Medway · England
Window Mastic in Borstal
Mastic around window and door frames, sills and patio doors for Borstal, backed by a 12-month guarantee. Ask us for a quote.
- Whistling draughts around closed windows
- Gaps left after new windows were fitted
- A bead that does not match the frame
How we handle window mastic in Borstal
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. The sealant then grips the two sides it should. Typical jobs include sealant in the wrong colour for the frame and mastic that has split away from the wall, on patio & French doors, aluminium frames and composite doors.
In a smaller place like Borstal, some walls face open ground and catch the full force of the weather. The mastic around frames on those walls tends to age faster.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Place
- Borstal (ME1, ME2)
- Wider area
- Medway
- Guarantee
- One year on every job
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we’re called out for in Borstal
Frames are never completely still. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the masonry beside it stays put. A sealant that cannot keep up eventually tears.
These are the problems we are asked about most:
- Mastic that is falling out in pieces
- Mastic that has split away from the wall
- Rushed sealant from a window installation
- Damp patches on the reveal after heavy rain
Homes close to St Matthew's include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Questions to ask before you book
- How long the guarantee is
- What happens if they find a problem under the old sealant
- What product goes in the joint
- Whether they seal over old material or remove it
What the job involves on each surface
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A neat, narrow bead in a colour to match keeps the clean look.
Timber windows & doors
Soft or rotten wood can’t be sealed successfully. If we find rot, we will tell you before going ahead, as a joiner will need to deal with it.
What happens on the day
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours for a handful of frames, longer for a whole house. In a smaller place like Borstal, 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.
- We start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
How to prepare
- Let us know if you’ve seen damp or leaks
- Tell us about access, such as stairs, a lift or high-level joints
- Mention if the joints have been sealed before
Ask for a quote
We quote each job on its own, so start by telling us what you need. Simply call 0345 464 0079 or drop us an email and describe the job and send pictures if you have them.
Related advice
What happens if it’s left?
Once mastic fails, rain can get between the frame and the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. Resealing now is a small job by comparison. Around Borstal, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
What you get with us
- We agree the colour with you first
- Quality sealants from Arbo and Everbuild
- Tidy, careful work
- We never seal over old sealant
Honest limits
We will not take on work that won’t last, so these are the limits:
- A sash or casement that won’t close properly
- Worn gaskets, brush seals or a door that has dropped
- Misting between the panes of a double-glazed unit (that needs a new unit)
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
Where we work in Borstal
- Timber windows & doors
- Window sills
- Aluminium frames
- Composite doors
- uPVC windows
- Patio & French doors
Towns and villages near Borstal
What else we do in Borstal
Frames and glazing around Borstal
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Temple Manor (about 1 mile north) are a reminder that the area around Borstal 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.
If you look after a building such as St William of Perth Roman Catholic Primary School, its window and door frames need their mastic kept sound, just like a home’s. Rented homes near Cuxton station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Borstal is about 1 mile south-west of Rochester, in Medway. Every kind of property in Borstal can book us for window mastic. Every job comes with our 12-month guarantee. 68 places in Medway are on our list, from the larger towns to small villages. There’s also a page for Chelmsford, about 25 miles away.
Jobs for window mastic in ME1 and ME2 is quoted and booked the same way as anywhere else. Local streets include Hill Road, Manor Lane and Mount Road. You’ll find Borstal on the M2, so it’s easy for us to get to. Close by, we work in Rochester (1 mile north-east), Strood (1 mile north), Cuxton (1 mile west), North Halling (2 miles west) and Wouldham (2 miles south-west). We also work in nearby towns such as Gillingham (4 miles east), Rainham (5 miles east), Park Wood (5 miles east), Lordswood (4 miles south-east), Twydall (4 miles east) and Hoo St Werburgh (5 miles north-east).
Near you in Borstal
Typical jobs here are in homes near Sir Joseph Williamson's Mathematical School, Former Ordnance Store At Chatham Gun Wharf and St John Fisher RC Comprehensive School. The closest station to Borstal is Cuxton station, roughly 1 mile west. Nearby you’ll also find Six Poor Travellers House (1.3 miles north-east) and Rochester Castle (1.3 miles north-east). Green spaces nearby include Blue Bell Hill and Ranscombe Farm.
What affects the cost of window mastic
Every job gets its own quote. These are the things that affect it:
- The size of the job
- Whether old sealant or filler has to be cut out
- Any mould that needs treating
- The product the joint needs
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we will explain what it covers.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- Any access issues, like height or stairs
- If someone has resealed it before
- Pictures of the joints, sent by email
- How many joints, rooms or windows are involved
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. When it suits you, call 0345 464 0079 or email us.
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Wipe condensation off the frames
- Walk round the house once a year and look at the joints
- Avoid blasting the frames with a pressure washer
- Keep paint and stain on wooden frames in good order
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.
Borstal questions
Can you do window mastic in Borstal?
Yes. Our work covers London and the South East, and Borstal is part of that. You can call 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear quote.
Do you cover smaller places like Borstal?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
Do you work for letting agents?
Yes. We work for homeowners, landlords, letting agents, businesses and hotels in Borstal.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator.
What do you need from me for a quote?
A short description and the location, with pictures by email if possible. If we need more, we’ll ask.
Where is Mr Mastic based?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
How many windows can you do in a day?
A few frames take a few hours. We confirm the timing with your quote.