West Sussex · England
Newtimber External Mastic
Our applicators work in Newtimber on sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
- Moss and dirt in joints with no sealant left
External mastic in Newtimber, done properly
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall. We are often asked to deal with sealant pulling away from one side of the joint and panel joints letting water in, across copings & trims, façade panels and render & cladding joints.
Outside joints can only be sealed when they’re dry, so work in Newtimber is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
There’s a 12-month guarantee on every job.
- Where
- Newtimber (BN6)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Work for landlords, hotels and businesses
If you manage several properties in or around Newtimber, jobs at different addresses can be quoted together. Send us the addresses and the work at each.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Why act early in Newtimber
Sealing over the top of old mastic does not hold for long. The new layer can’t bond properly to old, weathered material, so the old joint is cut out fully first. Around Newtimber, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
Why book with us
- You choose the colour before work begins
- Fully insured
- Any old sealant cut out fully, not covered over
- Quality sealants from Arbo and Everbuild
See what affects the cost and our reviews.
What we’re called out for in Newtimber
The wrong product in a moving joint is a classic cause. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Keep an eye out for any of the following:
- Movement joints filled with mortar instead of sealant
- Damp patches traced to an open external joint
- Weathered mastic that no longer stretches
- Panel joints letting water in
For an older house near a landmark such as The Parish Church of St John Evangelist, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Questions to ask before you book
- How the surfaces are prepared before sealing
- What insurance they hold
- Whether the sealant suits the joint
- How hidden problems are handled
Surface by surface
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. Priming is done where the sealant calls for it.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. We cut out the old sealant and reseal with a product suited to both surfaces.
Questions from Newtimber
Will you come out to Newtimber?
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.
I let a flat near Hassocks station. Can you help?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Do you use backing rod?
That’s backing rod, a closed-cell foam. It stops the sealant going in too deep and bonding to three sides so it can flex with the joint.
Do you seal joints where cladding meets other materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. The colour is chosen to suit.
Can you reach joints on upper floors?
It depends on the height and the site. Low-level joints are straightforward; for higher ones, send details and we will confirm the access.
Are you fully insured?
Yes. We’re fully insured.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
How long does external mastic last?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. Check them each year and reseal when they split or harden. Our work comes with a 12-month guarantee.
Walls and rooflines in Newtimber
With historic houses such as Portslade Manor (about 4.6 miles south) nearby, there’s older building stock in the area around Newtimber as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. 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.
Rented homes near Hassocks station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Newtimber is about 5 miles south-west of Burgess Hill, in West Sussex. Every kind of property in Newtimber can book us for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. Our West Sussex coverage runs to 371 places, and Newtimber is one of them. For nearby work, see our Brighton page (6 miles or so).
Jobs for external mastic in BN6 works the same way as everywhere else we cover. We also cover Clayton (2 miles east), Hurstpierpoint (2 miles north), Hurst Wickham (2 miles north-east), Hassocks (2 miles north-east) and Keymer (3 miles north-east). Larger places within reach include Crawley (14 miles north), Horsham (12 miles north-west), Worthing (11 miles south-west), Haywards Heath (8 miles north-east), Burgess Hill (5 miles north-east) and Shoreham-by-Sea (6 miles south-west).
What’s near Newtimber
The closest station to Newtimber is Hassocks station, about 2.4 miles north-east of the centre. Well-known places in the area include The Dene Hospital (4.2 miles north) and The Budding Foundation Museum of Gardening (2.1 miles north-east). Green spaces nearby include Woods Mill and Wolstonbury Hill.
Honest limits
Before you book, it’s worth knowing the limits:
- Structural movement, which needs a surveyor or engineer
- Cutting new joints into brickwork, which is building work rather than sealant work
- Cracked brickwork or render that needs a builder or plasterer
If you’re not sure, just call 0345 464 0079 or email us and we will give you a straight answer.
Where we work in Newtimber
- Render & cladding joints
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
- Façade panels
How to look after the new joints
Looking after new joints is easy:
- Point out the joints to other trades
- Deal with leaking gutters that soak the joints below
- Never let anyone fill a movement joint with mortar
- Clear growth from the base of walls and joints
Keep pressure washers away from the sealant. High-pressure water can lift the edges over time.
Act while the splits are small. Then it’s a straightforward cut-out and reseal with no damage behind it to deal with.
The process
Before we leave, we go over the finished joints with you and tell you how long to leave it. The work normally takes a few hours to a few days, depending on the length of joint and the access, depending on the size of the job. In a small place like Newtimber, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Clear items away from the joints we are working on
- Keep pets and children clear of the area while we work
Ask for a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, call 0345 464 0079 or email us.