East Sussex · England
External Mastic in South Heighton
We cover South Heighton for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Plants rooting in failed movement joints
- Water getting into walls through failed joints
- Joints with sealant missing in places
External mastic in South Heighton, done properly
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement where mortar or filler would crack. We work on concrete & block, joints between brick and frames and render & cladding joints, and the jobs we see most are old sealant gone brittle and cracked and water getting into walls through failed joints.
Somewhere as small as South Heighton, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Gutter joints and wall joints there need a sealant that can flex and stay put.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Where
- South Heighton (BN9)
- Region
- East Sussex
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
We bring everything the job needs with us, so there’s nothing for you to buy. Once we’ve agreed what’s being done, the area is protected and the work begins. It normally takes anything from a few hours to several days, depending on the building. Somewhere like South Heighton needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Where the joints are inside, avoid wetting them before we arrive
- Tell us if parking is tricky
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you’re ready, ring 0345 464 0079 or drop us an email.
Read more
Other services in South Heighton
Landlord and commercial work in South Heighton
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
What sealant work can’t fix
We’d rather tell you now than do work that won’t last, so here’s what sealant cannot put right:
- Failed render or damaged cladding panels
- Walls that need new movement joints cut into them
- Cracks in the bricks or render themselves, away from the joints
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly.
Where we work in South Heighton
- Brickwork movement joints
- Copings & trims
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Concrete & block
Surface by surface
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. If that is happened, we rake it out and reseal it properly where it can be done safely.
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap and keep the sealant to the right depth.
Your questions about external mastic in South Heighton
Is South Heighton within the area you cover?
Yes, South Heighton is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
I let a flat near Newhaven Town station. Can you help?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before work begins.
Is it OK to seal over old sealant?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Do you do commercial work?
Yes. We’ve worked for hotels, offices and other businesses, and we’re fully insured.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Where is Mr Mastic based?
We are based in Crawley, West Sussex, and we work across South East England, London and Scotland.
Why deal with it now?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render around the joint, so the damage spreads beyond the joint. In a small place like South Heighton, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
What you get with us
- Arbo and Everbuild products
- Fully insured
- Homes, businesses and hotels
- White, clear, grey or coloured to suit, where the product allows
Take a look at our cost guide and our reviews.
Outside joints around South Heighton
South Heighton is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. London and the South East are among 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 Newhaven Town station? Then outside joints that have cracked can let damp into a rental, so check them between lets. In the older streets around Church of St Leonard, older walls, gutters and the joints where extensions meet them need a flexible sealant. Managing a site like Denton Community Primary School and Nursery? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
South Heighton is about 1 mile north of Newhaven, in East Sussex. Every kind of property in South Heighton can book us for external mastic. Every job comes with our 12-month guarantee. Our East Sussex coverage runs to 289 places, and South Heighton is one of them. We also work in Brighton, around 8 miles away.
Postcode districts we cover here for external mastic: BN9. We also cover the places around South Heighton: Denton (1 mile south), Piddinghoe (1 mile west), Rodmell (3 miles north-west), Telscombe (3 miles west) and Firle (3 miles north). We also work in nearby towns such as Eastbourne (10 miles east), Seaford (3 miles south-east), Lewes (5 miles north-west), Hailsham (10 miles north-east), Uckfield (11 miles north) and Polegate (8 miles east).
Around South Heighton
In South Heighton, that means homes and buildings near Castle Hill, Hampden Arms and UTC@Harbourside, among other places. The nearest railway station is Newhaven Town station, about 0.8 miles south. Well-known places in the area include Planet Earth Museum (under half a mile south-west) and Arlington Castle (4.8 miles east). Not far away are Itford Hill and Southerham Farm.
What affects the quote in South Heighton
Call for a quick quote. The main things that affect it are:
- The product the joint needs
- The number of rooms or windows
- The size of the job
- How much old sealant there is and how hard it is to remove
Doing several joints on one visit usually makes better use of the time than several visits. We’ll give you a clear price for the lot.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Photos by email, if that is easy
- The address or postcode of the job
- The problem you’ve noticed
- Whether it’s a home or a business
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we will talk you through the work before giving you a price.
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.