Kent · England
Sand mastic for sash & case windows in Fosten Green, Kent
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Fosten Green and across Kent. Fully insured, ARBOMaster approved and guaranteed for a year.
- Old sand mastic that has cracked, crumbled or fallen out
- Modern sealant on a period surround
- Cement or filler used on old window joints that has cracked
Aftercare tips
After the cure time, these simple habits help:
- Have rotten timber repaired before new mastic goes in
- Ask the planning authority about consent for listed or conservation-area homes
- Check the mastic when you check the paintwork
- Plan mastic work ahead of painting
Do not touch or press the mastic while it hardens. It forms a skin fairly soon but needs longer to fully harden.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens.
Sand mastic in Fosten Green, done properly
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. We work on tenement windows, stone surrounds and period & listed homes, and common reasons people get in touch are mastic round period door frames that has failed and crumbling sand mastic round a window.
Somewhere as small as Fosten Green, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
You’re covered for a year from the day we finish. If anything isn’t right with it, call 0345 464 0079 or email us.
- Place
- Fosten Green (TN27)
- Wider area
- Kent
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How the job changes by surface
Sash and case windows
On a sash window, the mastic joint shows on the outside so we finish it carefully.
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We can do one window or several.
Fosten Green: your questions answered
Will you come out to Fosten Green?
Yes, Fosten Green is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
I let a flat near Headcorn station. Can you help?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Should I check with the council before work on a listed or conservation-area home?
Speak to your local planning authority before work starts. Sand mastic is often favoured as like for like but the decision is theirs.
Are you fully insured?
Yes. Full insurance covers our work.
Is the work guaranteed?
All our work has a 12-month guarantee.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us and we are fully insured.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Do I have to be there?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Leave it or put it right?
Cement-based fillers and modern sealants don’t always suit a period surround. Sand mastic matches what was there and that can be important for listed homes. Older cottages and farmhouses around Fosten Green can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, call 0345 464 0079 or email us and we will give you an honest view and a quote.
Why choose Mr Mastic in Fosten Green
- An ARBOMaster approved applicator
- One-year guarantee on every job
- Homes, businesses and hotels
- Any old sealant cut out fully, not covered over
Take a look at our cost guide and what customers say.
How it works
On the day, we look over the joints with you first, so you know exactly what we are doing. Surfaces next to the work are protected before any work begins. The work usually takes a few hours for a single window, longer for several. Somewhere as small as Fosten Green, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Getting ready for the visit
- Tell us if parking is tricky
- Where the joints are inside, avoid wetting them before we arrive
- Mention if the joints have been sealed before
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Related advice
Also near Fosten Green
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Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
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 does not work out, we can still put it right.
Windows and doors in Fosten Green
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Letting a property close to Headcorn station? Then older sash windows in a rental need their mastic kept sound to keep the weather out. In the older streets around St Margaret's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Fosten Green is about 11 miles west of Ashford, in Kent. Anywhere in TN27, we can carry out sand mastic at your property. Our Kent coverage runs to 922 places, Fosten Green among them. You can also see our page for Crawley, about 35 miles away.
All of TN27 is within our area for sand mastic, from the main roads to the quietest streets. We also cover the places around Fosten Green: Clapper Hill (1 mile east), East End (1 mile south), Parkgate (2 miles south-east), London Beach (3 miles east) and Strood (3 miles south-east). We also work in nearby towns such as Maidstone (12 miles north), Ashford (11 miles east), Kings Hill (15 miles north-west), Foley Park (13 miles north), Paddock Wood (11 miles north-west) and Tenterden (4 miles south-east).
Local landmarks in Fosten Green
For rail, the closest station is Headcorn station, roughly 4.6 miles north of the centre. Nearby you will also find Mervyn Quinlan Museum (0.9 miles south) and Sissinghurst Castle (2.1 miles north-west).
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Crumbling stone or brickwork round the window
- Decayed frames that need repair
- Putty and glazing repairs
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly before you book.
Where we work in Fosten Green
- Brick reveals
- Tenement windows
- Sash and case windows
- Timber door frames
- Stone surrounds
- Period & listed homes
Landlord and commercial work in Fosten Green
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Letting agents and landlords in Fosten Green can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.