West Sussex · England
External Mastic in Lancing
Sealing brickwork movement joints, render, cladding and façade joints in Lancing, with a one-year guarantee on every job. Call for a quick quote.
- Water getting into walls through failed joints
- Joints with sealant missing in places
- Sealant pulling away from one side of the joint
External mastic for homes and businesses in Lancing
Getting the depth right is half the job. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. We work on brickwork movement joints, joints between brick and frames and render & cladding joints, and the jobs we see most are damp patches traced to an open external joint and weeds or debris growing in open joints.
In and around Lancing, older properties sit alongside newer ones, each with its own outside joints. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
Each job carries a 12-month guarantee, whatever its size.
- Where
- Lancing (BN15)
- Region
- West Sussex
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What we are called out for in Lancing
Sometimes a movement joint was filled with mortar or a rigid filler by mistake. The joint cannot move, so the wall cracks somewhere else instead.
Signs it’s time to call us include:
- Gaps where render, brick and frames meet
- Water getting into walls through failed joints
- Joints pointed up with cement by mistake
- Weeds or debris growing in open joints
For landlords with property near Lancing station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What your quote should include
- What happens if they find a problem under the old sealant
- How long to leave it before use
- Who turns up on the day
- Is the old sealant removed completely?
Different surfaces, different methods
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant so the movement is taken up.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
Outside joints around Lancing
Lancing is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Managing a site like The Globe Primary Academy? Then its movement joints, gutters and trims need looking after like any other building’s. In the older streets around St. Michael & All Angels, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Lancing is about 3 miles east of Worthing, in West Sussex. Jobs in Lancing get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across West Sussex, we cover 371 places, and Lancing is one of them. You can also see our page for Brighton, roughly 8 miles from Lancing.
Every address in BN15 is covered for external mastic. That includes homes and businesses on North Road, North Farm Road and Addison Close. Being close to the A2025, Lancing is simple for us to get to for external mastic. If you are just outside Lancing, we cover Sompting (1 mile west), East Worthing (2 miles south-west), Broadwater (2 miles west), Offington (3 miles west) and Botolphs (3 miles north). Further out, we also cover Worthing (3 miles west), Haywards Heath (15 miles north-east), Burgess Hill (12 miles north-east), Littlehampton (9 miles west), Rustington (8 miles west) and Storrington (8 miles north-west).
What’s near Lancing
Around Lancing, our work takes us to homes and buildings near Brooklands Park, Sompting Abbotts Preparatory School and The Railway pub and the streets around them. There’s a railway station in Lancing itself: Lancing station. Nearby you will also find Worthing Hospital (2 miles south-west) and Old Castle (3.1 miles west). Green spaces nearby include Lancing Ring and Widewater Lagoon.
Towns and villages near Lancing
More services for Lancing
What sealant work can’t fix
It helps to know what we can’t do:
- Failed render or damaged cladding panels
- Adding movement joints to masonry that has none
- Rising or penetrating damp from elsewhere in the wall
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Surfaces we seal
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
- Façade panels
- Copings & trims
For landlords and businesses
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.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Some sealant jobs are within reach of a careful DIYer, 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.
How the visit works
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. In total, it normally takes a few hours for a handful of joints, longer for a whole elevation. For a job in Lancing, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We look at every joint and agree a colour to suit the wall.
- 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.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- For business premises, tell us about site rules or sign-in
- Mention any leaks or damp you’ve noticed
How to get a quote
For a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before we start.
Related advice
Common questions in Lancing
Will you come out to Lancing?
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 Lancing station. Can you help?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Do you have insurance?
Yes. Full insurance covers our work.
Do you seal joints where cladding meets other materials?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. The sealant is matched to both sides.
Do you guarantee your work?
Yes. Every job comes with a one-year guarantee.
Which products do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice.
What is backing rod for?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides so it can flex with the joint.
What happens if it’s left?
Water gets in through a failed movement joint and can run behind render or cladding. Resealing early keeps the job to the joint itself, rather than the wall around it. Homes in smaller places like Lancing can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or drop us an email and we will talk you through it.
What you get with us
- 20+ years of sealant experience
- Quality sealants from Arbo and Everbuild
- A choice of colours where the product allows
- We agree the colour with you first
Take a look at our cost guide and customer reviews.