Isle of Wight · England
External Mastic in Lake
External mastic for Lake, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Movement joints with cracked, split or missing sealant
- Moss and dirt in joints with no sealant left
- Hard, crazed mastic that has stopped moving
Different surfaces, different methods
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod.
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. We prime where the sealant needs it before sealing.
External mastic in Lake
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it, and we don’t skip that step. We work on façade panels, render & cladding joints and joints between brick and frames, and common reasons people get in touch are moss and dirt in joints with no sealant left and failed seals between different materials.
Around Lake, garages, outbuildings and extensions all add to the joints on the outside of a home. Leaks usually start at a gutter end, a garage door frame or where an extension meets the house.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Place
- Lake (PO36, PO37)
- Wider area
- Isle of Wight
- Guarantee
- A year, on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
If you are 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.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
What happens if it’s left?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. In an older home around Lake, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
What you pay reflects the work, not guesswork. That is why we ask a few questions first and give you a clear price before we start.
Why choose Mr Mastic in Lake
- Any old sealant cut out fully, not covered over
- 4.9 on Google from 180+ five-star reviews
- More than 20 years in sealant work
- Homes, businesses and hotels
Read what affects the cost or our reviews.
Your questions about external mastic in Lake
Can you help a landlord with a rental near Lake station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before any work starts.
Is external mastic in a coastal place like Lake any different?
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.
Can you seal joints between render and window frames?
Yes. Joints between dissimilar materials are a big part of external work. We use a flexible sealant suited to both surfaces.
When is the sealant fully cured?
Cure times vary by product. We tell you how long to leave it before we go.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before resealing.
Should I point up the gap in my brickwork?
No. Rigid materials cannot move with the wall and the joint fails. If it has already been filled, we can normally cut it out and reseal it.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Is there any odour?
There can be a smell while the sealant cures. Ventilation helps.
How we quote for external mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- How much there is to do
- Working hours on commercial sites
- The old material and how stubborn it is
- The product the joint needs
Some things make a job bigger or smaller: 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 to tell us for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Pictures of the joints, sent by email
- If it’s domestic, commercial or a hotel
- What’s wrong with the joints now
- Whether it has been sealed before
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.
Walls and rooflines in Lake
Lake is within about 1 mile of 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. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you let a flat or house near Lake station, split movement joints are easy to miss on a rental until damp shows inside. In the older streets around Church of The Good Shepherd, an extension built onto an older house moves differently, and the joint between them takes the strain. If you look after a building such as Broadlea Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Lake is about 1 mile south-west of Sandown, in the Isle of Wight. From the centre of Lake to the outskirts, external mastic is available for homes and businesses alike. Lake is one of 125 towns and villages in the Isle of Wight where we work for external mastic. Our Portsmouth page covers work nearby, about 12 miles away.
Every address in PO36 and PO37 is within our area for external mastic. Local streets include Lea Road, New Road and Percy Road, all of which we cover. You will find Lake on the A3055, which makes it straightforward to reach. We also cover Sandown (1 mile north-east), Alverstone (1 mile north-west), Queen's Bower (1 mile north-west), Shanklin (1 mile south) and Alverstone Garden Village (1 mile north-west). We also work in nearby towns such as Newport (7 miles north-west), Ryde (5 miles north), Cowes (10 miles north-west), Ventnor (4 miles south-west), East Cowes (9 miles north-west) and Oakfield (5 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 Lake
Locally, jobs take us to homes and businesses close to Sandown Bay Academy, The Old Comical pub and The Bay Church of England School, among other places. Lake has its own railway station: Lake station. A little further out are National Poo Museum (within half a mile east) and Arthur Webster Memorial Hospital for Children (1.2 miles south-west). Open spaces near Lake include Brading Down and Alverstone Mead.
Nearby places to Lake
Also in Lake
When it isn’t the sealant
To be straight with you, some problems need a different trade:
- Failed render or damaged cladding panels
- Rising or penetrating damp from elsewhere in the wall
- Cutting new joints into brickwork, which is building work rather than sealant work
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think.
Where we work in Lake
- Copings & trims
- Façade panels
- Brickwork movement joints
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
How the visit works
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes a few hours for a handful of joints, longer for a whole elevation. In a smaller place like Lake, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Mention any tricky access
- Let us know about parking restrictions
Get a quote
Every job is quoted individually, so the first step is telling us about yours. Just call 0345 464 0079 or send us an email with the details and send pictures if you have them.
Advice
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
For anyone letting property in or around Lake, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.