West Sussex · England
External & façade joints in Cowfold, West Sussex
External mastic in Cowfold from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Rigid filler in a joint that should flex
- Hard, crazed mastic that has stopped moving
- Failed sealant between panels on a façade
What affects the cost of external mastic
There’s no set price list. The quote depends on:
- Any working-time requirements on site
- The old material and how stubborn it is
- Whether the work is at height
- Whether there’s mould to deal with
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Asking for a quote
When you call or email, it’s useful to know:
- The type of property
- A few pictures by email, if you can
- Access, such as stairs, a lift or height
- How many joints, rooms or windows are involved
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. Whenever you are ready, phone 0345 464 0079 or email us.
How we handle external mastic in Cowfold
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We take the old material out and do it properly. We work on copings & trims, joints between brick and frames and brickwork movement joints, and the jobs we see most are plants rooting in failed movement joints and joints with sealant missing in places.
Around Cowfold, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
Whatever the size of the job, you get the same one-year guarantee.
- Location
- Cowfold (RH13)
- Region
- West Sussex
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
Looking after new joints is easy:
- Deal with leaking gutters that soak the joints below
- Make sure movement joints are not pointed over
- Leave the joints unpainted unless we’ve said otherwise
- Check external joints each spring
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage.
When something else is needed
Before booking, it’s worth knowing the limits:
- Render that’s blown, hollow or coming away
- Damp that isn’t coming from the joint
- Movement that is more than a sealant joint can take
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think before you book.
What we seal
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Render & cladding joints
What happens if it’s left?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. Around Cowfold, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, call 0345 464 0079 or email us for an honest opinion and a quote.
Why us?
- Arbo and Everbuild products
- Anti-fungal silicone where joints get wet
- An ARBOMaster approved applicator
- Sealant colour chosen to suit
Read how sealant jobs are priced or our reviews.
Your questions about external mastic in Cowfold
Is Cowfold within the area you cover?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Is Cowfold in your area for external mastic?
Yes. We work across London and the South East, and Cowfold is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear price.
Can new sealant go over the old?
No, it won’t last. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Do you do commercial work?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Should I point up the gap in my brickwork?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
I’m a tenant. Can you help?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
Is it worth trying it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Do you remove the old sealant?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
DIY versus a professional finish
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Towns and villages near Cowfold
What else we do in Cowfold
Work for landlords, hotels and businesses
If you manage several properties in or around Cowfold, several properties can be quoted together. Just tell us the addresses and what each one needs, and pictures by email help.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
What we do, step by step
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes a few hours for a handful of joints, longer for a whole elevation. In a small place like Cowfold, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Clear items away from the joints we’re working on
- Let us know about parking restrictions
Ask for a quote
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, and add photos by email if you can.
Read more
Outside joints around Cowfold
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In the older streets around Church of St Peter, an extension built onto an older house moves differently, and the joint between them takes the strain. If you look after a building such as St Peter's CofE (Aided) Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Cowfold is about 6 miles south of Horsham, in West Sussex. For external mastic in and around Cowfold, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover West Sussex from our Crawley base. We cover 371 towns and villages across West Sussex. There’s also a page for Crawley, roughly 9 miles from Cowfold.
Every address in RH13 is within our area for external mastic. That includes homes and businesses on Oakfield Road, Acorn Avenue and Holm Oaks and the roads around them. If you are just outside Cowfold, we cover Kent Street (1 mile south-east), Wineham (2 miles south-east), Shermanbury (2 miles south), Crosspost (3 miles east) and Twineham Green (3 miles south-east). Further out, we also cover Crawley (9 miles north-east), Horsham (6 miles north), Worthing (13 miles south-west), Haywards Heath (8 miles east), Burgess Hill (7 miles east) and East Grinstead (15 miles north-east).
Around Cowfold
A little further out are The Dene Hospital (4.9 miles east). Green spaces nearby include Knepp Wildland.