East Sussex · England
External & façade joints in Wych Cross, East Sussex
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Wych Cross and across East Sussex. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Panel joints letting water in
- Plants rooting in failed movement joints
- Movement joints with cracked, split or missing sealant
External mastic for homes and businesses in Wych Cross
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. If you have movement joints filled with mortar instead of sealant and leaking joints around cladding and façade panels, we can put it right, whatever the surface.
Outside joints can only be sealed when they’re dry, so work in Wych Cross is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
Every job is covered by our one-year guarantee.
- Place
- Wych Cross (RH18)
- Wider area
- East Sussex
- Guarantee
- One year on every job
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Do you need external mastic in Wych Cross?
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The new sealant then lets go long before it should.
Common reasons people contact us include:
- Cracked joints where brick meets render or frames
- Movement joints with cracked, split or missing sealant
- Weeds or debris growing in open joints
- Rain getting behind render or cladding at a joint
Standen, about 3.2 miles north-west, is one of the historic houses in the wider area around Wych Cross, and older homes nearby need a sealant that suits their walls.
Questions to ask before booking
- Whether you can choose the colour
- What the quote includes, VAT included or not
- What happens if they find a problem under the old sealant
- The length of the guarantee
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Look over the joints every year, ideally after winter
- Never let anyone fill a movement joint with mortar
- Get split or bare joints resealed while the damage is small
- Clear growth from the base of walls and joints
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
Towns and villages near Wych Cross
More services for Wych Cross
Can I do it myself?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Questions from Wych Cross
I let a flat near East Grinstead station. Can you help?
Yes, we work for letting agents and landlords. You can ring 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.
Is Wych Cross in your area for external mastic?
Yes, Wych Cross is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll give you a clear price.
What does external mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
Do you use backing rod?
Backing rod goes into deeper joints as a matter of course. It controls the depth and stops the sealant bonding to the back so the bead can stretch.
How long before the joint can be used?
That depends on the sealant used, so please follow the time we give you.
Are you insured?
Yes. We’re fully insured.
Where are you based?
We’re based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Can you seal joints between two different materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. We pick a colour that works with both materials.
What we do, step by step
There isn’t much for you to do on the day. Show us the job and we’ll take it from there. The work itself takes anything from a few hours to several days, depending on the building from start to finish. Somewhere as small as Wych Cross, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Clear items away from the joints we are working on
- Tell us if parking is tricky
- Tell us about any water getting in
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you’re ready, ring 0345 464 0079 or email us.
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Work for landlords, hotels and businesses
We also work for property managers and facilities teams. We can quote a run of properties together.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can go on one quote.
Walls and rooflines in Wych Cross
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Standen (about 3.2 miles north-west) nearby, there’s older building stock in the area around Wych Cross as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Rented homes near East Grinstead station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. Schools such as Greenfields School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Wych Cross is about 4 miles south-east of East Grinstead, in East Sussex. Whether you are in the middle of Wych Cross or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Our East Sussex coverage runs to 289 places, Wych Cross among them. You can also see our page for Crawley, about 10 miles away.
Our applicators cover all of the RH18 postcode area for external mastic. That includes homes and businesses on Lewes Road and Wych Cross. Nearby, we also carry out external mastic in Chelwood Gate (1 mile south), Forest Row (2 miles north), Birchgrove (2 miles south-west), Coleman's Hatch (2 miles north-east) and Chelwood Common (2 miles south). Further out, we also cover Lewes (13 miles south), Crowborough (6 miles east), Uckfield (8 miles south-east), South Malling (13 miles south), Heathfield (12 miles south-east) and Southover (14 miles south).
Local landmarks in Wych Cross
Wych Cross’s nearest station is East Grinstead station, roughly 4.5 miles north-west. Well-known places in the area include Heaven Farm Museum (3.6 miles south) and Waterbury Castle (3.6 miles south-west). Not far away are Brickfield Meadow.
What affects the quote in Wych Cross
The quote reflects the job in front of us. We take into account:
- Whether old sealant or filler has to be cut out
- How much there is to do
- Access and height
- When we can work, for business premises
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What we need to know
When you contact us, these details help:
- Roughly how big the job is
- How we’d reach the joints
- Any previous sealing or DIY work
- Where the property is
For external mastic in Wych Cross, ring 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before work begins.
Leave it or put it right?
Resealing a run of joints in one go is generally better than patching one at a time. They’ve weathered the same way, and access only has to be arranged once. Around Wych Cross, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or send us an email.
Why us?
- Anti-fungal sanitary silicone in wet areas
- Quality sealants from Arbo and Everbuild
- Experience in homes, commercial sites and hotels
- ARBOMaster approved applicator
Read our cost guide and customer reviews.