West Sussex · England
External & façade joints in Selsey, West Sussex
Specialist external mastic for Selsey: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Moss and dirt in joints with no sealant left
- Water getting into walls through failed joints
- Joints with sealant missing in places
External mastic in Selsey, 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. If you have rain getting behind render or cladding at a joint and panel joints letting water in, we can put it right.
Around Selsey, outside jobs take in garage door frames, porches, gutters and trims as well as walls. Where two materials meet, they move differently, and the sealant has to allow for it.
You get a 12-month guarantee, the same in Selsey as everywhere else we work.
- Place
- Selsey (PO20)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
When it isn’t the sealant
New sealant can’t fix everything, and we’d rather say so up front. Sealant won’t put right:
- Loose or hollow render, which needs re-rendering
- Movement that’s more than a sealant joint can take
- Cracking across the wall rather than at a joint
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think before booking.
Where we work in Selsey
- Concrete & block
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Façade panels
- Joints between brick and frames
What happens on the day
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. Most jobs take a few hours to a few days, depending on the length of joint and the access. In Selsey, parking is rarely complicated, though it helps to know about driveways or restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- 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.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Move anything stored near the joints
- Keep pets and children clear of the area while we work
- Tell us about any previous sealing or DIY attempts
Ask for a quote
Want a quote for external mastic? Please call 0345 464 0079 or send us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Read more
Can I do it myself?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Selsey: your questions answered
Is external mastic in Selsey guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Do you cover Selsey for external mastic?
Yes, Selsey is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear price.
What does external mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote.
What should I tell you?
Let us know what needs doing and where, with pictures by email if possible. If we need more, we’ll ask.
Should I point up the gap in my brickwork?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
Do I have to be there?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
Can you quote for more than one area?
Yes. Just list everything you need and you’ll get one quote.
What is backing rod for?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
Places near Selsey
More services for Selsey
For landlords and businesses
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.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Why act early in Selsey
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost around the joint, so the damage spreads beyond the joint. In Selsey, as anywhere, most leaks start as a small gap in a joint, and they’re far easier to fix early.
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first and send you a clear quote before work begins.
What you get with us
- Any old sealant cut out fully, not covered over
- ARBOMaster approved applicator
- Experience in homes, commercial sites and hotels
- Fully insured
Walls and rooflines in Selsey
Selsey is close to 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Seal Primary Academy? Then its movement joints, gutters and trims need looking after like any other building’s. In the older streets around St Peter's Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Selsey is about 6 miles south-west of Bognor Regis, in West Sussex. For external mastic in and around Selsey, it’s easy to get a quote: please ring 0345 464 0079 or email us. We’re based in Crawley and cover West Sussex, Selsey included. We cover 371 towns and villages across West Sussex. There’s also a page for Portsmouth, roughly 14 miles from Selsey.
We cover every part of the PO20 postcode area for external mastic and the streets around it. External mastic is available to properties on Church Road, High Street and Ellis Square and the roads around them. You’ll find Selsey on the B2145, which makes it straightforward to reach. If you are just outside Selsey, we cover Church Norton (1 mile north-east), Keynor Estate (2 miles north), Sidlesham (3 miles north), Pagham (3 miles north-east) and Street End (4 miles north). Within a short drive, we also cover Bognor Regis (6 miles north-east), Chichester (7 miles north), Littlehampton (12 miles north-east), Emsworth (10 miles north-west), Rustington (13 miles north-east) and Angmering (15 miles north-east). Being one of West Sussex’s larger places, Selsey has homes, rented property and businesses of every kind.
Landmarks near Selsey
Around Selsey, our work takes us to homes and buildings near The Academy, The Fisherman's Joy Public House and The Academy, among other places. Nearby you’ll also find Selsey Lifeboat Museum (0.5 miles south-east).
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Never let anyone fill a movement joint with mortar
- Point out the joints to other trades
- Wash walls gently around the sealant
- Ask before painting over external sealant
Avoid pressure-washing straight into the joints. A strong jet can damage the edges of the bead and let water in behind.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years.
Quotes for external mastic in Selsey
For a quick quote, just ask. What matters most is:
- Any working-time requirements on site
- Mould in or behind the old joints
- The old material and how stubborn it is
- The size of the job
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What we need to know
When you call or email, it’s useful to know:
- Where the job is, and your postcode
- Any previous sealing or DIY work
- A few pictures by email, if you can
- What the problem is, such as mould, gaps, leaks or cracking
Getting a quote is simple: let us know the job and the location. Photos by email help us understand the job, and we will come back to you with a quote.