West Sussex · England
Heyshott External Mastic
External mastic across Heyshott and nearby, with old sealant always removed completely and a 12-month guarantee.
- Movement joints with cracked, split or missing sealant
- Rigid filler in a joint that should flex
- Old sealant gone brittle and cracked
External mastic for homes and businesses in Heyshott
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 and we use one wherever it does. We work on render & cladding joints, joints between brick and frames and copings & trims, and people most often call us about rigid filler in a joint that should flex and moss and dirt in joints with no sealant left.
External sealant needs dry, clean surfaces, so work around Heyshott 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 Heyshott as everywhere else we work.
- Place
- Heyshott (GU29)
- Wider area
- West Sussex
- Guarantee
- One year on every job
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
Simple care keeps the joints in good condition. We recommend:
- Ask before painting over external sealant
- Walk round the building once a year and look at the joints
- Act on the first splits you see
- Keep high-pressure jets off the joints
Avoid pressure-washing straight into the joints. A strong jet can damage the edges of the bead and let water in behind.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years, so it’s worth resealing at the first signs.
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
Different surfaces, different methods
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
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.
Your questions about external mastic in Heyshott
Do you cover Heyshott for external mastic?
Yes. We work across London and the South East, and Heyshott is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
Do you cover smaller places like Heyshott?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Where do you work from?
We work from Crawley. Our applicators cover Heyshott, along with the rest of our area.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We’ll tell you how long to leave the joint.
Will the new joint stand out?
We choose a sealant colour to suit the brick, stone or render so the joint blends in. There’s a wide choice of exterior colours.
Can landlords and businesses book you?
Yes, regularly. Several properties can go on one quote.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
Why it’s worth doing now in Heyshott
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. In a small place like Heyshott, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Why us?
- Neat joints and a tidy finish
- Full insurance on every job
- Old sealant always removed completely
- Trusted Arbo and Everbuild sealants
Take a look at our cost guide and what customers say.
External mastic in Heyshott: local notes
With historic houses such as Cowdray House (about 2.5 miles north) nearby, there’s older building stock in the area around Heyshott as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near The Parish Church of St James, an extension built onto an older house moves differently, and the joint between them takes the strain.
Heyshott is about 8 miles north of Chichester, in West Sussex. Every kind of property in Heyshott can book us for external mastic. The work is guaranteed for a year. Heyshott is one of 371 towns and villages in West Sussex we cover for external mastic. There’s also a page for Portsmouth, roughly 19 miles from Heyshott.
All of GU29 is within our area for external mastic, from the main roads to the quietest streets. Nearby, we also carry out external mastic in Hoyle (1 mile north-east), Heyshott Green (1 mile north-west), Cocking (1 mile west), Cocking Causeway (2 miles north-west) and West Lavington (2 miles north). Larger places within reach include Bognor Regis (11 miles south), Chichester (8 miles south), Selsey (15 miles south), Littlehampton (13 miles south-east), Emsworth (12 miles south-west) and Rustington (13 miles south-east).
Landmarks near Heyshott
In Heyshott, that means homes and buildings near Unicorn Inn and the streets around them. Other landmarks nearby include Lodsworth Castle (2.8 miles north-east) and Midhurst Community Hospital (2.9 miles north). The countryside around Heyshott includes Graffham Common and Levin Down.
Towns and villages near Heyshott
What else we do in Heyshott
How it works
When we arrive, we look over the joints with you first. We protect the surfaces around the joints before we start. The work generally takes a few hours for a handful of joints, longer for a whole elevation. Somewhere like Heyshott needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Keep pets and children clear of the area while we work
- Mention any tricky access
- Tell us if parking is tricky
How to get a quote
Every job is quoted individually. Simply phone 0345 464 0079 or send us an email and describe the job, and pictures are welcome.
Read more
Common problems we fix in Heyshott
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
The problems people normally mention when they call are:
- Rain getting behind render or cladding at a joint
- Plants rooting in failed movement joints
- Movement joints filled with mortar instead of sealant
- Sealant that has lost its bond to the brick or render
Around Heyshott, as everywhere, external mastic is only as good as the preparation behind it.
What your quote should include
- Is VAT in the price?
- What guarantee comes with the work
- Who turns up on the day
- How hidden problems are handled
What we can’t put right
Before booking, it’s worth knowing the limits too:
- Walls that need new movement joints cut into them
- Cracking across the wall rather than at a joint
- Movement that’s more than a sealant joint can take
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think.
Joints and surfaces we work on
- Copings & trims
- Render & cladding joints
- Façade panels
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints