West Sussex · England
External Mastic in Southwater
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Southwater and across West Sussex. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Weathered mastic that no longer stretches
- Leaking joints around cladding and façade panels
- Damp patches traced to an open external joint
External mastic in Southwater
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 access is needed. We work on façade panels, render & cladding joints and joints between brick and frames, and people most often call us about leaking joints around cladding and façade panels and hard, crazed mastic that has stopped moving.
In and around Southwater, 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.
You are covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or drop us an email.
- Where
- Southwater (RH13)
- Region
- West Sussex
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the quote in Southwater
Call for a quick quote. What matters most is:
- The product the joint needs
- The number of rooms or windows
- Whether the work is at height
- Whether there’s mould to deal with
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- If someone has resealed it before
- Any access issues, like height or stairs
- Pictures of the joints, sent by email
- If it’s domestic, commercial or a hotel
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.
The process
When we arrive, we start by going over the job with you. Surfaces next to the work are protected before any work begins. The work generally takes a few hours to a few days, depending on the length of joint and the access. In a smaller place like Southwater, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- 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.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- On commercial sites, let us know about site rules
- Mention any parking rules near the property
- For indoor joints, keep the area dry beforehand if you can
Get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, phone 0345 464 0079 or drop us an email.
Advice
Signs you need external mastic in Southwater
Sometimes a movement joint was filled with mortar or a rigid filler. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
The problems people normally mention when they call include:
- Gaps where render, brick and frames meet
- Brick movement joints where the sealant has split
- Rigid filler in a joint that should flex
- Panel joints letting water in
In the older streets around Holy Innocents Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Before booking anyone
- Which colour the sealant will be
- How much experience the applicator has
- Is the old sealant removed completely?
- Are they insured?
Also near Southwater
Also in Southwater
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
A DIY attempt does not rule out a professional job. We cut it out and start again.
What happens if it’s left?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. Around Southwater, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
The cost depends on how much there is to do, how hard the old material is to remove and access to the work. We give a clear quote before any work starts, so you know where you stand.
Why us?
- White, clear, grey or another colour, product permitting
- Every job guaranteed for a year
- Sanitary silicone with an anti-fungal additive in wet areas
- A sealant colour to suit the surroundings
Read our cost guide or customer reviews.
Surface by surface
Copings and trims
A failed coping joint lets water into the top of the wall. Resealing them is a small job that protects a lot.
Cladding and façade panels
Panels heat up and cool down quickly, so the joints work hard every day. We choose the product to suit.
Southwater questions
I let a flat near Christs Hospital 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 will give you a fixed price before we start.
Is Southwater within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first.
Are you insured?
Yes. We’re fully insured.
Can you quote for more than one area?
Of course. Doing several areas at once is normally more efficient.
Is there a guarantee?
Yes. Every job comes with our one-year guarantee.
Why do you put foam in the joint first?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. That way it bonds to the two sides only and can stretch.
What do you need from me for a quote?
Let us know what needs doing and where. We will ask anything else we need to know.
Outside joints around Southwater
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Christs Hospital station? Then split movement joints are easy to miss on a rental until damp shows inside. If you look after a building such as Southwater Infant Academy, its movement joints, gutters and trims need looking after like any other building’s.
Southwater is about 3 miles south of Horsham, in West Sussex. Jobs in Southwater get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Our area takes in 371 places across West Sussex, large and small. For nearby work, see our Crawley page (9 miles or so).
Work in RH13 is quoted and booked the same way as anywhere else. That includes homes and businesses on Station Road, Walmer Close and Pevensey Road and the roads around them. Neighbouring places we cover for external mastic include Tower Hill (2 miles north), Nuthurst (2 miles east), Brooks Green (2 miles west), Barns Green (2 miles west) and Maplehurst (2 miles south-east). Further out, we also cover Crawley (9 miles north-east), Horsham (3 miles north), Worthing (14 miles south), Haywards Heath (11 miles east), Burgess Hill (11 miles south-east) and Shoreham-by-Sea (13 miles south).
What’s near Southwater
We work in homes and buildings around The Lintot pub and The Doyle School of Design and Technology. Southwater’s nearest station is Christs Hospital station, roughly 1.9 miles north-west of the centre. A little further out are Christs Hospital School Museum (1.5 miles north-west) and Horsham Hospital (3.2 miles north). The countryside around Southwater includes Knepp Wildland.
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Keep soil, plants and ivy away from the joints
- Keep movement joints as flexible joints, not mortar
- Deal with leaking gutters that soak the joints below
- Have failed joints looked at early
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick.