West Sussex · England
External & façade joints in Southgate, West Sussex
We cover Southgate for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Movement joints with cracked, split or missing sealant
- Old sealant gone brittle and cracked
- Movement joints filled with mortar instead of sealant
How we handle external mastic in Southgate
Short cuts in external joints show up within a season or two. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We strip the joint back and start again. Common call-outs are for cracked joints where brick meets render or frames and leaking joints around cladding and façade panels, across façade panels, copings & trims and concrete & block.
Homes around Southgate range from older cottages to newer houses, with walls and rooflines of every type. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
You’re covered for a year from the day we finish. If anything is not right with it, phone 0345 464 0079 or send us an email.
- Place
- Southgate (RH10, RH11)
- Region
- West Sussex
- Guarantee
- One year on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
External mastic in Southgate: local notes
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. Historic houses like Tyes Place (about 5 miles south) are a reminder that the area around Southgate has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
In the older streets around St Mary's, the joints between older walls, newer extensions and the roofline need a sealant that can move. For landlords with property near Crawley station, split movement joints are easy to miss on a rental until damp shows inside.
Southgate is about 1 mile south-west of Crawley, in West Sussex. Jobs in Southgate get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. 371 places in West Sussex are on our list, from the larger towns to small villages.
All of RH10 and RH11 is covered for external mastic, from the main roads to the quietest streets. Streets in the area include Oak Road, Cook Road and Colet Road, and we cover them all. You’ll find Southgate on the A2004 and A2219, so it’s easy for us to get to. We also cover the places around Southgate: Crawley (1 mile north-east), Tilgate (1 mile east), West Green (1 mile north), Three Bridges (1 mile north-east) and Langley Green (2 miles north). Within a short drive, we also cover Horsham (6 miles south-west), Haywards Heath (9 miles south-east), Burgess Hill (11 miles south), East Grinstead (8 miles east), Billingshurst (13 miles south-west) and Roffey (5 miles south-west).
Landmarks near Southgate
We work in homes and buildings around Three Bridges Junior School, St Wilfrid's Catholic School and Tilgate Park. Southgate has its own railway station: Crawley station. Other landmarks nearby include Crawley Museum (0.7 miles north) and County Mall (0.5 miles north-east). Green spaces nearby include Tilgate Lake.
What we’re called out for in Southgate
A lot of failed joints come down to preparation: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
Look out for these signs:
- Panel joints letting water in
- Joints pointed up with cement by mistake
- Failed seals between different materials
- Damp patches traced to an open external joint
Schools such as Southgate Primary are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Comparing quotes
- Whether all the old sealant comes out first
- How the joint is cleaned and prepared
- What the quote includes, VAT included or not
- Whether the sealant suits the joint
Why it’s worth doing now in Southgate
Running new sealant over the old bead rarely lasts. New sealant does not bond well to old, weathered sealant, so we always take the old sealant out. Around Southgate, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
What it costs 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 we start.
Why Southgate customers choose us
- Quality sealants from Arbo and Everbuild
- Old sealant always removed completely
- More than 20 years in sealant work
- Rated 4.9 stars on Google
Take a look at what affects the cost or customer reviews.
Southgate: your questions answered
Will you come out to Southgate?
Yes. Southgate is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is it worth replacing old sealant in an older home in Southgate?
Often, yes: cracked, shrunken or mouldy sealant has done its job. The key is cutting all the old sealant out, as new sealant will not bond to it.
Is it OK to fill a movement joint with cement?
No. Rigid materials can’t move with the wall. Where a joint has been mortared, it can often be raked out and sealed properly.
How do I get a quote for external mastic in Southgate?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before we start.
Will the old sealant be removed?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses, and we are fully insured.
Can you quote for more than one area?
Of course. Doing several areas at once is generally more efficient.
Do I need to be at home?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Surface by surface
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible.
Render joints
The face of render can be soft, so a sealant that stretches easily protects the edges. Priming is done where the sealant calls for it.
What we can’t put right
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Cracks in the bricks or render themselves, away from the joints
- Movement that is more than a sealant joint can take
- Adding movement joints to masonry that has none
If you’re not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
What we seal
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Façade panels
- Joints between brick and frames
Nearby places to Southgate
Other services in Southgate
Should I try it myself first?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
What happens on the day
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the job takes anything from a few hours to several days, depending on the building for a typical job. In a smaller place like Southgate, 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.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- Old sealant and any debris are cut and raked out.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Tell us about any water getting in
- Mention if the joints have been sealed before
- Clear items away from the joints we are working on
How to get a quote
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work.
Related advice
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Look over the joints every year, ideally after winter
- Leave the joints unpainted unless we have said otherwise
- Don’t let climbing plants root in the sealant
- Fix overflowing gutters above sealed joints
Only paint over the joint if we have confirmed the sealant can take paint. Many exterior sealants are not designed to be painted.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years.