West Sussex · England
External & façade joints in West Green, West Sussex
Professional external mastic in and around West Green, with every bit of old sealant taken out first and a 12-month guarantee.
- Rigid filler in a joint that should flex
- Rain getting behind render or cladding at a joint
- Moss and dirt in joints with no sealant left
Landlords, agents and businesses in West Green
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
We also work for property managers and facilities teams in West Green and across West Sussex. We can quote a run of properties together, and we are fully insured.
How we handle external mastic in West Green
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. If you have panel joints letting water in and moss and dirt in joints with no sealant left, we can put it right.
In a smaller place like West Green, some homes face open ground, and walls and rooflines facing the weather take the worst of it. Joints on those sides are usually the first to go.
Every job is covered by a one-year guarantee.
- Location
- West Green (RH11, RH10)
- Wider area
- West Sussex
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
We keep the work tidy and contained to the joints we are treating. Expect the work to take anything from a few hours to several days, depending on the building. Parking around West Green is normally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Keep children and pets away from the work area
- Mention any tricky access
- Move anything stored near the joints
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. Whenever you’re ready, phone 0345 464 0079 or send us an email.
Related advice
Keeping the joints in good condition
So the new joints stay in good condition:
- Keep high-pressure jets off the joints
- Fix overflowing gutters above sealed joints
- Leave the joints unpainted unless we have said otherwise
- Look over the joints every year, ideally after winter
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal before water has had years to get in.
Common questions in West Green
Do you work for landlords with property near Crawley station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Is it worth replacing old sealant in an older home in West Green?
If it hasn’t been replaced for some years, it’s normally worth it. Sealant is a maintenance item: how long it lasts depends on use, cleaning and exposure.
Can a movement joint be filled with mortar?
No. Cement or mortar can’t stretch and the joint fails. If it has already been filled, we can normally cut it out and reseal it.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme.
Is it messy?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Where is Mr Mastic based?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
What should I tell you?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or send us an email.
How long before the joint can be used?
It depends on the product and the temperature. We tell you how long to leave it before we go.
What external mastic looks like in West Green
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. Crawley, which West 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 West Green Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. In the older streets around Voice of Deliverance Full Gospel Church of God, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Letting a property close to Crawley station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
West Green is about 1 mile north of Crawley, in West Sussex. Whether you’re in the middle of West Green or further out, external mastic is available for homes and businesses alike. Our area takes in 371 places across West Sussex, from the larger towns to small villages.
We cover every part of RH11 and RH10 for external mastic and the streets around it. If you need external mastic at a property on Bank Lane, Swift Lane and Raven Lane or anywhere close by, our applicators can take on the job. We also cover the places around West Green: Langley Green (1 mile north), Crawley (1 mile south), Southgate (1 mile south), Three Bridges (1 mile east) and Tilgate (1 mile south-east). Further out, we also cover Horsham (7 miles south-west), Haywards Heath (10 miles south-east), Burgess Hill (12 miles south), East Grinstead (8 miles east), Billingshurst (13 miles south-west) and Roffey (6 miles south-west).
Around West Green
In West Green, that means homes and buildings near Ifield Community College, Grattons Park and Dr Samuel Johnson pub and the streets around them. For rail, the closest station is Crawley station, about 0.8 miles south of the centre. Nearby you will also find Crawley Museum (within half a mile south) and Crawley Hospital (0.5 miles south-west). Green spaces nearby include Tilgate Lake.
Honest limits
We won’t take on work that will not last, so here’s what sealant cannot put right:
- Structural movement, which needs a surveyor or engineer
- Damp that isn’t coming from the joint
- Failed render or damaged cladding panels
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think.
Surfaces we seal
- Render & cladding joints
- Copings & trims
- Façade panels
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
What the job involves on each surface
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joints work hard every day. We choose the product to suit.
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap so the sealant isn’t too deep.
What affects the cost of external mastic
We do not publish a price list. What we look at:
- How many areas need sealing
- How easy the joints are to reach
- The product the joint needs
- Whether there’s mould to deal with
What you pay reflects the work, not guesswork. That’s why we ask about the job first.
Asking for a quote
Photos help, but a description is a good start. Please mention:
- The problem you’ve noticed
- If it’s domestic, commercial or a hotel
- The address or postcode of the job
- How many joints, rooms or windows are involved
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we will take it from there.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.