West Sussex · England
External & façade joints in Henfield, West Sussex
Professional external mastic in and around Henfield, with every bit of old sealant taken out first and a 12-month guarantee.
- Failed sealant between panels on a façade
- Failed seals between different materials
- Sealant pulling away from one side of the joint
Walls and rooflines in Henfield
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.
For site and facilities teams at buildings such as St Peter's CofE Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Henfield is about 7 miles north of Shoreham-by-Sea, in West Sussex. If you need external mastic in Henfield, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We cover West Sussex from our Crawley base. Henfield is one of 371 towns and villages in West Sussex where we work for external mastic. You can also see our page for Brighton, about 9 miles away.
All of BN5 is covered for external mastic, from the main roads to the quietest streets. If you need external mastic at a property on Upper Station Road, High Street and Lower Station Road or anywhere close by, we can help. Other places close to Henfield include Woodmancote (2 miles south-east), Blackstone (2 miles east), Small Dole (2 miles south), Shermanbury (2 miles north) and High Cross (3 miles east). We also work in nearby towns such as Crawley (13 miles north), Horsham (9 miles north), Worthing (9 miles south-west), Haywards Heath (9 miles north-east), Burgess Hill (7 miles east) and Littlehampton (14 miles south-west).
Local landmarks in Henfield
In Henfield, that means homes and buildings near The Bell Inn. Well-known places in the area include The Dene Hospital (5.4 miles north-east) and Steyning Museum (3.7 miles south-west). Green spaces nearby include Woods Mill and Truleigh Hill.
How we handle external mastic in Henfield
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. If you have rigid filler in a joint that should flex and leaking joints around cladding and façade panels, we can help, whatever the surface.
In and around Henfield, older properties sit alongside newer ones, each with its own outside joints. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
There’s a 12-month guarantee on every job.
- Location
- Henfield (BN5)
- Region
- West Sussex
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Also in Henfield
Henfield: your questions answered
Is external mastic in Henfield guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Do you cover smaller places like Henfield?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
How long will you be here?
That depends on the amount of work, but most jobs take a few hours for a handful of joints, longer for a whole elevation. We will give you a better idea when we quote.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
I’m a tenant. Can you help?
Yes, but check with your landlord or agent first. Landlords are often happy for the work to be arranged.
Can you seal over the old sealant?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
Where are you based?
We are based in Crawley, and we cover South East England, London and all of Scotland.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Look over the joints every year, ideally after winter
- Check the sealant is paintable before painting near it
- Wash walls gently around the sealant
- Tell anyone working on the walls about the movement joints
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
A joint that has stopped moving pushes the movement elsewhere, usually as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
How the job changes by surface
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.
Render joints
Cracks along render joints let water in behind the coat. A sound joint keeps the render dry behind and protects the render itself.
What happens on the day
There’s no need to move everything out, only the area right around the joints. Everything nearby is protected, and the job takes a few hours to a few days, depending on the length of joint and the access in most cases. For a job in Henfield, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- 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.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- Let us know about stairs, lifts or work at height
- Let us know about parking restrictions
Ask for a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or send us an email.
Advice
Quotes for external mastic in Henfield
You will get a clear quote before any work starts. It takes into account:
- The product the joint needs
- Whether there’s mould to deal with
- Whether old sealant or filler has to be cut out
- The number of rooms or windows
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and agree the price before starting.
Asking for a quote
Photos help, but a description is a good start. Please mention:
- If it’s domestic, commercial or a hotel
- Pictures of the joints, sent by email
- The rough size of the job
- Where the job is, and your postcode
To get a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We’ll give you a clear price before any work starts.
For landlords and businesses
We also work for property managers and facilities teams. We can quote a run of properties together.
Letting agents often deal with us directly. Tell us the address, the job and how access works.
DIY sealant or a professional job?
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.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Common problems we fix in Henfield
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Common reasons people contact us are:
- Cracked joints where brick meets render or frames
- Sealant that has lost its bond to the brick or render
- Weeds or debris growing in open joints
- Weathered mastic that no longer stretches
Homes close to St Peter's Church include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What your quote should include
- How the surfaces are prepared before sealing
- What happens if they find a problem under the old sealant
- Whether VAT is included
- Whether the sealant suits the joint