Kent · England
Sand mastic for sash & case windows in River, Kent
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for River, backed by a 12-month guarantee. Call for a quick quote.
- Mastic dropping out of the joint
- Gaps between timber frames and stone or brick
- Modern sealant on a period surround
Sand mastic in River, done properly
We renew sand mastic around sash windows and doors set in stone or brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. We work on brick reveals, period & listed homes and sash and case windows, and common reasons people get in touch are mastic worn away on windows facing the weather and tired mastic found when preparing windows for paint.
Many houses in smaller places like River have conservatories, garden rooms or patio doors. Their glazing joints and frame seals are as much a part of the job as the windows, and any older timber or sash windows need a sealant that suits them.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- River (CT17, CT16)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Sand mastic in River: local notes
River is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to Church of St Peter include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you let a flat or house near Kearsney station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
River is about 1 mile north-west of Dover, in Kent. Across the CT17 area, we cover sand mastic for homes and businesses. River is one of 922 places in Kent where we work. Chelmsford is on our list too, about 53 miles from River.
Here we cover the CT17 and CT16 postcode area for sand mastic. If you need sand mastic at a property on Lower Road, Minnis Lane and London Road or anywhere close by, our applicators can take on the job. Other places close to River include Kearsney (1 mile north-west), Temple Ewell (1 mile north-west), Dover (1 mile south-east), Whitfield (1 mile north-east) and Maxton (2 miles south). Further out, we also cover Canterbury (13 miles north-west), Folkestone (6 miles south-west), Ramsgate (15 miles north-east), Deal (7 miles north-east), Hythe (10 miles south-west) and Walmer (7 miles north-east).
What’s near River
Typical jobs here are in homes near St Edmund's Catholic School, Old Park Hill and Royal Oak Cottage The Royal Oak Public House, among other places. The closest station to River is Kearsney station, roughly 0.5 miles north-west of the centre. Nearby you’ll also find Crabble Corn Mill (less than half a mile south-east) and Dover Castle (2.2 miles south-east). Open spaces near River include Dover Western Heights.
More services for River
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Do you need sand mastic in River?
Rain on the window surround works into any crack and pushes it out. Windows facing the weather tend to go first.
These are the problems we are asked about most:
- Cracked mastic round a front door frame
- Silicone on a period window that looks wrong
- Crumbling sand mastic round a window
- Draughts and rain around sash boxes
If you look after a building such as River Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before booking
- How the surfaces are prepared before sealing
- Is the old sealant removed completely?
- Which colour the sealant will be
- Whether VAT is included
The process
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to a full day, depending on how many windows. For a job in River, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- First we agree which joints need doing.
- 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.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Tell us if parking is tricky
- On commercial sites, let us know about site rules
- Move anything stored near the joints
How to get a quote
We don’t publish a price list. Instead, we give you a clear quote for your job. To get started, ring 0345 464 0079 or send us an email.
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What the job involves on each surface
Timber door frames
Door frames get knocked and soaked and the mastic can crack early. We rake it out and renew it.
Sash and case windows
The mastic round a sash window is on show so we finish it carefully.
For landlords and businesses
Landlords and agents in River can book us as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
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.
When something else is needed
To be straight with you, there are a few things sealant won’t fix:
- Decisions on consent for listed homes
- Sashes that rattle, stick or will not open
- Masonry that needs repairing
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Joints and surfaces we work on
- Brick reveals
- Timber door frames
- Sash and case windows
- Tenement windows
- Stone surrounds
- Period & listed homes
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Inspect the joints round the windows every year or so
- Have rotten timber repaired before new mastic goes in
- Ask us before painting near the mastic
- Avoid heavy scraping on the mastic joint
Do not touch or press the mastic while it hardens. It forms a skin fairly soon, but takes longer to harden fully.
Sound mastic protects the frame. Failed mastic lets water reach the timber and timber that stays wet can rot.
River: your questions answered
Will you come out to River?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you work for landlords with property near Kearsney station?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Can I choose the sealant colour?
We help you choose a colour that suits. The choice depends on the product the joint needs.
Can you do several jobs on one visit?
Yes, we can. More than one area can be quoted together.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
What do you need from me for a quote?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply phone 0345 464 0079 or email us.
Do I need permission for sand mastic on a listed building?
Yes, it’s worth checking. Ask your local planning authority whether consent is needed for work on a listed home or in a conservation area.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we’re using.