Kent · England
Forstal Sand Mastic
Specialist sand mastic for Forstal: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- A silicone bead on a sash window that spoils the look
- Gaps round a timber door in stone or brick
- Mastic dropping out of the joint
Why act early in Forstal
Draughts round a sash window are not always the sashes. Gaps between the frame and the wall can be just as bad and new mastic seals them. Where a wall is exposed, as many are in small places like Forstal, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why us?
- Anti-fungal silicone where joints get wet
- Approved under the ARBOMaster scheme
- Old sealant always removed completely
- Full insurance on every job
See our cost guide and our reviews.
Sand mastic in Forstal, done properly
If your home is listed or in a conservation area, check with your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. If you are dealing with open joints round the window box and tired mastic found when preparing windows for paint, we can help, on stone surrounds, sash and case windows and timber door frames alike.
Somewhere as small as Forstal, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
Whatever the size of the job, you get the same one-year guarantee in Forstal and across Kent.
- Location
- Forstal (ME20)
- Region
- Kent
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Surface by surface
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It suits older brickwork.
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We can do one window or several.
Landlords, agents and businesses in Forstal
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
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.
Common questions in Forstal
Do you cover Forstal for sand mastic?
Yes, Forstal is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we will give you a clear quote.
I let a flat near Aylesford station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
How do I get a quote for sand mastic in Forstal?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before work begins.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Is it possible to take out silicone and use sand mastic instead?
Yes, it’s a common request. The old silicone has to come out completely so the mastic can sit properly.
How the visit works
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. It normally takes anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Forstal, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Keep children and pets away from the work area
- Clear the area around the work
Get a quote
Asking for a quote is easy: tell us what needs doing and where. A few pictures by email make the job easier to understand, and we will take it from there.
Read more
What we cannot put right
A few problems are outside what sealant work can do:
- Decisions on consent for listed homes
- Sashes that need overhauling
- Broken panes
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
Where we work in Forstal
- Period & listed homes
- Stone surrounds
- Timber door frames
- Tenement windows
- Brick reveals
- Sash and case windows
Also in Forstal
Sand mastic in Forstal: local notes
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Starkey Castle (about 4.4 miles north) nearby, there’s older building stock in the area around Forstal as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
If you live in an older home near Methodist Church Including Sunday School, the joint between an old wall and a newer frame is generally the first place rain gets in. Schools such as St Peter's Church of England Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. For landlords with property near Aylesford station, any sash windows need sound mastic to keep draughts and rain out.
Forstal is about 3 miles north-west of Maidstone, in Kent. Across the ME20 area, we cover sand mastic for homes and businesses. Across Kent, we cover 922 places, Forstal among them. London is on our list too, around 29 miles away.
We work across the ME20 postcode area for sand mastic. We cover properties on Beddow Way and Forstal Road. Nearby, we also carry out sand mastic in Pratling Street (1 mile north-east), Eccles (1 mile north-west), New Hythe (2 miles west), Burham (2 miles north) and Larkfield (2 miles west). Further out, we also cover Maidstone (3 miles south-east), Sittingbourne (11 miles east), Dartford (15 miles north-west), Sevenoaks (13 miles west), Royal Tunbridge Wells (15 miles south-west) and Gravesend (10 miles north-west).
What’s near Forstal
In Forstal, that means homes and buildings near Aylesford School, The Bush pub and Tyland Barn and the streets around them. For rail, the closest station is Aylesford station, about 1.2 miles west of the centre. Nearby you will also find Medway megaliths (1 mile north) and Maidstone Hospital (2 miles south). Not far away are Boxley Hills and Burham Down.
Aftercare tips
After the cure time, these simple habits help:
- Go gently near the mastic when preparing windows
- Renew mastic before redecorating the windows
- Keep modern sealant off the mastic
- Ask the planning authority about consent for listed or conservation-area homes
Don’t run silicone over the new mastic. If anything cracks, get it looked at before trying a quick fix.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.
What affects the quote in Forstal
We quote each job individually. These are the things that affect it:
- Whether there’s mould to deal with
- The amount of work
- Working hours on commercial sites
- Whether the work is at height
Doing several joints on one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. We’ll send you a clear quote for the lot.
What we need to know
You don’t need to know the technical terms. It helps if you can tell us:
- Where the job is, and your postcode
- Any access issues, like height or stairs
- Whether it has been sealed before
- Roughly how big the job is
Want a quote for sand mastic? Please ring 0345 464 0079 or send us an email with a few details. We will explain what we’d do and send you a clear quote before work begins.