Kent · England
Sand mastic for sash & case windows in Barnes Cray, Kent
Sand mastic across Barnes Cray and nearby, with every bit of old sealant taken out first.
- Old sand mastic that has cracked, crumbled or fallen out
- Open joints round the window box
- Patchy fillers round a sash window
What we can’t put right
In fairness, there are a few things sealant will not fix:
- Cracked or broken glass
- Sashes that rattle, stick or won’t open
- Damaged stone surrounds
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly.
Joints and surfaces we work on
- Tenement windows
- Timber door frames
- Stone surrounds
- Sash and case windows
- Period & listed homes
- Brick reveals
About our sand mastic in Barnes Cray
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It suits period and listed homes, where modern sealant can look out of place. We work on stone surrounds, brick reveals and sash and case windows, and people most often call us about mastic round period door frames that has failed and mastic that needs renewing before redecorating.
Many houses in smaller places like Barnes Cray have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows.
Every job comes with our one-year guarantee.
- Where
- Barnes Cray (DA1, DA8)
- Region
- Kent
- Cover
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How the job changes by surface
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.
Windows and doors in Barnes Cray
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. Historic houses like Hall Place and Gardens (about 1.7 miles south-west) are a reminder that the area around Barnes Cray has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Homes close to Christ Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For landlords with property near Slade Green station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Barnes Cray is about 2 miles north-west of Dartford, in Kent. We carry out sand mastic for homeowners, landlords and businesses in Barnes Cray and nearby, as part of our work across Kent. Our Kent coverage runs to 922 places, and Barnes Cray is one of them. There’s also a page for London, roughly 13 miles from Barnes Cray.
Here we cover the DA1 and DA8 postcode area for sand mastic. You’ll find streets such as Stour Road, Wilmot Road and Maiden Lane, all of which we cover. Nearby, we also carry out sand mastic in Slade Green (1 mile north), North End (1 mile north), Crayford (1 mile south-west), Barnehurst (1 mile west) and Bexley Riverside (1 mile north-west). Further out, we also cover Sevenoaks (12 miles south), Gravesend (8 miles east), Northfleet (7 miles east), Swanley (4 miles south), Swanscombe (4 miles east) and Windmill Hill (8 miles east).
Landmarks near Barnes Cray
We work in homes and buildings around Braeburn Park, Bird in Hand pub and Holy Trinity Church of England Primary School and the streets around them. The closest station to Barnes Cray is Slade Green station, about 0.7 miles north. A little further out are West Hill Hospital (1 mile south-east) and Dartford Library (1.4 miles south-east). Not far away are Wansunt Pit.
The process
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours per window, depending on the condition of the joints. Parking around Barnes Cray is generally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- We start by checking each surround and agreeing the joints to renew.
- 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.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Tell us if parking is tricky
- Tell us about any water getting in
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, ring 0345 464 0079 or drop us an email.
Advice
Common questions in Barnes Cray
I let a flat near Slade Green station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Can you do sand mastic in Barnes Cray?
Yes. Our work covers London and the South East, and Barnes Cray is part of that. Just ring 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear price.
Is sand mastic better than silicone for my windows?
For period timber windows in stone or brick, sand mastic is often the better fit. On modern frames, we’d normally use a flexible sealant, and we will explain why.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
What information do you need?
Tell us what needs doing and where, plus pictures if you have them. If we need more, we will ask.
Is it possible to take out silicone and use sand mastic instead?
Usually, yes. Once the silicone is out and the joint prepared we point it with sand mastic.
Is it possible to paint over sand mastic?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we’ll advise.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
For landlords and businesses
Hotels need rooms back in use, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
What we’re called out for in Barnes Cray
Some old mastic was never deep enough. A thin layer doesn’t hold well, which is why we pack deep voids first and get the depth right.
Common reasons people contact us are:
- Gaps between timber frames and stone or brick
- Old sand mastic that has cracked, crumbled or fallen out
- Draughts and rain around sash boxes
- Cement or filler used on old window joints that has cracked
If you look after a building such as Haberdashers' Aske's Crayford Academy, larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before you book
- Whether they seal over old material or remove it
- When the joint can take water or movement
- What the quote includes, VAT included or not
- Who turns up on the day
Towns and villages near Barnes Cray
Other services in Barnes Cray
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
Quotes for sand mastic in Barnes Cray
Your quote is based on your job. We take into account:
- How many areas need sealing
- Working hours on commercial sites
- The type of sealant required
- Whether the work is at height
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we will explain what it covers.
What to tell us for a quote
What to tell us when you ask for a quote:
- If someone has resealed it before
- The problem you’ve noticed
- A few pictures by email, if you can
- How we’d reach the joints
Want a quote for sand mastic? Please ring 0345 464 0079 or send us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.