Isle of Wight · England
External Mastic in Alverstone
Sealing brickwork movement joints, render, cladding and façade joints in Alverstone, with a 12-month guarantee on every job. Ask us for a quote.
- Leaking joints around cladding and façade panels
- Water getting into walls through failed joints
- Joints pointed up with cement by mistake
What happens on the day
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it generally takes anything from a few hours to several days, depending on the building. For a village or hamlet like Alverstone, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Move anything stored near the joints
- Mention if the joints have been sealed before
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
For external mastic in Alverstone, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
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External mastic in Alverstone, done properly
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. Common call-outs are for hard, crazed mastic that has stopped moving and leaking joints around cladding and façade panels, on joints between brick and frames, façade panels and copings & trims.
Somewhere as small as Alverstone, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
Every job comes with a 12-month guarantee, wherever you are in the Isle of Wight.
- Where
- Alverstone (PO36)
- Wider area
- Isle of Wight
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Why it’s worth doing now in Alverstone
Water gets in through a failed movement joint and can run behind render or cladding. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. In a small place like Alverstone, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Leaving a failed joint usually makes the job bigger, not smaller. If you are unsure, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why Alverstone customers choose us
- We’re fully insured
- Old sealant always removed completely
- Domestic, commercial and hotel work
- Sealant colour chosen to suit
See what affects the cost and our reviews.
How we quote for external mastic
You will get a clear quote before any work starts. It’s based on:
- The old material and how stubborn it is
- The number and length of the joints
- The number of rooms or windows
- Any working-time requirements on site
Combining jobs into one visit normally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We will give you a clear price for the lot.
What we need to know
What to tell us when you ask for a quote:
- Where the job is, and your postcode
- The problem you’ve noticed
- The rough size of the job
- Pictures of the joints, sent by email
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that is easy.
Keeping the joints in good condition
Good habits help new joints last longer. Our tips:
- Look over the joints every year, ideally after winter
- Check the sealant is paintable before painting near it
- Point out the joints to other trades
- Keep water from gutters off the wall
Follow the cure time we give you before the joint is knocked or disturbed. Most exterior sealants skin fast but take longer to cure right through.
Once a joint cannot move, the wall finds another way, normally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
When something else is needed
A few problems are outside what sealant work can do:
- Failed render or damaged cladding panels
- Cracking across the wall rather than at a joint
- Adding movement joints to masonry that has none
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think before booking.
Where we work in Alverstone
- Render & cladding joints
- Concrete & block
- Façade panels
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
Alverstone: your questions answered
Is external mastic in a coastal place like Alverstone any different?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. The right product, a clean joint and the right depth all help it cope.
I let a flat near Sandown station. Can you help?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or email us with the details for a clear quote.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we are using.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We will tell you how long to leave the joint.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Can you seal over the old sealant?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
Walls and rooflines in Alverstone
Alverstone is within about 2 miles of 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 movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Sandown station, split movement joints are easy to miss on a rental until damp shows inside. For site and facilities teams at buildings such as Newchurch Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Alverstone is about 4 miles south of Ryde, in the Isle of Wight. For external mastic in and around Alverstone, please call 0345 464 0079 or drop us an email for a quick quote. We’re based in Crawley and cover the Isle of Wight, Alverstone included. Alverstone is one of 125 places in the Isle of Wight where we work for external mastic. We also work in Portsmouth, around 11 miles away.
We work across the PO36 postcode area for external mastic. If you’re just outside Alverstone, we cover 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). Further out, we also cover 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). If you’re somewhere remote, the job takes a little more planning, so let us know when you get in touch.
Around Alverstone
In Alverstone, that means homes and buildings near Sandown Bay Academy, The Bay Church of England School and The Pointer Inn. Alverstone’s nearest station is Sandown station, roughly 1.1 miles south-east of the centre. Nearby you will also find Arthur Webster Memorial Hospital for Children (2 miles south) and Wight Aviation Museum (0.7 miles south). Open spaces near Alverstone include Brading Down and Alverstone Mead.
When to call us in Alverstone
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. All of that ends up in the joint sealant.
These are the problems we are asked about most:
- Moss and dirt in joints with no sealant left
- Joints pointed up with cement by mistake
- Sealant pulling away from one side of the joint
- Weathered mastic that no longer stretches
Homes close to All Saints' Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
What to look for in a quote
- What the quote includes, VAT included or not
- What guarantee comes with the work
- How the surfaces are prepared before sealing
- Who does the work, and how experienced they are