Isle of Wight · England
External Mastic in Gurnard
External mastic for Gurnard and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Leaking joints around cladding and façade panels
- Rain getting behind render or cladding at a joint
- Failed seals between different materials
When to call us in Gurnard
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
The problems people usually mention when they call include:
- Gaps where render, brick and frames meet
- Sealant that has lost its bond to the brick or render
- Moss and dirt in joints with no sealant left
- Rigid filler in a joint that should flex
For an older house near a landmark such as All Saints' Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Comparing quotes
- Whether all the old sealant comes out first
- What guarantee comes with the work
- Whether they’re fully insured
- What happens if the job turns out different
External mastic in Gurnard
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. We work on façade panels, concrete & block and brickwork movement joints, and the jobs we see most are joints with sealant missing in places and joints pointed up with cement by mistake.
Older homes in small places like Gurnard may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water usually gets in.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Gurnard (PO31)
- Wider area
- Isle of Wight
- Cover
- A year, on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
The work is kept neat and contained to the joints we’re treating, so you can carry on as normal. Expect the work to take a few hours for a handful of joints, longer for a whole elevation. In a small place like Gurnard, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Mention if the joints have been sealed before
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
Every job is quoted individually, so start by telling us what you need. Simply ring 0345 464 0079 or drop us an email and describe the job and send pictures if you have them.
Related advice
Walls and rooflines in Gurnard
Gurnard is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you look after a building such as Gurnard Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Gurnard is about 1 mile west of Cowes, in the Isle of Wight. Gurnard gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. 125 places in the Isle of Wight are on our list, large and small. We also work in Portsmouth, about 11 miles from Gurnard.
Our applicators cover all of the PO31 postcode area for external mastic. If you need external mastic at a property on Cow Lane, The Avenue and Shore Road or a nearby road, our applicators can take on the job. We also cover the places around Gurnard: Cowes (1 mile east), Northwood (1 mile south), Rew Street (1 mile south-west), Great Thorness (2 miles south-west) and Noke Common (2 miles south). Larger places within reach include Newport (4 miles south), Ryde (7 miles east), Sandown (10 miles south-east), Shanklin (11 miles south-east), Ventnor (12 miles south-east) and Oakfield (8 miles east). For island and remote addresses, a little more planning is needed.
Near you in Gurnard
Locally, jobs take us to homes and businesses close to Cowes Enterprise College and The Portland Inn and the streets around them. Well-known places in the area include St Mary's Hospital (3.2 miles south) and Isle of Wight Natural History Centre (0.5 miles south-east). The countryside around Gurnard includes Mill Hill and Briddlesford Nature Reserve.
Nearby places to Gurnard
What else we do in Gurnard
How we quote for external mastic
Your quote is based on your job. We take into account:
- The old material and how stubborn it is
- Any mould that needs treating
- How many areas need sealing
- How easy the joints are to reach
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
What we need to know
You don’t need to know the technical terms. It helps if you can tell us:
- Roughly how big the job is
- Any access issues, like height or stairs
- Where the job is, and your postcode
- Whether it’s a home or a business
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Landlord and commercial work in Gurnard
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
How to look after the new joints
Looking after new joints is easy:
- Avoid pressure-washing directly into sealant joints
- Clear growth from the base of walls and joints
- Check the sealant is paintable before painting near it
- Show decorators and builders where the movement joints are
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
When it is not the sealant
We’d rather tell you now than do work that will not last, so these are the limits:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Render that’s blown, hollow or coming away
- Cracked brickwork or render that needs a builder or plasterer
If you are not sure, just call 0345 464 0079 or email us and we will give you a straight answer.
Where we work in Gurnard
- Façade panels
- Copings & trims
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
What happens if it’s left?
A failed movement joint lets water into the wall. Dealing with it early keeps the repair to the joint, instead of the wall and finishes around it. Older cottages and farmhouses around Gurnard can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
What you get with us
- We agree the colour with you first
- Approved under the ARBOMaster scheme
- White, clear, grey or coloured to suit, where the product allows
- Any old sealant cut out fully, not covered over
Read our cost guide or customer reviews.
FAQs for Gurnard
Does the coastal weather in Gurnard affect outside sealant?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Can you do external mastic in Gurnard?
Yes, Gurnard is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear quote.
Is it OK to seal over old sealant?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
What sealant do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Will the new joint stand out?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We pick the one that suits your wall best so the joint does not draw the eye.
How long does external mastic take?
That depends on the amount of work, but as a guide it takes anything from a few hours to several days, depending on the building. We will give you a better idea when we quote.
Is the work guaranteed?
Yes: twelve months. If anything is not right with the work within the year, let us know and we will sort it.
What is a movement joint?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.