Medway · England
Window & door mastic in Capstone, Medway
Mastic around window and door frames, sills and patio doors for homes and businesses in Capstone and across Medway. Fully insured, ARBOMaster approved and guaranteed for a year.
- Cracked internal joints between frame and plaster
- Hard, cracked sealant around windows
- A bead that does not match the frame
Window mastic in Capstone
Colour matters on a frame. White, brown, anthracite grey, black and clear sealants are all available, so the bead blends with the window rather than framing it. Typical jobs include water coming in at the bottom corners of a door and old mastic that has gone black or come away, across timber windows & doors, uPVC windows and composite doors.
Around Capstone, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
You are covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or drop us an email.
- Location
- Capstone (ME7)
- Region
- Medway
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Common problems we fix in Capstone
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and timber moves with moisture as well as temperature.
The most common problems we see are:
- Cracked or shrunken mastic around the frame
- Draughty joints inside around the window
- Leaking joints at the ends of sills
- Damp patches on the reveal after heavy rain
If you look after a building such as Hempstead Infant School, the mastic around its windows and doors needs looking after like any other building’s.
What to look for in a quote
- How much experience the applicator has
- Are they insured?
- What happens if they find a problem under the old sealant
- Whether they seal over old material or remove it
What we do, step by step
All our tools and materials come with us in the van, so you don’t need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. Most jobs take a morning for a couple of windows and a door. Somewhere as small as Capstone, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Mention any sign-in or site rules at work premises
- Let us know about stairs, lifts or work at height
- Mention if the joints have been sealed before
How to get a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.
Advice
Windows and doors in Capstone
Capstone 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 window and door frames, which can dry out and crack sooner where a building faces the weather. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to All Saints Church include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in. Rented homes near Gillingham (Kent) station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Capstone is about 1 mile south-west of Gillingham, in Medway. Capstone gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Across Medway, we cover 68 places, Capstone among them. There’s also a page for Chelmsford, roughly 26 miles from Capstone.
Work in ME7 works the same way as everywhere else we cover. If you are just outside Capstone, we cover Darland (1 mile north), Hale (1 mile north-west), Hempstead (1 mile south-east), Gillingham (1 mile north-east) and Chatham (1 mile west). Larger places within reach include Rochester (4 miles north-west), Strood (4 miles north-west), Hoo St Werburgh (5 miles north), Rochester Riverside (3 miles north-west), Peters Village (4 miles west) and Brompton (3 miles north-west).
Near you in Capstone
Around Capstone, our work takes us to homes and buildings near Chatham Grammar School for Girls, The Star pub and The Robert Napier School. For rail, the closest station is Gillingham (Kent) station, about 2 miles north. Other landmarks nearby include Medway Maritime Hospital (1.7 miles north-west) and Pentagon Shopping Centre (2.3 miles north-west). For a walk, there’s Burham Down and Blue Bell Hill.
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Wipe condensation off the frames
- Avoid harsh chemicals near the mastic
- Keep jet washers away from the mastic
- Walk round the house once a year and look at the joints
Wipe the frames with soapy water when you clean the windows, and avoid solvent cleaners on the sealant.
Water gets in quietly when mastic fails. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.
What the job involves on each surface
Patio & French doors
Heavy door frames can move more than windows. A flexible sealant copes with that.
Window sills
The end joints of a sill tend to fail before the rest. A tight seal at each end keeps rain out of the wall.
FAQs for Capstone
Is Capstone within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
I let a flat near Gillingham (Kent) station. Can you help?
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 we start.
How long will my window job take?
A few frames take a few hours. You will get a timescale with the quote.
What information do you need?
Just the basics: where it is, what you’ve noticed and how we reach it. After that, simply ring 0345 464 0079 or email us.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access, and for outside work we’ll agree access with you when we book.
Is it OK to seal over old sealant?
No. We remove every bit of old sealant first.
Will resealing my frames help with draughts?
Yes, if the air is getting in around the frame. If it’s coming through the window seals, we’ll tell you.
What sealant do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Other services in Capstone
What happens if it’s left?
Once mastic fails, rain can get between the frame and the wall. Over time that can mean damp patches, damaged plaster and rotting timber. A reseal is a much smaller job. Older cottages and farmhouses around Capstone can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re not sure whether it needs doing, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
What you get with us
- White, clear, grey or another colour, product permitting
- ARBOMaster approved applicator
- A 12-month guarantee on all work
- Fully insured
What affects the cost of window mastic
For a quick quote, just ask. What matters most is:
- Whether there’s mould to deal with
- Working hours on commercial sites
- How much there is to do
- How much old sealant there is and how hard it is to remove
The cost reflects the work involved, not guesswork. That is why we ask a few questions first and send you a clear quote before any work starts.
What we need to know
Photos help, but a description is a good start. Please mention:
- The address or postcode of the job
- Any access issues, like height or stairs
- A few pictures by email, if you can
- The type of property
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
When it isn’t the sealant
We won’t take on work that won’t last, so here’s what sealant can’t put right:
- Condensation trapped between the panes
- A sash or casement that won’t close properly
- Penetrating damp from a failed cavity tray or render
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
Surfaces we seal
- Window sills
- Patio & French doors
- uPVC windows
- Timber windows & doors
- Composite doors
- Aluminium frames