West Sussex · England
External & façade joints in Danehill, West Sussex
External mastic in Danehill from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Sealant that has lost its bond to the brick or render
- Movement joints with cracked, split or missing sealant
- Hard, crazed mastic that has stopped moving
External mastic for homes and businesses in Danehill
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. Common call-outs are for leaking joints around cladding and façade panels and moss and dirt in joints with no sealant left, on render & cladding joints, copings & trims and concrete & block.
Around Danehill, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Danehill (RH17)
- Region
- West Sussex
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Looking after it afterwards
Simple care keeps the joints in good condition. Our advice:
- Ask before painting over external sealant
- Fix overflowing gutters above sealed joints
- Look over the joints every year, ideally after winter
- Have failed joints looked at early
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
Nearby places to Danehill
Also in Danehill
What the job involves on each surface
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
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.
What affects the cost of external mastic
We quote each job individually. This is what makes a difference:
- Which sealant suits the joint
- How many rooms, windows or areas are involved
- Any working-time requirements on site
- The size of the job
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part.
What we need to know
Photos help, but a description is a good start. Please mention:
- If it’s domestic, commercial or a hotel
- A few pictures by email, if you can
- Any access issues, like height or stairs
- What’s wrong with the joints now
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. Whenever you’re ready, call 0345 464 0079 or send us an email.
Danehill: your questions answered
Is Danehill within the area you cover?
Yes. Danehill is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I let a flat near Haywards Heath station. Can you help?
Yes, we work for landlords and agents. You can phone 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Should I point up the gap in my brickwork?
No. Cement or mortar can’t stretch, so the joint stops doing its job. Where a joint has been mortared, it can often be raked out and sealed properly.
How long does the job take?
It depends on the size of the job, but most jobs take a few hours to a few days, depending on the length of joint and the access. We will give you a better idea when we quote.
How long before the joint can be used?
It depends on the product. We tell you how long to leave it before we go.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
What information do you need?
A short description and the location, with photos by email if possible. We will ask anything else we need to know.
What sealant do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Outside joints around Danehill
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. Historic houses like Priest House (about 4 miles north-west) are a reminder that the area around Danehill has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
In the older streets around The Parish Church of All Saints, old and new materials meet at the roofline and walls, which is where sealant earns its keep. If you let a flat or house near Haywards Heath station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Danehill is about 5 miles north-east of Haywards Heath, in West Sussex. Wherever you are in the RH17 postcode area, we cover external mastic for homes and businesses. Danehill is one of 371 towns and villages in West Sussex where we work. You can also see our page for Crawley, roughly 10 miles from Danehill.
All of RH17 is covered for external mastic. That includes homes and businesses on London Road, Lewes Road and Oaktree Cottages and the roads around them. Other places close to Danehill include Chelwood Common (1 mile north-east), Furner's Green (1 mile south), Horsted Keynes (1 mile west), Birchgrove (1 mile north) and Chelwood Gate (2 miles north-east). Larger places within reach include Crawley (10 miles north-west), Horsham (14 miles west), Haywards Heath (5 miles south-west), Burgess Hill (8 miles south-west), East Grinstead (7 miles north) and Broadfield (10 miles north-west).
Near you in Danehill
The closest station to Danehill is Haywards Heath station, about 5 miles west. Well-known places in the area include Waterbury Castle (1.7 miles west) and Princess Royal Hospital (4.8 miles south-west). Not far away are Brickfield Meadow.
What happens on the day
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes anything from a few hours to several days, depending on the building. For a village or hamlet like Danehill, the journey is planned in advance: 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.
- 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.
Preparing for the visit
- Let us know about earlier repairs to the joints
- Tell us about access, such as stairs, a lift or high-level joints
- Keep children and pets away from the work area
How to get a quote
Want a quote for external mastic? Please ring 0345 464 0079 or email us with a few details. We will explain what we’d do and send you a clear quote before work begins.
Advice
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in Danehill and across West Sussex. Several sites can be quoted together, and we are fully insured for the work.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
What happens if it’s left?
Running new sealant over the old bead rarely lasts. The new layer can’t bond properly to old, weathered material, so the old joint is cut out fully first. Around Danehill, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Why book with us
- Homes, businesses and hotels
- Every job guaranteed for a year
- We leave the area clean and tidy
- Over 20 years’ experience
Take a look at what affects the cost and what customers say.
When to call us in Danehill
If plants are growing out of a joint, the sealant has usually failed or was never there. Dirt and roots then trap moisture in the joint and speed up the damage.
Look out for these signs:
- Old sealant gone brittle and cracked
- Gaps where render, brick and frames meet
- Joints pointed up with cement by mistake
- Sealant pulling away from one side of the joint
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.
What to look for in a quote
- The length of the guarantee
- What preparation is included
- What the cure time is
- What happens if the job turns out different