West Sussex · England
External & façade joints in Chelwood Common, West Sussex
Professional external mastic in and around Chelwood Common, with old sealant always removed completely and a 12-month guarantee.
- Sealant pulling away from one side of the joint
- Water getting into walls through failed joints
- Weeds or debris growing in open joints
Can I do it myself?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
External mastic for homes and businesses in Chelwood Common
Low-level joints can generally be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we’ll confirm what’s needed to reach them safely. We work on render & cladding joints, concrete & block and copings & trims, and people most often call us about failed seals between different materials and failed sealant between panels on a façade.
External sealant needs dry, clean surfaces, so work around Chelwood Common is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
You get a 12-month guarantee, the same in Chelwood Common as everywhere else we work.
- Where
- Chelwood Common (RH17)
- Wider area
- West Sussex
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Places near Chelwood Common
Other services in Chelwood Common
Walls and rooflines in Chelwood Common
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Priest House (about 3.9 miles north-west) nearby, there’s older building stock in the area around Chelwood Common as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
If you look after a building such as Danehill Church of England Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. In the older streets around Chelwood Gate Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Chelwood Common is about 6 miles north-east of Haywards Heath, in West Sussex. Whether you are in the middle of Chelwood Common or further out, we cover external mastic for every kind of property. Our West Sussex coverage runs to 371 places, Chelwood Common among them. For nearby work, see our Crawley page, about 10 miles away.
Jobs for external mastic in RH17 is quoted and booked the same way as anywhere else. If you need external mastic at a property on Baxters Lane, Tanyard Lane and Box's Lane or a nearby road, our applicators can take on the job. Neighbouring places we cover for external mastic include Chelwood Gate (1 mile north), Danehill (1 mile south-west), Birchgrove (1 mile north-west), Furner's Green (2 miles south) and Nutley (2 miles east). Within a short drive, we also cover Crawley (10 miles north-west), Horsham (15 miles west), Haywards Heath (6 miles south-west), Burgess Hill (9 miles south-west), East Grinstead (6 miles north) and Broadfield (10 miles west).
Local landmarks in Chelwood Common
A little further out are Waterbury Castle (2.3 miles west) and Heaven Farm Museum (1.6 miles south). Open spaces near Chelwood Common include Brickfield Meadow.
What we can’t put right
In fairness, some problems need a different trade:
- Movement that’s more than a sealant joint can take
- Cracks in the bricks or render themselves, away from the joints
- Walls that need new movement joints cut into them
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer.
Surfaces we seal
- Façade panels
- Concrete & block
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Render & cladding joints
How it works
When we get to you, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes anything from a few hours to several days, depending on the building. Somewhere like Chelwood Common 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.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Try not to wet indoor joints just before the visit
- Mention if the joints have been sealed before
- Let us know if you’ve seen damp or leaks
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, ring 0345 464 0079 or drop us an email.
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What the job involves on each surface
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it or an approved alternative. Tell us what the building has when you get in touch.
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that’s happened, we rake it out and reseal it properly if the joint can be cleared.
Why act early in Chelwood Common
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. Around Chelwood Common, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts, so you know where you stand.
What you get with us
- Anti-fungal silicone where joints get wet
- Homes, businesses and hotels
- We never seal over old sealant
- Fully insured
Keeping the joints in good condition
So the new joints stay in good condition:
- Avoid pressure-washing directly into sealant joints
- Check the sealant is paintable before painting near it
- Never let anyone fill a movement joint with mortar
- Get split or bare joints resealed while the damage is small
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
Landlords, agents and businesses in Chelwood Common
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Chelwood Common: your questions answered
Can you do external mastic in Chelwood Common?
Yes. Our work covers London and the South East, and Chelwood Common is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Is Chelwood Common within the area you cover?
Yes. Chelwood Common is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
What colours does the sealant come in?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so it doesn’t stand out.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
Do the sealants smell?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Do you work at height?
Each building is different. Tell us the height, the number of joints and what’s below them.