West Sussex · England
External Mastic in Felpham
External mastic for Felpham, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Cracked joints where brick meets render or frames
- Panel joints letting water in
- Sealant pulling away from one side of the joint
Outside joints around Felpham
Felpham is within about 1 mile 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, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near Church of St Mary, older walls, gutters and the joints where extensions meet them need a flexible sealant. For site and facilities teams at buildings such as Felpham Community College, larger buildings have long runs of movement joint that eventually need resealing.
Felpham is about 1 mile east of Bognor Regis, in West Sussex. Homes, rented property, offices and hotels in Felpham 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, Felpham among them. Our Portsmouth page covers work nearby.
Work in PO22 and PO21 is quoted and booked the same way as anywhere else. Streets in the area include Sea Road, Ley Road and Limmer Lane. Nearby, we also carry out external mastic in South Bersted (1 mile west), Flansham (1 mile north-east), Bognor Regis (1 mile west), Middleton-on-Sea (2 miles east) and Shripney (2 miles north-west). Within a short drive, we also cover Worthing (11 miles east), Chichester (6 miles north-west), Selsey (7 miles south-west), Littlehampton (6 miles east), Lancing (15 miles east) and Emsworth (13 miles west).
Around Felpham
Around Felpham, our work takes us to homes and buildings near The Brooks Local Nature Reserve, The Thatched House and Downview Primary School and the streets around them. The closest station to Felpham is Bognor Regis station, about 1 mile west of the centre. A little further out are Bognor Regis Museum (1.2 miles south-west) and Bognor Regis War Memorial Hospital (1 mile west).
External mastic in Felpham
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement. We work on copings & trims, façade panels and brickwork movement joints, and the jobs we see most are weeds or debris growing in open joints and sealant that has lost its bond to the brick or render.
In a smaller place like Felpham, some homes face open ground, so exposed walls and rooflines take more wind-driven rain. That’s where gutter joints and wall joints tend to fail first.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Felpham (PO22, PO21)
- Region
- West Sussex
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What affects the cost of external mastic
You will get a clear quote before work begins. It takes into account:
- Working hours on commercial sites
- The old material and how stubborn it is
- How easy the joints are to reach
- How many rooms, windows or areas are involved
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 the work is at height. We take all of that into account in your quote.
Helping us quote
What to tell us when you ask for a quote:
- Any access issues, like height or stairs
- The problem you’ve noticed
- Roughly how big the job is
- Any previous sealing or DIY work
To get a quote, call 0345 464 0079 or email us with the location and a short description of the problem. You’ll have a clear quote before we start.
Different surfaces, different methods
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant.
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. We size the backing rod to the gap so the sealant isn’t too deep.
Landlords, agents and businesses in Felpham
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
We also work for property managers and facilities teams. We can quote a run of properties together.
Places near Felpham
Other services in Felpham
Signs you need external mastic in Felpham
Sunlight, wet weather and frost wear exterior sealant down. Over the years it hardens, cracks on the surface and loses its give, so the joint eventually tears or comes away from one side.
Look out for any of the following:
- Brick movement joints where the sealant has split
- Water getting into walls through failed joints
- Old sealant gone brittle and cracked
- Weeds or debris growing in open joints
Letting a property close to Bognor Regis station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
What to look for in a quote
- How the surfaces are prepared before sealing
- Who turns up on the day
- Whether they’re fully insured
- What the cure time is
Can I do it myself?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
FAQs for Felpham
Will you come out to Felpham?
Yes. Felpham is within the area we cover, which takes in towns, villages and rural addresses. Our work covers 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 Bognor Regis station. Can you help?
Yes, we work for letting agents and landlords. You can phone 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Is it OK to fill a movement joint with cement?
No. Cement or mortar can’t stretch, so the joint stops doing its job. Where a joint has been mortared, it can often be raked out and sealed properly.
How long does the job take?
As a guide, most jobs take a few hours to a few days, depending on the length of joint and the access. Larger jobs naturally take longer, and we’ll say how long yours will take.
Do I have to be there?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Can you reach joints on upper floors?
It depends on the height and the site. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
Will the old sealant be removed?
Yes, always, and completely. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
What we do, step by step
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the work takes anything from a few hours to several days, depending on the building for a typical job. For a job in Felpham, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- 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.
Preparing for the visit
- Mention if the joints have been sealed before
- On commercial sites, let us know about site rules
- Let us know about parking restrictions
Get a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will explain what’s involved.
Advice
Looking after it afterwards
After the cure time, these simple habits help:
- Ask before painting over external sealant
- Tell anyone working on the walls about the movement joints
- Check external joints each spring
- Deal with leaking gutters that soak the joints below
Only paint over the joint if we’ve confirmed the sealant can take paint. Many exterior sealants are not designed to be painted, and paint can crack as the joint moves.
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.