West Sussex · England
External & façade joints in Halnaker, West Sussex
Movement joints in Halnaker need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Failed sealant between panels on a façade
- Moss and dirt in joints with no sealant left
- Joints pointed up with cement by mistake
Surface by surface
Cladding and façade panels
Cladding and façade panels are normally separated by sealed joints. Each joint gets a sealant that suits the panel and its movement.
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible year round.
How we handle external mastic in Halnaker
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two where mortar or filler would crack. We work on brickwork movement joints, façade panels and joints between brick and frames, and people most often call us about panel joints letting water in and weeds or debris growing in open joints.
Somewhere as small as Halnaker, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Halnaker (PO18)
- Region
- West Sussex
- Guarantee
- A year, on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Leave it or put it right?
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost around the joint, so the problem grows beyond the joint itself. Older cottages and farmhouses around Halnaker can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why us?
- Any old sealant cut out fully, not covered over
- Domestic, commercial and hotel work
- Colour agreed with you before any work starts
- Tidy, careful work
DIY sealant or a professional job?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Halnaker buildings and the weather
Historic houses like Goodwood House (about 1.4 miles west) are a reminder that the area around Halnaker has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. 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.
Letting a property close to Chichester station? Then outside joints that have cracked can let damp into a rental, so check them between lets. In the older streets around The Priory Church of St Mary and St Blaize, an extension built onto an older house moves differently, and the joint between them takes the strain. Schools such as Boxgrove CofE Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Halnaker is about 3 miles north-east of Chichester, in West Sussex. Anywhere in PO18, we can carry out external mastic at your property. Halnaker is one of 371 places in West Sussex where we work for external mastic. There’s also a page for Portsmouth, roughly 16 miles from Halnaker.
We cover every part of PO18 for external mastic and the streets around it. Whether your property is on The Street, Stame Road and Oakford Park or a nearby road, our applicators can take on the job. Other places close to Halnaker include Boxgrove (1 mile south), Waterbeach (1 mile west), Tangmere (1 mile south), Strettington (1 mile south-west) and Westerton (1 mile west). We also work in nearby towns such as Worthing (14 miles east), Bognor Regis (5 miles south), Chichester (3 miles south-west), Selsey (10 miles south), Littlehampton (9 miles south-east) and Emsworth (10 miles west).
Local landmarks in Halnaker
The closest station to Halnaker is Chichester station, roughly 3.8 miles south-west. A little further out are Chichester Centre (2.9 miles south-west) and The Chichester City Museum (3.4 miles south-west). For a walk, there’s Levin Down.
FAQs for Halnaker
Can you do external mastic in Halnaker?
Yes. Our work covers London and the South East, and Halnaker is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we will give you a clear price.
I let a flat near Chichester station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear price.
Can you match the colour of my brickwork?
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.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
Can you seal joints between render and window frames?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides with primer where required.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year.
How do I get a quote for external mastic in Halnaker?
Every job is different, so each one gets its own quote. To get one, call 0345 464 0079 or send us an email and let us know what needs doing and where.
For landlords and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Towns and villages near Halnaker
Other services in Halnaker
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Have failed joints looked at early
- Deal with leaking gutters that soak the joints below
- Leave the joints unpainted unless we’ve said otherwise
- Point out the joints to other trades
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
When something else is needed
Before you book, it’s worth knowing the limits too:
- Cracks in the bricks or render themselves, away from the joints
- Subsidence or other structural problems
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
What we seal
- Concrete & block
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
What happens on the day
You don’t need to clear the whole room or building, only the area right around the joints. We protect the rest, and the work takes a few hours for a handful of joints, longer for a whole elevation in most cases. In a small place like Halnaker, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Mention any leaks or damp you’ve noticed
- Keep children and pets away from the work area
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.