Kent · England
Window Mastic in Barnes Cray
Window mastic in Barnes Cray from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Old mastic that has gone black or come away
- Damp patches on the reveal after heavy rain
- Cracked or shrunken mastic around the frame
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
Window mastic in Barnes Cray, done properly
Behind a thin line of old mastic there’s sometimes a deep void. Filling it with sealant alone leaves a joint that can’t move properly, so deep gaps get backing rod first. That way the new bead bonds to the frame and the wall only. We work on aluminium frames, patio & French doors and window sills, and the jobs we see most are draughts coming in around windows and doors and sealant in the wrong colour for the frame.
Many houses in smaller places like Barnes Cray 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.
The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or email us.
- Where
- Barnes Cray (DA1, DA8)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Places near Barnes Cray
Other services in Barnes Cray
Barnes Cray homes and the weather
With historic houses such as Hall Place and Gardens (about 1.7 miles south-west) nearby, there’s older building stock in the area around Barnes Cray 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. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as Haberdashers' Aske's Crayford Academy, its window and door frames need their mastic kept sound, just like a home’s. If you live in an older home near Christ Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Barnes Cray is about 2 miles north-west of Dartford, in Kent. Our applicators cover window mastic for homes and businesses in Barnes Cray. Across Kent, we cover 922 places, Barnes Cray among them. We also work in London, about 13 miles from Barnes Cray.
Our applicators cover all of DA1 and DA8 for window mastic and the streets around it. Whether your property is on Stour Road, Wilmot Road and Maiden Lane or a nearby road, we can help. Other places close to Barnes Cray include 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). We also work in nearby towns such as 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).
What’s near Barnes Cray
In Barnes Cray, that means homes and buildings near Braeburn Park, Bird in Hand pub and Holy Trinity Church of England Primary School and the streets around them. Barnes Cray’s nearest station is Slade Green station, about 0.7 miles north. Nearby you will also find West Hill Hospital (1 mile south-east) and Dartford Library (1.4 miles south-east). Open spaces near Barnes Cray include Wansunt Pit.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Repaint timber before it’s bare
- Paint up to the joint, not over it
- Make sure the drainage slots are not blocked
- Don’t use solvent cleaners on the joint
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. A new joint closes it up.
What we’re called out for in Barnes Cray
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, leaving a hairline gap down one side.
Signs it’s time to call us include:
- White mastic on grey or black frames
- Gaps between the frame and the inside reveal
- Cold air getting in at the frame edge
- Untidy mastic left by window fitters
For landlords with property near Slade Green station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
What to look for in a quote
- Which colour the sealant will be
- The length of the guarantee
- What preparation is included
- What happens if they find a problem under the old sealant
What sealant work cannot fix
Before you book, it’s worth knowing the limits:
- Rotten timber, which needs a joiner first
- Damp problems in the wall away from the window
- Broken hinges, locks or handles
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before booking.
Where we work in Barnes Cray
- Composite doors
- Timber windows & doors
- Aluminium frames
- Window sills
- Patio & French doors
- uPVC windows
For landlords and businesses
We work for letting agents and landlords as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
What happens on the day
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes a few hours for a few frames, or a day or more for a whole house. Parking around Barnes Cray is normally 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 window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- Where gaps are deep, backing rod goes in first.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Preparing for the visit
- Keep children and pets away from the work area
- Where the joints are inside, avoid wetting them before we arrive
- Clear the area around the work
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work and give you a clear price.
Related advice
Why act early in Barnes Cray
Getting a straight, even bead on an outside frame takes practice, especially upstairs. We cut out properly, back deep gaps and tool every joint neatly, using a product chosen for the frame and wall. In an older home around Barnes Cray, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
Leaving a failed joint normally makes the job bigger, not smaller. If you’re unsure, call 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
Why Barnes Cray clients choose us
- Anti-fungal sanitary silicone in wet areas
- A sealant colour to suit the surroundings
- Experience in homes, commercial sites and hotels
- We agree the colour with you first
Read what affects the cost and customer reviews.
Questions from Barnes Cray
Can you help a landlord with a rental near Slade Green station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Can you do window mastic in Barnes Cray?
Yes, Barnes Cray is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
How many windows can you do in a day?
A handful of frames is a short visit, while a whole house takes longer. We confirm the timing with your quote.
Will you leave a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Will there be a smell?
There can be a smell while the sealant cures, but it fades. Ventilation helps.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
How long before the joint can be used?
Cure times vary by product and the conditions. Before we leave, we will tell you the cure time.
What do you need from me for a quote?
Just the basics: the address or postcode, what’s wrong and any access issues. Then phone 0345 464 0079 or drop us an email.