West Sussex · England
Langley Green External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Langley Green, with a 12-month guarantee on every job. Ask us for a quote.
- Water getting into walls through failed joints
- Cracked joints where brick meets render or frames
- Movement joints with cracked, split or missing sealant
External mastic for homes and businesses in Langley Green
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing and we use one wherever it does. We work on brickwork movement joints, copings & trims and render & cladding joints, and the jobs we see most are failed sealant between panels on a façade and cracked joints where brick meets render or frames.
Outbuildings, garages and conservatories around homes in places like Langley Green add more joints to look after. Leaks generally start at a gutter end, a garage door frame or where an extension meets the house.
Every job comes with our one-year guarantee, wherever you are in West Sussex.
- Where
- Langley Green (RH11, RH10)
- Region
- West Sussex
- Cover
- One year on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we’re called out for in Langley Green
Sometimes a movement joint was filled with mortar or a rigid filler. The joint can’t move, so the wall cracks somewhere else instead.
The most common problems we see are:
- Hard, crazed mastic that has stopped moving
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
- Movement joints filled with mortar instead of sealant
For an older house near a landmark such as Voice of Deliverance Full Gospel Church of God, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Questions to ask before you book
- What the quote includes, VAT included or not
- Whether the sealant suits the joint
- What guarantee comes with the work
- How much experience the applicator has
What we can’t put right
A few problems are outside what sealant work can do:
- Adding movement joints to masonry that has none
- Movement that is more than a sealant joint can take
- Cracking across the wall rather than at a joint
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
What we seal
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
- Façade panels
Your questions about external mastic in Langley Green
Is Langley Green 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.
Should the sealant in an older Langley Green home be renewed?
If it hasn’t been replaced for some years, it’s usually worth it. Sealant is a maintenance item: how long it lasts depends on use, cleaning and exposure.
Do the sealants smell?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used.
Can new sealant go over the old?
No, it won’t last. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
Where do you work from?
We are a Crawley-based firm. We work across South East England, London and Scotland.
How long will you be here?
Typically it takes anything from a few hours to several days, depending on the building. Larger jobs naturally take longer, and we will tell you how long to expect.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we will explain our choice.
Nearby places to Langley Green
Also in Langley Green
External mastic in Langley Green: local notes
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Crawley, which Langley Green is part of, is one of England’s post-war new towns. Many homes date from the post-war decades and were built in phases, so neighbouring houses often have rooflines and wall joints of the same age, wearing out at the same time.
If you look after a building such as Langley Green Primary, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For landlords with property near Crawley station, outside joints that have cracked can let damp into a rental, so check them between lets.
Langley Green is about 1 mile north of Crawley, in West Sussex. We carry out external mastic for homes and businesses in Langley Green. Our West Sussex coverage runs to 371 places, Langley Green among them.
Work in RH11 and RH10 is quoted and booked the same way as anywhere else. You will find streets such as London Road, Cherry Lane and Dobson Road, and we cover them all. If you are just outside Langley Green, we cover West Green (1 mile south), Crawley (1 mile south), Three Bridges (2 miles south-east), Southgate (2 miles south) and Forge Wood (2 miles east). We also work in nearby towns such as Horsham (7 miles south-west), Haywards Heath (10 miles south-east), Burgess Hill (12 miles south), East Grinstead (8 miles east), Broadfield (3 miles south) and Billingshurst (14 miles south-west).
Local landmarks in Langley Green
Around Langley Green, our work takes us to homes and buildings near Dr Samuel Johnson pub, Central Sussex College and Hazelwick School. The nearest railway station is Crawley station, about 1.4 miles south of the centre. Nearby you will also find Crawley Museum (1 mile south) and Langley Green Hospital (less than half a mile south). Green spaces nearby include Tilgate Lake.
Why act early in Langley Green
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render near the open joint, so the damage spreads beyond the joint. In a smaller place like Langley Green, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Why us?
- More than 20 years in sealant work
- 12-month guarantee on every job
- Tidy, careful work
- We are fully insured
Read our cost guide and customer reviews.
Aftercare tips
Aftercare is simple:
- Keep high-pressure jets off the joints
- Fix overflowing gutters above sealed joints
- Point out the joints to other trades
- Look over the joints every year, ideally after winter
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
A joint that has stopped moving pushes the movement elsewhere, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
Landlord and commercial work in Langley Green
We work for landlords and agents as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
If you manage several properties in or around Langley Green, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
Quotes for external mastic in Langley Green
There’s no set price list, because jobs vary so much. What we look at:
- The number of rooms or windows
- Any mould that needs treating
- Whether old sealant or filler has to be cut out
- How much there is to do
What it costs depends on the size of the job, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts.
Asking for a quote
You do not need to know the technical terms. Just tell us:
- How many joints, rooms or windows are involved
- Photos by email, if that is easy
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
If you are in Langley Green and need external mastic, 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.
How it works
Before we leave, we go over the finished joints with you and tell you how long to leave it. The visit itself usually takes a few hours for a handful of joints, longer for a whole elevation, depending on how much there is to do. In a smaller place like Langley Green, 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.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Mention any parking rules near the property
- Clear items away from the joints we’re working on
- Mention any leaks or damp you’ve noticed
Getting a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work.