Isle of Wight · England
Thorncross External Mastic
Specialist external mastic for Thorncross: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Rigid filler in a joint that should flex
- Damp patches traced to an open external joint
- Hard, crazed mastic that has stopped moving
External mastic in Thorncross, done properly
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing, and we don’t skip that step. If you have weathered mastic that no longer stretches and gaps where render, brick and frames meet, we can help, whatever the surface.
Around Thorncross, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water generally gets in, and they need the right sealant at the right depth.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Thorncross (PO30)
- Region
- Isle of Wight
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Leave it or put it right?
A failed movement joint lets water into the wall, behind render and cladding. Dealing with it early keeps the repair to the joint, instead of the wall and finishes around it. In a small place like Thorncross, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and give you a clear price before any work starts.
Why us?
- Trusted Arbo and Everbuild sealants
- Fully insured
- Colour picked to suit the job
- A 12-month guarantee on all work
See our cost guide or what customers say.
Keeping the joints in good condition
So the new joints stay in good condition:
- Point out the joints to other trades
- Clear growth from the base of walls and joints
- Never let anyone fill a movement joint with mortar
- Leave the joints unpainted unless we have said otherwise
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
What happens on the day
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, carry out the job and clear up. Most jobs take a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Thorncross, 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.
- Old sealant and any debris are cut and raked out.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Keep children and pets away from the work area
- Move anything stored near the joints
- Let us know about parking restrictions
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Advice
How the job changes by surface
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best.
Joints between dissimilar materials
Different materials may need different primers. We prepare both faces so the sealant bonds properly.
Also near Thorncross
More services for Thorncross
Common questions in Thorncross
Is external mastic in a coastal place like Thorncross any different?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. Walls facing the sea are usually the first to need attention.
Is Thorncross within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you have insurance?
Yes. We’re fully insured, with over 20 years’ experience in sealant work.
Why is there a gap in my brick wall?
Walls move with heat, cold and moisture, so long walls have planned gaps to take that movement. It’s closed with backing rod and a flexible sealant.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Is it worth trying it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Do the sealants smell?
Some sealants have a smell while they cure. Opening a window helps.
Can tenants book the work?
Yes, but check with your landlord or agent first. Landlords are often happy for the work to be arranged.
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.
Thorncross buildings and the weather
Thorncross 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. That is hard on movement joints and outside wall joints, especially on the side facing the sea. 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.
Schools such as Brighstone Church of England Aided Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Thorncross is about 6 miles south-west of Newport, in the Isle of Wight. If you need external mastic in Thorncross, please phone 0345 464 0079 or send us an email for a quick quote. We cover the Isle of Wight from our Crawley base. Our area takes in 125 places across the Isle of Wight. Our Portsmouth page covers work nearby, about 18 miles away.
We cover every part of the PO30 postcode area for external mastic and the streets around it. Neighbouring places we cover for external mastic include Brighstone (1 mile north-west), Moortown (1 mile north-west), Shorwell (1 mile north-east), Little Atherfield (2 miles south-east) and Atherfield Green (2 miles south-east). Larger places within reach include Newport (6 miles north-east), Ryde (11 miles north-east), Cowes (9 miles north), Sandown (10 miles east), Shanklin (9 miles east) and Ventnor (8 miles east). If you are somewhere remote, the job takes a little more planning.
Local landmarks in Thorncross
Around Thorncross, our work takes us to homes and buildings near The Countryman pub, among other places. A little further out are Whitecroft Hospital (4.4 miles north-east) and The Dinosaur Farm Museum (0.5 miles south-east). The countryside around Thorncross includes Brighstone Down.
Quotes for external mastic in Thorncross
Every job gets its own quote. These are the things that affect it:
- The product the joint needs
- The number and length of the joints
- Any working-time requirements on site
- How easy the joints are to reach
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
What to tell us for a quote
There’s no need for technical detail. It helps if you can tell us:
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
- Pictures of the joints, sent by email
- If it’s domestic, commercial or a hotel
We quote each job on its own. Just phone 0345 464 0079 or drop us an email with the details, and photos are welcome.
Common problems we fix in Thorncross
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
Keep an eye out for any of the following:
- Joints pointed up with cement by mistake
- Movement joints with cracked, split or missing sealant
- Failed seals between different materials
- Failed sealant between panels on a façade
If you live in an older home near St. Mary's Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
What your quote should include
- What the cure time is
- How much experience the applicator has
- What preparation is included
- What happens if the job turns out different