West Sussex · England
External & façade joints in Clapham, West Sussex
Specialist external mastic for Clapham: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Brick movement joints where the sealant has split
- Joints where the bead has come unstuck
- Failed sealant between panels on a façade
External mastic in Clapham
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a matching colour. We work on joints between brick and frames, render & cladding joints and concrete & block, and the jobs we see most are old sealant gone brittle and cracked and cracked joints where brick meets render or frames.
Somewhere as small as Clapham, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
Each job carries a 12-month guarantee.
- Where
- Clapham (BN13)
- Wider area
- West Sussex
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Clapham: your questions answered
Is Clapham within the area you cover?
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.
Is Clapham in your area for external mastic?
Yes. We work across London and the South East, and Clapham is part of that. You can call 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear price.
Do you seal joints where cladding meets other materials?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.
What do you put in the joint?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we’ll explain our choice.
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.
Do you remove the old sealant?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
Where are you based?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
Surface by surface
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. A primer goes on where the product requires one.
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joints work hard every day. We choose the product to suit.
Should I try it myself first?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
What happens on the day
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. After a quick look at the joints together, the area is protected and the work begins. Most jobs take a few hours for a handful of joints, longer for a whole elevation. Somewhere like Clapham needs a little journey planning: 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.
- 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.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- For business premises, tell us about site rules or sign-in
- Tell us if parking is tricky
Get a quote
We do not publish a price list. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or send us an email.
Read more
Outside joints around Clapham
With historic houses such as Ecclesden Manor (about 1.5 miles south-west) nearby, there’s older building stock in the area around Clapham as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. 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.
Rented homes near Goring-By-Sea station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as The Parish Church of St Mary, an extension built onto an older house moves differently, and the joint between them takes the strain.
Clapham is about 3 miles north-west of Worthing, in West Sussex. We carry out external mastic for homeowners, landlords and businesses in Clapham and the surrounding area, as part of our work across West Sussex. Clapham is one of 371 places in West Sussex where we work. Brighton is on our list too, around 14 miles away.
Jobs for external mastic in BN13 is quoted and booked the same way as anywhere else. External mastic is available to properties on The Street, Long Furlong and Church Close and the roads around them. Clapham is on the A280, so it’s easy for us to get to. Close by, we work in Patching (1 mile north-west), Cote (1 mile east), Hammerpot (2 miles west), Durrington (2 miles south-east) and Hangleton (2 miles south). Within a short drive, we also cover Worthing (3 miles south-east), Bognor Regis (11 miles west), Chichester (14 miles west), Littlehampton (4 miles south-west), Shoreham-by-Sea (8 miles east) and Lancing (6 miles east).
Landmarks near Clapham
In Clapham, that means homes and buildings near Clapham Wood, The Fox pub and Chatsmore Catholic High School, among other places. For rail, the closest station is Goring-By-Sea station, roughly 2.1 miles south of the centre. Well-known places in the area include Museum of Sussex Folklore (2.9 miles south-east) and Old Castle (2.9 miles south-east). Green spaces nearby include WWT Arundel and Highdown Hill.
How we quote for external mastic
There’s no set price list. The quote depends on:
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
- Access and height
- The product the joint needs
Doing several joints on one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Helping us quote
To make quoting easier, let us know:
- Any previous sealing or DIY work
- How we’d reach the joints
- What’s wrong with the joints now
- The address or postcode of the job
We quote each job on its own, so start by telling us what you need. Simply call 0345 464 0079 or email us and describe the job, and photos are welcome.
Landlord and commercial work in Clapham
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can go on one quote.
Letting agents often deal with us directly. Tell us the address, the job and how access works.
Signs you need external mastic in Clapham
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it can’t stretch and rips as the joint opens.
Look out for these signs:
- Panel joints letting water in
- Joints pointed up with cement by mistake
- Failed seals between different materials
- Brick movement joints where the sealant has split
Managing a site like Clapham and Patching CofE Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- How hidden problems are handled
- How the colour is chosen
- Which sealant they’ll use, and why
- How the joint is cleaned and prepared
More services for Clapham
When something else is needed
We’d rather tell you now than do work that will not last, so these are the limits:
- Adding movement joints to masonry that has none
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracking across the wall rather than at a joint
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before booking.
Where we work in Clapham
- Joints between brick and frames
- Copings & trims
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Façade panels