West Sussex · England
External Mastic in North Mundham
Problem with your movement joints in North Mundham? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Old sealant gone brittle and cracked
- Weeds or debris growing in open joints
- Sealant that has lost its bond to the brick or render
How we handle external mastic in North Mundham
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. We work on façade panels, render & cladding joints and copings & trims, and the jobs we see most are panel joints letting water in and water getting into walls through failed joints.
In a village or hamlet like North Mundham, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
All of our work is guaranteed for twelve months, in North Mundham and everywhere else we cover.
- Location
- North Mundham (PO20)
- Wider area
- West Sussex
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
What external mastic looks like in North Mundham
North Mundham is within about 3 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For site and facilities teams at buildings such as North Mundham Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. In the older streets around The Parish Church of St Stephen, older walls, gutters and the joints where extensions meet them need a flexible sealant.
North Mundham is about 2 miles south-east of Chichester, in West Sussex. North Mundham gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Across West Sussex, we cover 371 places, and North Mundham is one of them. Portsmouth is on our list too, about 14 miles from North Mundham.
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, Fletcher Place and Palmer Place. We also cover the places around North Mundham: Runcton (1 mile east), Hunston (1 mile west), Merston (1 mile east), Donnington (1 mile west) and Lagness (2 miles south-east). Larger places within reach include Bognor Regis (4 miles south-east), Selsey (6 miles south), Littlehampton (10 miles east), Emsworth (8 miles west), Rustington (11 miles east) and Storrington (15 miles north-east).
What’s near North Mundham
In North Mundham, that means homes and buildings near The Spotted Cow Public House and Chichester High School For Girls. The closest station to North Mundham is Chichester station, roughly 1.6 miles north-west. Well-known places in the area include St Richard's Hospital (2.1 miles north) and Chichester Cathedral Treasury (1.8 miles north-west).
What happens if it’s left?
Running new sealant over the old bead rarely lasts. New sealant doesn’t bond well to old, weathered sealant, so we always take the old sealant out. Around North Mundham, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part.
Why book with us
- Over 20 years’ experience
- Full insurance on every job
- Old sealant always removed completely
- Colour picked to suit the job
Read what affects the cost and our reviews.
Towns and villages near North Mundham
Other services in North Mundham
What affects the cost of external mastic
We quote each job individually. These are the things that affect it:
- Which sealant suits the joint
- Access and height
- The number of rooms or windows
- Whether old sealant or filler has to be cut out
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and agree the price before starting.
Helping us quote
To help us quote quickly, let us know:
- How many joints, rooms or windows are involved
- Photos by email, if that is easy
- Access, such as stairs, a lift or height
- If it’s domestic, commercial or a hotel
It all starts with a short chat. Describe the problem, the location and the size of the job. Whenever you’re ready, call 0345 464 0079 or drop us an email.
What we do, step by step
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, do the work and tidy away. It generally takes a few hours for a handful of joints, longer for a whole elevation. Somewhere like North Mundham needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Clear items away from the joints we’re working on
- On commercial sites, let us know about site rules
Get a quote
We quote each job on its own. Simply call 0345 464 0079 or email us and describe the job, and photos are welcome.
Advice
When to call us in North Mundham
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
Keep an eye out for these signs:
- Panel joints letting water in
- Movement joints filled with mortar instead of sealant
- Hard, crazed mastic that has stopped moving
- Cracked joints where brick meets render or frames
For landlords with property near Chichester station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What your quote should include
- How the joint is cleaned and prepared
- Whether VAT is included
- What happens if the job turns out different
- Whether the sealant suits the joint
What sealant work cannot fix
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Cracking across the wall rather than at a joint
- Damp that isn’t coming from the joint
- Render that is blown, hollow or coming away
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly.
Surfaces we seal
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Façade panels
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
If you’re 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 doesn’t work out, we can still put it right.
Questions from North Mundham
Will you come out to North Mundham?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Is external mastic in a coastal place like North Mundham any different?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
How long does external mastic 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 tell you how long to expect.
Is there any odour?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
What do you put in the joint?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference.
What do you need from me for a quote?
Tell us what needs doing and where, with photos by email if possible. If we need more, we’ll ask.
Can you do several jobs on one visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit.