West Sussex · England
External & façade joints in West Marden, West Sussex
External mastic for West Marden and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Sealant pulling away from one side of the joint
- Failed sealant between panels on a façade
- Weeds or debris growing in open joints
How to look after the new joints
After the cure time, these simple habits help:
- Keep water from gutters off the wall
- Avoid pressure-washing directly into sealant joints
- Don’t let climbing plants root in the sealant
- Act on the first splits you see
Do not paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants are not designed to be painted, and paint can crack as the joint moves.
Once a joint can’t move, the wall finds another way, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
About our external mastic in West Marden
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall so the line blends in. We work on brickwork movement joints, concrete & block and façade panels, and people most often call us about failed seals between different materials and hard, crazed mastic that has stopped moving.
Older homes in small places like West Marden may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water generally gets in.
You’re covered for a year from the day we finish. If there’s a problem with it, please call 0345 464 0079 or drop us an email.
- Where
- West Marden (PO18)
- Wider area
- West Sussex
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the cost of external mastic
The quote reflects the job in front of us. We look at:
- Mould in or behind the old joints
- The product the joint needs
- How much old sealant there is and how hard it is to remove
- The amount of work
The cost depends on how much there is to do, how much old material has to come out and access to the work. You will have a clear quote before any work starts, so you know where you stand.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Access, such as stairs, a lift or height
- The problem you’ve noticed
- The rough size of the job
- Where the property is
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we’ll take it from there.
Different surfaces, different methods
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. A primer goes on where the product requires one before the bead.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. Each joint gets a sealant that suits the panel and its movement.
Signs you need external mastic in West Marden
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
Keep an eye out for any of the following:
- Hard, crazed mastic that has stopped moving
- Sealant pulling away from one side of the joint
- Gaps where render, brick and frames meet
- Movement joints filled with mortar instead of sealant
For site and facilities teams at buildings such as Compton and Up Marden CofE Primary School, its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- What product goes in the joint
- How long to leave it before use
- How the surfaces are prepared before sealing
- Whether they seal over old material or remove it
External mastic in West Marden: local notes
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Uppark (about 2.6 miles north) nearby, there’s older building stock in the area around West Marden as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
For landlords with property near Rowlands Castle station, split movement joints are easy to miss on a rental until damp shows inside. In the older streets around The Parish Church of St Mary, older walls, gutters and the joints where extensions meet them need a flexible sealant.
West Marden is about 5 miles east of Horndean, in West Sussex. We provide external mastic to homes and businesses in West Marden and nearby, as part of our work across West Sussex. West Marden is one of 371 places in West Sussex where we work. You can also see our page for Portsmouth, about 11 miles away.
Our applicators cover all of the PO18 postcode area for external mastic. We also cover the places around West Marden: Forestside (1 mile south-west), Chalton (3 miles north-west), Blendworth (4 miles west), Buriton (5 miles north-west) and Nursted (5 miles north). Within a short drive, we also cover Bognor Regis (13 miles south-east), Chichester (8 miles south-east), Selsey (14 miles south), Emsworth (5 miles south), Portfield (8 miles south-east) and Yapton (14 miles south-east).
Local landmarks in West Marden
We work in homes and buildings around The Coach And Horses Public House, among other places. The nearest railway station is Rowlands Castle station, about 2.8 miles south-west. Nearby you’ll also find Havant War Memorial Hospital (5.6 miles south-west) and Clanfield Earthwork (4.1 miles north-west). For a walk, there’s Kingley Vale National Nature Reserve and Compton Down.
Nearby places to West Marden
What else we do in West Marden
Why it’s worth doing now in West Marden
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. Around West Marden, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
Why book with us
- Trusted Arbo and Everbuild sealants
- Domestic, commercial and hotel work
- We’re fully insured
- White, clear, grey or coloured to suit, where the product allows
Take a look at how sealant jobs are priced or our reviews.
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Common questions in West Marden
Is West Marden in your area for external mastic?
Yes. Our work covers London and the South East, and West Marden is part of that. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
Do you work for landlords with property near Rowlands Castle station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
What should I tell you?
A short description and the location. We will ask anything else we need to know.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Is it OK to fill a movement joint with cement?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
Will it make a mess?
Tidy work is part of the job. We protect what’s around the joints.
Do you have insurance?
Yes. We are fully insured.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
How it works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes anything from a few hours to several days, depending on the building. Somewhere like West Marden 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.
- 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.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Let us know about earlier repairs to the joints
- Let us know if you’ve seen damp or leaks
Get a quote
For external mastic in West Marden, ring 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.