West Sussex · England
External & façade joints in Coates, West Sussex
External mastic in Coates from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Damp patches traced to an open external joint
- Weeds or debris growing in open joints
- Old sealant gone brittle and cracked
What sealant work can’t fix
We will always be straight with you, so here’s what new sealant will not do:
- Walls that need new movement joints cut into them
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Movement that’s more than a sealant joint can take
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think before you book.
Surfaces we seal
- Concrete & block
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Façade panels
External mastic for homes and businesses in Coates
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we’ll confirm what’s needed to reach them safely. We work on brickwork movement joints, concrete & block and joints between brick and frames, and the jobs we see most are joints where the bead has come unstuck and plants rooting in failed movement joints.
Outside joints can only be sealed when they’re dry, so work in Coates is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Location
- Coates (RH20)
- Region
- West Sussex
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
When to call us in Coates
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it cannot stretch and rips as the joint opens.
Common reasons people contact us include:
- Movement joints filled with mortar instead of sealant
- Weathered mastic that no longer stretches
- Gaps where render, brick and frames meet
- Rain getting behind render or cladding at a joint
Schools such as Fittleworth CofE Village School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What your quote should include
- Whether the sealant suits the joint
- The length of the guarantee
- What happens if they find a problem under the old sealant
- How long to leave it before use
Different surfaces, different methods
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible in all weathers.
Cladding and façade panels
Panels heat up and cool down quickly, so the joints work hard every day. The sealant is chosen with that in mind.
What happens on the day
On the day, we look over the joints with you first, so you know exactly what we are doing. Surfaces next to the work are protected before any work begins. The work normally takes a few hours for a handful of joints, longer for a whole elevation. For a village or hamlet like Coates, the journey is planned in advance: 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 inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Mention if the joints have been sealed before
- Keep pets and children clear of the area while we work
Ask for a quote
We quote each job on its own. Just ring 0345 464 0079 or email us with the details.
Read more
Why deal with it now?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. In a small place like Coates, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
A few things move the cost up or down: 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.
Why choose Mr Mastic in Coates
- Colour picked to suit the job
- Over 20 years’ experience
- Tidy, careful work
- We are fully insured
Take a look at what affects the cost and customer reviews.
Coates: your questions answered
Can you do external mastic in Coates?
Yes, Coates is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
Can you help a landlord with a rental near Pulborough station?
Yes. We work for landlords and letting agents as well as homeowners. Just ring 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Coates and the rest of West Sussex.
Will the new joint stand out?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so the joint doesn’t draw the eye.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we’ll explain our choice.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. It’s closed with backing rod and a flexible sealant.
Can you seal joints between two different materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so a flexible sealant is needed where they meet. The sealant is matched to both sides.
What affects the cost of external mastic
You’ll get a clear quote before we start. It takes into account:
- How much there is to do
- The number of rooms or windows
- Any working-time requirements on site
- Access and height
Combining jobs into one visit usually makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
What we need to know
To help us quote quickly, let us know:
- Whether it has been sealed before
- Any access issues, like height or stairs
- The type of property
- A few pictures by email, if you can
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. Whenever you are ready, ring 0345 464 0079 or drop us an email.
What else we do in Coates
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
External mastic in Coates: local notes
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Bignor Roman Villa (about 2.1 miles south) nearby, there’s older building stock in the area around Coates as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
For landlords with property near Pulborough station, split movement joints are easy to miss on a rental until damp shows inside. In the older streets around Church of St Agatha, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Coates is about 10 miles north of Littlehampton, in West Sussex. Whether you are in the middle of Coates or further out, we cover external mastic for every kind of property. Coates is one of 371 places in West Sussex we cover for external mastic. There’s also a page for Crawley, about 20 miles away.
Here we cover the RH20 postcode area for external mastic. Neighbouring places we cover for external mastic include Lower Horncroft (1 mile east), Fittleworth (1 mile north-east), Bedham (1 mile north-east), Watersfield (2 miles south-east) and Coldwaltham (2 miles south-east). Within a short drive, we also cover Horsham (14 miles north-east), Worthing (12 miles south-east), Bognor Regis (12 miles south-west), Chichester (12 miles south-west), Littlehampton (10 miles south) and Lancing (14 miles south-east).
Around Coates
Around Coates, our work takes us to homes and buildings near The Swan Hotel, among other places. For rail, the closest station is Pulborough station, about 2.7 miles east. Nearby you will also find Coates Castle (0.5 miles south-west) and Coultershaw Heritage Site (2 miles north-west). Not far away are Bignor Hill and Amberley Wild Brooks.