West Sussex · England
Runcton External Mastic
External mastic across Runcton and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Failed sealant between panels on a façade
- Rain getting behind render or cladding at a joint
- Cracked joints where brick meets render or frames
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote.
External mastic in Runcton
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. Typical jobs include movement joints with cracked, split or missing sealant and failed seals between different materials, across concrete & block, render & cladding joints and joints between brick and frames.
Older homes in small places like Runcton may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
You get a one-year guarantee, the same in Runcton as everywhere else we work.
- Place
- Runcton (PO20)
- Wider area
- West Sussex
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Surface by surface
Render joints
Cracks along render joints let water in behind the coat. A sound joint keeps the render dry behind.
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. A primer goes on where the product requires one before the bead.
Runcton: your questions answered
Is external mastic in a coastal place like Runcton any different?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. The right product, a clean joint and the right depth all help it cope.
Can you help a landlord with a rental near Chichester station?
Yes, we work for landlords and agents. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before we start.
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.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used before we leave.
Will it make a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Do you come to Runcton?
Yes. We cover Runcton and the rest of West Sussex, as part of our work across South East England, London and Scotland. To book, phone 0345 464 0079 or send us an email.
Will the old sealant be removed?
Yes, always, and completely. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Can new sealant go over the old?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Places near Runcton
What else we do in Runcton
The process
All our tools and materials come with us in the van. After a quick look at the joints together, the area is protected and the work begins. 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 Runcton, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Clear the area around the work
- Let us know about parking restrictions
- For business premises, tell us about site rules or sign-in
Get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Show decorators and builders where the movement joints are
- Keep water from gutters off the wall
- Clear growth from the base of walls and joints
- Keep high-pressure jets off the joints
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years.
Outside joints around Runcton
Runcton is close to 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. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near The Parish Church of St Stephen, the joints between older walls, newer extensions and the roofline need a sealant that can move. If you look after a building such as North Mundham Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Letting a property close to Chichester station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Runcton is about 2 miles south-east of Chichester, in West Sussex. Wherever you are in the PO20 postcode area, we can carry out external mastic at your property. Our area takes in 371 places across West Sussex. Portsmouth is on our list too, about 14 miles from Runcton.
Here we cover the PO20 postcode area for external mastic. We cover properties on Goodwood Gardens, Brookside and Lagness Road. Other places close to Runcton include North Mundham (1 mile west), Merston (1 mile north-east), Lagness (1 mile south-east), Hunston (1 mile west) and Portfield (2 miles north). We also work in nearby towns such as Worthing (15 miles east), Bognor Regis (3 miles south-east), Selsey (6 miles south), Littlehampton (9 miles east), Emsworth (9 miles west) and Rustington (10 miles east).
Around Runcton
In Runcton, that means homes and buildings near Chichester High School For Girls. For rail, the closest station is Chichester station, roughly 1.9 miles north-west of the centre. Nearby you’ll also find Chichester Castle (2.1 miles north-west) and The Chichester City Museum (2 miles north-west).
Can I do it myself?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Why deal with it now?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. Older cottages and farmhouses around Runcton can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
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.
Why Runcton clients choose us
- Arbo and Everbuild products
- A sealant colour to suit the surroundings
- More than 20 years in sealant work
- Old sealant always removed completely
Take a look at how sealant jobs are priced and what customers say.
When it isn’t the sealant
To be straight with you, some problems need a different trade:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Structural movement, which needs a surveyor or engineer
- Damp that isn’t coming from the joint
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before you book.
Surfaces we seal
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
- Façade panels
- Concrete & block