Kent · England
Sand mastic for sash & case windows in Denton, Kent
Sand mastic across Denton and nearby, with old sealant always removed completely.
- Wind and rain getting in round a sash window
- Patchy fillers round a sash window
- A silicone bead on a sash window that spoils the look
Surface by surface
Period and listed homes
Period homes look their best with traditional materials.
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
About our sand mastic in Denton
Fresh sand mastic forms a skin quite soon, but it takes longer to harden fully. Traditional guidance is not to paint over it and we will advise if you’re redecorating. If you’re dealing with gaps where the frame meets the masonry and mastic dropping out of the joint, we can put it right, on stone surrounds, period & listed homes and brick reveals alike.
In smaller places like Denton, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. The right sealant depends on the frame and on what it sits in.
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.
- Where
- Denton (DA12)
- Region
- Kent
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Other services in Denton
Frames and glazing around Denton
Denton is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. With historic houses such as Cobham College (about 3.1 miles south) nearby, there’s older building stock in the area around Denton as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you live in an older home near Church of St Peter and St Paul, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. If you look after a building such as St John's Catholic Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Denton is about 1 mile east of Gravesend, in Kent. We carry out sand mastic for homeowners, landlords and businesses in Denton, as part of our work across Kent. Across Kent, we cover 922 places, Denton among them. Our Chelmsford page covers work nearby.
Jobs for sand mastic in DA12 is quoted and booked the same way as anywhere else. If you need sand mastic at a property on Barr Road, Mark Lane and Forge Lane or anywhere close by, our applicators can take on the job. Denton sits on or near the A226. Close by, we work in Milton-next-Gravesend (1 mile north-west), Gravesend (1 mile west), Windmill Hill (1 mile west), Singlewell or Ifield (2 miles south-west) and Northfleet (2 miles west). Further out, we also cover Maidstone (13 miles south-east), Dartford (7 miles west), Sevenoaks (14 miles south-west), Swanley (10 miles west), Kings Hill (11 miles south) and Foley Park (12 miles south-east).
Local landmarks in Denton
Locally, jobs take us to homes and businesses close to The Ship & Lobster pub, St John's Catholic Comprehensive and St John's Catholic Comprehensive and the streets around them. For rail, the closest station is Gravesend station, about 1.2 miles north-west of the centre. Well-known places in the area include Gravesham Museum (1.2 miles north-west) and Gravesham Community Hospital (1.4 miles north-west). Not far away are Sawyers Lake and Gad's Hill.
Signs you need sand mastic in Denton
Paint, silicone or cement used over old mastic causes problems. They do not move with the timber, and they normally need raking out.
Common reasons people contact us include:
- Crumbling sand mastic round a window
- Silicone on a period window that looks wrong
- Old cement repairs round a window that have failed
- Draughty sash windows at the surround
Letting a property close to Gravesend station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
What your quote should include
- What the cure time is
- What happens if they find a problem under the old sealant
- Who turns up on the day
- Whether VAT is included
How to look after the new joints
Aftercare is simple:
- Look over the window mastic once a year
- Keep sills and gutters clear so water drains away
- Take care around the mastic when scraping paint
- Ask us before painting near the mastic
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
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 anything from a few hours to a full day, depending on how many windows. In a smaller place like Denton, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- Let us know about parking restrictions
- Let us know about stairs, lifts or work at height
- Mention any leaks or damp you’ve noticed
How to get a quote
Need a quote? Please call 0345 464 0079 or email us and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Read more
Questions from Denton
Do you cover smaller places like Denton?
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.
Does living near the coast affect sand mastic in Denton?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
I’m a tenant. Can you help?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages.
Can new sealant go over the old?
No. New silicone won’t bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Can you do several jobs on one visit?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
How long does the job take?
As a guide, most jobs take a few hours per window, depending on the condition of the joints. Larger jobs naturally take longer, and we will tell you how long to expect.
Can sand mastic be painted?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we will talk you through it.
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
When it is not the sealant
Before you book, it’s worth knowing the limits:
- Planning or listed building consent (your local planning authority decides)
- Putty and glazing repairs
- Crumbling stone or brickwork round the window
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Stone surrounds
- Brick reveals
- Tenement windows
- Sash and case windows
- Timber door frames
- Period & listed homes
Why deal with it now?
Draughts round a sash window aren’t always the sashes. Gaps between the frame and the wall can be just as bad and new mastic seals them. In an older home around Denton, damp from a failed joint can get into timber and plaster, and that is a much bigger job than renewing the sealant.
What it costs depends on how much there is to do, how hard the old material is to remove and access to the work. We give a clear quote before work begins.
Why Denton customers choose us
- Old sealant always removed completely
- Tidy, careful work
- Quality sealants from Arbo and Everbuild
- Homes, businesses and hotels
See how sealant jobs are priced and our reviews.