Kent · England
Dungate Sand Mastic
Sand mastic for Dungate, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Weathered mastic on the most exposed windows
- Modern sealant on a period surround
- Tired mastic found when preparing windows for paint
What the job involves on each surface
Period and listed homes
On a listed home or in a conservation area, the right material matters. Like-for-like sand mastic is usually favoured.
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
Sand mastic in Dungate, done properly
Sand mastic doesn’t last for ever and gaps open up round the frame. We rake it out and renew it so the surround looks right again. We work on timber door frames, sash and case windows and brick reveals, and the jobs we see most are crumbling sand mastic round a window and window mastic to renew ahead of painting.
Outdoor sealant needs dry, clean surfaces, so work on frames around Dungate is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Place
- Dungate (ME9)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Ask us before painting near the mastic
- Go gently near the mastic when preparing windows
- Keep sills and gutters clear so water drains away
- Have rotten timber repaired before new mastic goes in
Avoid painting over the new mastic, as traditional guidance advises. If you’re redecorating, ask us first.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall so early renewal protects both.
The process
There’s no need to move everything out, just the space around the work. Everything nearby is protected, and the job takes a few hours per window, depending on the condition of the joints in most cases. Somewhere as small as Dungate, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
How to prepare
- Try not to wet indoor joints just before the visit
- Let us know about parking restrictions
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
There’s no standard price list. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or email us.
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FAQs for Dungate
Is Dungate in your area for sand mastic?
Yes, Dungate 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 tell us what needs doing, and we will send you a clear quote.
Will you come out to Dungate?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you guarantee sand mastic work?
Our 12-month guarantee applies on every job.
How much does sand mastic cost in Dungate?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Should I try DIY first?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Do I need permission for sand mastic on a listed building?
Checking first is sensible. Ask your local planning authority whether consent is needed for listed or conservation-area properties.
Which products do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we will tell you what we’re using.
Can you seal over the old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Towns and villages near Dungate
What else we do in Dungate
Landlords, agents and businesses in Dungate
In hotels, rooms out of use cost money, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
We work for landlords and letting agents as well as homeowners. Sealant work between tenants keeps a property looking cared for.
Can I do it myself?
If you’ve already had a go yourself, that is fine. We cut it out and start again.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Common problems we fix in Dungate
Timber swells and shrinks with the weather. The movement cracks the mastic little by little.
Look out for any of the following:
- Modern sealant on a period surround
- Mastic round period door frames that has failed
- Failed mastic on an exposed elevation
- Gaps between timber frames and stone or brick
Homes close to Church of St Catherine include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
What to look for in a quote
- How the colour is chosen
- Who turns up on the day
- Is VAT in the price?
- What happens if they find a problem under the old sealant
Why it’s worth doing now in Dungate
Filling over old, loose mastic doesn’t last. Raking out and preparing the joint gives it a sound base so the new mastic stays put. Around Dungate, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.
Why choose Mr Mastic in Dungate
- We never seal over old sealant
- Tidy, careful work
- Anti-fungal silicone where joints get wet
- Homes, businesses and hotels
Windows and doors in Dungate
With historic houses such as Belmont House and Gardens (about 4.6 miles south-east) nearby, there’s older building stock in the area around Dungate 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 is traditional sand mastic. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Sittingbourne station, cracked sand mastic around sash windows lets in the draughts tenants complain about. If you look after a building such as Milstead and Frinsted Church of England Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Dungate is about 3 miles south of Sittingbourne, in Kent. Wherever you are in the ME9 postcode area, our applicators can take on sand mastic. Dungate is one of 922 places in Kent where we work. Chelmsford is on our list too, about 32 miles from Dungate.
Jobs for sand mastic in ME9 is quoted and booked the same way as anywhere else. Other places close to Dungate include Newbury (1 mile north-east), Kingsdown (1 mile east), Rodmersham Green (1 mile north), Highsted (1 mile north) and Bapchild (1 mile north-east). Further out, we also cover Maidstone (10 miles west), Ashford (12 miles south-east), Canterbury (14 miles east), Sittingbourne (3 miles north), Whitstable (13 miles east) and Faversham (6 miles east).
Local landmarks in Dungate
In Dungate, that means homes and buildings near Fulston Manor School and Cromers Wood and the streets around them. For rail, the closest station is Sittingbourne station, about 2.9 miles north of the centre. A little further out are Sittingbourne Heritage Museum (2.6 miles north) and Newnham Castle (2.5 miles south-east).