West Sussex · England
External Mastic in Highbrook
External mastic for Highbrook, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Movement joints with cracked, split or missing sealant
- Failed sealant between panels on a façade
- Joints where the bead has come unstuck
External mastic in Highbrook
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. We work on joints between brick and frames, render & cladding joints and façade panels, and common reasons people get in touch are failed seals between different materials and joints pointed up with cement by mistake.
Older homes in small places like Highbrook may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points.
Big or small, you get the same one-year guarantee.
- Place
- Highbrook (RH17)
- Region
- West Sussex
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we can’t put right
It helps to know what we cannot do too:
- Subsidence or other structural problems
- Rising or penetrating damp from elsewhere in the wall
- Failed render or damaged cladding panels
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think before booking.
What we seal
- Copings & trims
- Brickwork movement joints
- Façade panels
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
Your questions about external mastic in Highbrook
Can you help a landlord with a rental near Balcombe station?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear price.
Is Highbrook within the area you cover?
Yes. Highbrook 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.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We will give you the cure time for the product we used.
Can you seal joints between render and window frames?
Yes. Joints between dissimilar materials are a big part of external work. The sealant is chosen to bond to both sides, primed where needed.
What is backing rod for?
We fit closed-cell backing rod wherever the joint depth needs controlling. It controls the depth and stops the sealant bonding to the back, so the joint can move.
How long does the job take?
Typically it takes anything from a few hours to several days, depending on the building. Larger jobs naturally take longer, and we’ll say how long yours will take.
How much does external mastic cost in Highbrook?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Should I point up the gap in my brickwork?
No. Rigid materials cannot move with the wall. Where a joint has been mortared, it can often be raked out and sealed properly.
Why it’s worth doing now in Highbrook
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. A stiffer product can damage the joint edge as it fails. In a small place like Highbrook, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Why us?
- Any old sealant cut out fully, not covered over
- Fully insured
- Homes, businesses and hotels
- A 12-month guarantee on all work
How it works
There is not much for you to do on the day. Point us to the joints and we will get on with it. The job generally takes anything from a few hours to several days, depending on the building, including the tidy-up. Somewhere like Highbrook 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.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Let us know about earlier repairs to the joints
- Tell us about any water getting in
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
We quote each job on its own, so the first step is telling us about yours. Just phone 0345 464 0079 or send us an email with the details and send pictures if you have them.
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What we are called out for in Highbrook
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
Most people get in touch when they notice something like this:
- Movement joints filled with mortar instead of sealant
- Hard, crazed mastic that has stopped moving
- Panel joints letting water in
- Joints where the bead has come unstuck
If you live in an older home near All Saints Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Comparing quotes
- Who does the work, and how experienced they are
- What happens if the job turns out different
- How the colour is chosen
- Are they insured?
Highbrook buildings and the weather
Historic houses like Priest House (about 1.5 miles north) are a reminder that the area around Highbrook 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. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as St Peter's CofE Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For landlords with property near Balcombe station, split movement joints are easy to miss on a rental until damp shows inside.
Highbrook is about 4 miles north-east of Haywards Heath, in West Sussex. Anywhere in RH17, we cover external mastic for homes and businesses. Across West Sussex, we cover 371 places, Highbrook among them. We also work in Crawley, around 7 miles away.
Every address in RH17 is within our area for external mastic. Close by, we work in Ardingly (1 mile south-west), Little London (1 mile west), Sharpthorne (2 miles north), West Hoathly (2 miles north) and Horsted Keynes (2 miles south-east). Larger places within reach include Crawley (7 miles north-west), Horsham (11 miles west), Haywards Heath (4 miles south-west), Burgess Hill (7 miles south-west), East Grinstead (5 miles north) and Broadfield (7 miles north-west).
What’s near Highbrook
In Highbrook, that means homes and buildings near The Ardingly Inn and the streets around them. The closest station to Highbrook is Balcombe station, about 3.4 miles west of the centre. Nearby you will also find Princess Royal Hospital (4.6 miles south) and Parish Museum (2.8 miles south). The countryside around Highbrook includes Blunts Wood and Paiges Meadow.
What affects the quote in Highbrook
We don’t publish a price list. The quote depends on:
- Which sealant suits the joint
- How easy the joints are to reach
- The number of rooms or windows
- Working hours on commercial sites
What you pay reflects the work, not guesswork. That’s why we ask about the job first.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- What the problem is, such as mould, gaps, leaks or cracking
- Any access issues, like height or stairs
- Roughly how big the job is
- Photos by email, if that’s easy
If you’re in Highbrook and need external mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Letting agents and landlords in Highbrook can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
Nearby places to Highbrook
Also in Highbrook
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Do not let climbing plants root in the sealant
- Show decorators and builders where the movement joints are
- Act on the first splits you see
- Wash walls gently around the sealant
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.