Isle of Wight · England
Branstone Window Mastic
Window mastic across Branstone and nearby, with every bit of old sealant taken out first.
- Gaps between the frame and the inside reveal
- White mastic on grey or black frames
- Damp patches on the reveal after heavy rain
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
How we handle window mastic in Branstone
A cold draught around a closed window often comes from the frame edge. Resealing that joint can make a room feel noticeably less draughty. If the draught is through the window seals instead, we will tell you. If you have mastic that’s falling out in pieces and draughts coming in around windows and doors, we can put it right.
Outdoor sealant needs dry, clean surfaces, so work on frames around Branstone is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Branstone (PO36)
- Region
- Isle of Wight
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
When it is not the sealant
It helps to know what we can’t do too:
- Damp problems in the wall away from the window
- Condensation trapped between the panes
- Faulty window hardware
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think before booking.
What we seal
- Patio & French doors
- Window sills
- uPVC windows
- Composite doors
- Timber windows & doors
- Aluminium frames
What happens on the day
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a handful of frames, longer for a whole house and we leave things clean and tidy. For a village or hamlet like Branstone, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- 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
- Mention if the joints have been sealed before
- Mention any parking rules near the property
- Mention any sign-in or site rules at work premises
How to get a quote
To get a quote, ring 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll send you a clear quote before any work starts.
Related advice
Also near Branstone
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How the job changes by surface
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We’ll tell you which suits your home.
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
Questions from Branstone
Does the coastal weather in Branstone affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. Walls facing the sea are normally the first to need attention.
Do you cover smaller places like Branstone?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you reach windows above the ground floor?
Yes, in most cases. Access is planned before we start.
Can you seal over the old sealant?
No. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
Is there any odour?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Can tenants book the work?
Of course. Ask your landlord first, and we can send them the quote if that helps.
Common problems we fix in Branstone
Older frames were often sealed with products that set hard. Once it’s rigid, every bit of frame movement pulls at it, leaving a hairline gap down one side.
These are the problems we are asked about most:
- White mastic on grey or black frames
- Draughts coming in around windows and doors
- Leaking joints at the ends of sills
- Gaps between the frame and the inside reveal
Managing a site like Newchurch Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
What to look for in a quote
- What preparation is included
- How much experience the applicator has
- How hidden problems are handled
- What the quote includes, VAT included or not
What happens if it’s left?
Not every sealant suits a window. Interior caulk and bathroom silicone aren’t made for exterior frame joints. A low-modulus exterior sealant keeps its stretch through hot and cold weather. Older cottages and farmhouses around Branstone can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What you get with us
- Neat joints and a tidy finish
- White, clear, grey or another colour, product permitting
- Arbo and Everbuild products
- 4.9 on Google from 180+ five-star reviews
See our cost guide or our reviews.
What window mastic looks like in Branstone
Branstone 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. 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.
For landlords with property near Shanklin station, renewing tired window mastic between tenants heads off draught and damp complaints. In the older streets around All Saints' Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Branstone is about 5 miles south-east of Newport, in the Isle of Wight. Homes, rented property, offices and hotels in Branstone is covered for window mastic. The work is guaranteed for a year. Branstone is one of 125 places in the Isle of Wight where we work for window mastic. There’s also a page for Portsmouth, about 12 miles away.
Postcode districts we cover here for window mastic: PO36. If you need window mastic at a property on Branstone Farm Lane and Stockmans Close or anywhere close by, our applicators can take on the job. We also cover Winford (1 mile east), Apse Heath (1 mile south-east), Princelett (1 mile south), Hale Common (1 mile west) and Newchurch (1 mile north). Larger places within reach include Newport (5 miles north-west), Ryde (5 miles north-east), Cowes (8 miles north-west), Ventnor (4 miles south), East Cowes (8 miles north-west) and Oakfield (5 miles north-east). Remote and island addresses need a little more planning, so please mention your location when you phone 0345 464 0079 or send us an email.
Near you in Branstone
Around Branstone, our work takes us to homes and buildings near Sandown Bay Academy, among other places. The nearest railway station is Shanklin station, roughly 1.9 miles south-east of the centre. Other landmarks nearby include Wight Aviation Museum (1.3 miles east) and Arthur Webster Memorial Hospital for Children (1.8 miles south-east). Green spaces nearby include Alverstone Mead and Stenbury Down.
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Repaint timber before it’s bare
- Walk round the house once a year and look at the joints
- Avoid blasting the frames with a pressure washer
- Don’t paint over the silicone
Keep the new mastic undisturbed while it cures, following the cure time we give you. Don’t point a pressure washer at the joints.
Water trapped behind a failed joint can start rot in timber frames and sills. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.