Isle of Wight · England
External & façade joints in Sandown, Isle of Wight
External mastic in Sandown from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rain getting behind render or cladding at a joint
- Hard, crazed mastic that has stopped moving
- Leaking joints around cladding and façade panels
About our external mastic in Sandown
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. The colour is chosen to suit the brick or render so the line blends in. If you are dealing with cracked joints where brick meets render or frames and old sealant gone brittle and cracked, we can help, on render & cladding joints, façade panels and joints between brick and frames alike.
Houses in smaller places like Sandown can stand more in the open than those in a built-up town, so exposed walls and rooflines take more wind-driven rain. That is where gutter joints and wall joints tend to fail first.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.
- Location
- Sandown (PO36, PO37)
- Wider area
- Isle of Wight
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Looking after it afterwards
Aftercare is simple:
- Show decorators and builders where the movement joints are
- Ask before painting over external sealant
- Have failed joints looked at early
- Keep soil, plants and ivy away from the joints
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges and let water in behind.
Act while the splits are small. At that stage it’s a simple cut out and reseal before water has had years to get in.
Questions from Sandown
Will you come out to Sandown?
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.
Does the coastal weather in Sandown affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. Walls facing the sea are generally the first to need attention.
Will it make a mess?
Tidy work is part of the job. Nearby surfaces are protected.
How often do external joints need resealing?
It depends on the exposure, the movement and the product. Treat it as a maintenance item and look at it yearly and renew it when it starts to fail.
Can you seal joints between two different materials?
Yes. Where different materials meet is one of the most common joints we seal. We use a flexible sealant suited to both surfaces, primed where needed.
What is a movement joint?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking.
Will the new joint stand out?
We aim for a joint that suits the wall rather than one that jumps out. We will talk through colour options before work begins, matched as closely as the range allows.
Is it worth trying it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Why deal with it now?
Running new sealant over the old bead rarely lasts. New sealant does not bond well to old, weathered sealant, so the old joint is cut out fully first. Around Sandown, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
Combining jobs into one visit is generally more efficient than separate visits. We will send you a clear quote for the lot.
Why Sandown clients choose us
- Any old sealant cut out fully, not covered over
- Arbo and Everbuild products
- Homes, businesses and hotels
- Full insurance on every job
Take a look at what affects the cost and customer reviews.
What external mastic looks like in Sandown
Sandown is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. With historic houses such as Morton Manor (about 1.5 miles north-east) nearby, there’s older building stock in the area around Sandown as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
If you look after a building such as The Bay Church of England School, larger buildings have long runs of movement joint that eventually need resealing. Letting a property close to Sandown station? Then split movement joints are easy to miss on a rental until damp shows inside.
Sandown is about 10 miles south of Gosport, in the Isle of Wight. Wherever you are in the PO36 postcode area, we cover external mastic for homes and businesses. Our area takes in 125 places across the Isle of Wight, from the larger towns to small villages. Our Portsmouth page covers work nearby, about 11 miles away.
Here we cover the PO36 and PO37 postcode area for external mastic. External mastic is available to properties on High Street, Nunwell Street and Park Rise and the roads around them. Sandown sits on or near the A3055 and A3056. We also cover Lake (1 mile south-west), Yaverland (1 mile north-east), Adgestone (1 mile north), Alverstone (1 mile north-west) and Morton (1 mile north-east). Larger places within reach include Newport (7 miles north-west), Ryde (5 miles north), Cowes (10 miles north-west), Ventnor (5 miles south-west), East Cowes (9 miles north-west) and Oakfield (5 miles north). Sandown is one of the larger places we cover in the Isle of Wight. For island and remote addresses, the job takes a little more planning.
Near you in Sandown
We work in homes and buildings around The Old Comical pub, Sandown Bay Academy and Broadlea Primary School. There’s a railway station in Sandown itself: Sandown station. Nearby you will also find National Poo Museum (under half a mile south) and Arthur Webster Memorial Hospital for Children (1.6 miles south-west). Green spaces nearby include Alverstone Mead and Brading Down.
Surface by surface
Render joints
Cracks along render joints let water in behind the coat. A sound joint keeps the render dry behind and helps it last.
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best year round.
Signs you need external mastic in Sandown
Some movement joints have been pointed up with mortar. The joint can’t move, so the wall cracks somewhere else instead.
Look out for any of the following:
- Weeds or debris growing in open joints
- Water getting into walls through failed joints
- Cracked joints where brick meets render or frames
- Brick movement joints where the sealant has split
Homes close to Christ Church include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
What your quote should include
- How hidden problems are handled
- How much experience the applicator has
- Are they insured?
- What the quote includes, VAT included or not
What we do, step by step
We keep the work tidy and contained to the joints we’re treating, so you can carry on as normal. Expect the work to take a few hours to a few days, depending on the length of joint and the access. A visit to Sandown is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- 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.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Try not to wet indoor joints just before the visit
- Clear items away from the joints we’re working on
Getting a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that’s easy.
Advice
What else we do in Sandown
What we can’t put right
In fairness, some problems need a different trade:
- Subsidence or other structural problems
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Adding movement joints to masonry that has none
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
Where we work in Sandown
- Concrete & block
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
Quotes for external mastic in Sandown
Call for a quick quote. The main things that affect it are:
- The product the joint needs
- Access and height
- How many rooms, windows or areas are involved
- Any working-time requirements on site
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re unsure, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
Helping us quote
When you call or email, it’s useful to know:
- If it’s domestic, commercial or a hotel
- Pictures of the joints, sent by email
- Whether it has been sealed before
- Roughly how big the job is
For a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. You’ll have a clear quote before work begins.