Isle of Wight · England
External Mastic in Niton
Problem with your movement joints in Niton? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Brick movement joints where the sealant has split
- Rain getting behind render or cladding at a joint
- Weeds or debris growing in open joints
External mastic in Niton: local notes
Niton is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on movement joints and outside wall joints, especially on the side facing the sea. Historic houses like Wolverton Manor (about 4.9 miles north-west) are a reminder that the area around Niton has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Managing a site like Niton Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Niton is about 8 miles south of Newport, in the Isle of Wight. We provide external mastic to householders, landlords and businesses in Niton and nearby, as part of our work across the Isle of Wight. Niton is one of 125 places in the Isle of Wight where we work for external mastic. You can also see our page for Portsmouth, about 18 miles away.
Work in PO38 is quoted and booked the same way as anywhere else. Streets in the area include Puckwell Lane, School Lane and Church Street, and we cover them all. Neighbouring places we cover for external mastic include Puckaster (1 mile south), Bierley (1 mile north), Blackgang (1 mile west), Whitwell (1 mile north-east) and Southford (1 mile north). Within a short drive, we also cover Newport (8 miles north), Ryde (11 miles north-east), Cowes (12 miles north), Sandown (7 miles north-east), Shanklin (6 miles north-east) and Ventnor (3 miles east). Remote and island addresses need a little more planning, so tell us where you are when you ask for a quote.
Near you in Niton
We work in homes and buildings around White Lion pub. Well-known places in the area include Blackgang Sawmill Museum (1.3 miles west) and Arthur Webster Memorial Hospital for Children (5.6 miles north-east). The countryside around Niton includes Stenbury Down.
External mastic for homes and businesses in Niton
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We take the old material out and do it properly. We work on façade panels, joints between brick and frames and copings & trims, and people most often call us about plants rooting in failed movement joints and weathered mastic that no longer stretches.
Somewhere as small as Niton, 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.
Big or small, you get the same 12-month guarantee.
- Where
- Niton (PO38)
- Wider area
- Isle of Wight
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
For landlords and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works.
If you manage several properties in or around Niton, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and pictures by email help.
What we’re called out for in Niton
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it can’t stretch and tears as soon as the joint widens.
Most people get in touch when they notice something like this:
- Hard, crazed mastic that has stopped moving
- Failed sealant between panels on a façade
- Joints with sealant missing in places
- Moss and dirt in joints with no sealant left
If you live in an older home near Church of St. John the Baptist, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Comparing quotes
- What guarantee comes with the work
- Whether all the old sealant comes out first
- When the joint can take water or movement
- Are they insured?
DIY versus a professional finish
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Questions from Niton
Do you cover smaller places like Niton?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you do external mastic in Niton?
Yes, Niton is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear quote.
Can you seal over the old sealant?
No. New silicone won’t bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Is it OK to fill a movement joint with cement?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose, and the wall may crack nearby. We’ll reseal it with a flexible sealant.
Do you seal joints where cladding meets other materials?
Yes. Where different materials meet is one of the most common joints we seal. We use a flexible sealant suited to both surfaces.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Are you ARBOMaster approved?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
How it works
We keep the work tidy and contained to the joints we are 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, and we tell you how long to leave it before we go. In a small place like Niton, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Let us know about parking restrictions
- Let us know about stairs, lifts or work at height
Getting a quote
If you are in Niton and need external mastic, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
Related advice
When it isn’t the sealant
New sealant cannot fix everything, and we’d rather say so up front. Sealant will not put right:
- Subsidence or other structural problems
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly before booking.
What we seal
- Façade panels
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Brickwork movement joints
What else we do in Niton
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Look over the joints every year, ideally after winter
- Keep soil, plants and ivy away from the joints
- Make sure movement joints aren’t pointed over
- Keep high-pressure jets off the joints
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick.
Quotes for external mastic in Niton
There’s no set price list. What we look at:
- How much old sealant there is and how hard it is to remove
- Working hours on commercial sites
- Any mould that needs treating
- Whether the work is at height
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or drop us an email and we will talk you through it.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- If it’s domestic, commercial or a hotel
- Pictures of the joints, sent by email
- Any access issues, like height or stairs
- The address or postcode of the job
Getting a quote is simple: tell us what needs doing and where. A few pictures by email make the job easier to understand.