, FK2)
- Wider area
- Falkirk
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Keeping the joints in good condition
How long the joints last depends on use and care. We suggest:
- Wipe condensation off the frames
- Paint up to the joint, not over it
- Keep jet washers away from the mastic
- Avoid harsh chemicals near the mastic
On timber frames, keep the paintwork in good order, because bare, wet timber moves more and pulls at the joint. Paint up to the joint, not over the silicone.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
Larbert homes and the weather
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. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that.
If you look after a building such as Kinnaird Primary School, larger buildings have plenty of frames, and the mastic around each one ages. If you live in an older home near Tryst Church and Hall, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Larbert is about 2 miles north-west of Falkirk, in Falkirk. We carry out window mastic for homes and businesses in Larbert. 50 places in Falkirk are on our list. There’s also a page for Glasgow, roughly 21 miles from Larbert.
All of FK5 and FK2 is within our area for window mastic. You will find streets such as Main Street, Marion Wilson View and Muirhall Road. Main roads around Larbert include the B905. We also cover the places around Larbert: Stenhousemuir (1 mile east), Torwood (2 miles north-west), Camelon (2 miles south), Bonnybridge (3 miles south-west) and Plean (3 miles north-west). Further out, we also cover Grangemouth (4 miles east), Bo'ness (9 miles east), Denny (3 miles west), Polmont (5 miles south-east), Brightons (5 miles south-east) and Kinneil (8 miles east). Larbert is among the bigger towns we cover in Falkirk.
Local landmarks in Larbert
Typical jobs here are in homes near Falkirk High School, among other places. Larbert has its own railway station: Larbert station. Other landmarks nearby include Royal Scottish National Hospital (under half a mile north-west) and Callendar House (3.3 miles south-east). Open spaces near Larbert include Callendar Lake.
What happens on the day
When we get to you, we check the joints match what you told us. 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. In smaller Scottish places, parking is generally less of an issue than access and distance. Let us know how to find you and how to reach the joints.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Mention any sign-in or site rules at work premises
- Move anything stored near the joints
Ask for a quote
Need a quote? Please drop us a line at info@mrmastic.co.uk and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
Also near Larbert
Other services in Larbert
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.
Why deal with it now?
A cracked joint around a frame lets rain into the wall. Over time that can mean damp patches, damaged plaster and rotting timber. Resealing now is a small job by comparison. In a place like Larbert, small leaks are easy to put off, but water through a failed joint keeps working away until it’s fixed.
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Why Larbert clients choose us
- Every job guaranteed for a year
- We agree the colour with you first
- Over 20 years’ experience
- 4.9 on Google from 180+ five-star reviews
Read what affects the cost and customer reviews.
Common problems we fix in Larbert
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and timber moves with moisture as well as temperature.
The problems people generally mention when they call include:
- Cracked internal joints between frame and plaster
- Damp patches on the reveal after heavy rain
- Mastic that is falling out in pieces
- Gaps where the sill meets the wall
If you let a flat or house near Larbert station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Comparing quotes
- How the joint is cleaned and prepared
- The length of the guarantee
- What happens if the job turns out different
- What the cure time is
Questions from Larbert
I let a flat near Larbert station. Can you help?
Yes, we work for landlords and agents. Just send an email to info@mrmastic.co.uk and tell us about the property, and we will give you a clear price.
Do you cover smaller places like Larbert?
Yes, smaller places are covered as well as towns. We work across all of Scotland. Just mention lanes, gates or anything else about the route when you book.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we are using and why.
Where do you work from?
Mr Mastic is based in Crawley. We cover Larbert and the rest of Falkirk, along with the rest of our area.
Can you seal the gap between the frame and the plaster indoors?
Yes. Draughts often come through the inside gap too, so it can be worth sealing both.
How long before the joint can be used?
That depends on the sealant used, so follow the cure time we give you.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few photos.
Do the sealants smell?
There can be a smell while the sealant cures, but it fades. Opening a window helps.
What the job involves on each surface
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
Patio & French doors
Heavy door frames can move more than windows. A flexible sealant copes with that without cracking.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.