Isle of Wight · England
Window Mastic in Alverstone
Professional window mastic in and around Alverstone, with every bit of old sealant taken out first and a one-year guarantee.
- Damp patches on the reveal after heavy rain
- Draughts coming in around windows and doors
- Cracked or shrunken mastic around the frame
Alverstone questions
Does the coastal weather in Alverstone 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. It’s worth checking the walls that face the sea first.
Do you work for landlords with property near Sandown station?
Yes, we work for letting agents and landlords. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Do the sealants smell?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
Where do you work from?
We’re based in Crawley, and we work across South East England, London and Scotland.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Can you reach windows above the ground floor?
Yes, if safe access is possible. Higher or awkward frames may need extra access, and we’ll confirm what’s needed.
Window mastic in Alverstone
Behind a thin line of old mastic there’s sometimes a deep void. Packing it solid with sealant gives a joint that can’t flex, so deep gaps get backing rod first. The sealant then grips the two sides it should. If you have hard, cracked sealant around windows and cracked internal joints between frame and plaster, we can help, on composite doors, window sills and patio & French doors alike.
Outdoor sealant needs dry, clean surfaces, so work on frames around Alverstone is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- Alverstone (PO36)
- Wider area
- Isle of Wight
- Guarantee
- A year, on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Soft or decayed wood in the frame
- Broken hinges, locks or handles
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Surfaces we seal
- Timber windows & doors
- uPVC windows
- Window sills
- Composite doors
- Patio & French doors
- Aluminium frames
What the job involves on each surface
uPVC windows
The frame is cleaned with a product that won’t harm the plastic, then the new bead is laid against the frame and the wall.
Patio & French doors
Not every patio door leak is a mastic problem: blocked drain slots, worn brush seals and threshold details can let water in too. We look for the cause first.
Nearby places to Alverstone
Also in Alverstone
What happens if it’s left?
Running fresh sealant over the old joint is tempting, but it won’t grip old, dirty sealant. It peels before long, and water still gets in behind. Proper resealing starts with removing the old joint. Where a wall is exposed, as many are in small places like Alverstone, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first and give you a clear price before work begins.
Why book with us
- Over 20 years’ experience
- One-year guarantee on every job
- Trusted Arbo and Everbuild sealants
- A sealant colour to suit the surroundings
Read how sealant jobs are priced and our reviews.
Landlords, agents and businesses in Alverstone
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can go on one quote.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Don’t paint over the silicone
- Keep paint and stain on wooden frames in good order
- Walk round the house once a year and look at the joints
- Air rooms to keep condensation down around windows
Wipe the frames with soapy water when you clean the windows, and avoid solvent cleaners on the sealant.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. Resealing closes it.
What window mastic looks like in Alverstone
Alverstone is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on the mastic around window and door frames, especially on the side facing the sea. With historic houses such as Haseley Manor (about 1.8 miles west) nearby, there’s older building stock in the area around Alverstone as well as newer homes. 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 Newchurch Primary School, larger buildings have plenty of frames, and the mastic around each one ages. If you live in an older home near All Saints' Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Letting a property close to Sandown station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Alverstone is about 4 miles south of Ryde, in the Isle of Wight. Jobs in Alverstone get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our the Isle of Wight coverage runs to 125 places, Alverstone among them. Portsmouth is on our list too, around 11 miles away.
Work in PO36 is quoted and booked the same way as anywhere else. We also cover the places around Alverstone: Alverstone Garden Village (1 mile north-west), Queen's Bower (1 mile south-west), Skinner's Hill (1 mile west), Adgestone (1 mile north-east) and Lake (1 mile south-east). We also work in nearby towns such as Newport (5 miles north-west), Ryde (4 miles north), Cowes (8 miles north-west), Ventnor (5 miles south), East Cowes (8 miles north-west) and Oakfield (4 miles north). Island and remote addresses take a little more planning, so please mention your location when you ring 0345 464 0079 or send us an email.
Around Alverstone
We work in homes and buildings around Sandown Bay Academy, The Bay Church of England School and The Pointer Inn, among other places. For rail, the closest station is Sandown station, about 1.1 miles south-east of the centre. A little further out are Arthur Webster Memorial Hospital for Children (2 miles south) and Wight Aviation Museum (0.7 miles south). Green spaces nearby include Brading Down and Alverstone Mead.
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly.
The process
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the job takes anything from an hour or two to a full day, depending on how many frames there are in most cases. In a small place like Alverstone, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check how each frame can be reached safely.
- All the failed sealant is cut away, along with any loose debris.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
How to prepare
- Mention any parking rules near the property
- Tell us about any water getting in
- Move anything stored near the joints
Getting a quote
For window mastic in Alverstone, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.