West Sussex · England
External & façade joints in Cross Gate, West Sussex
External mastic for Cross Gate, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Hard, crazed mastic that has stopped moving
- Sealant pulling away from one side of the joint
- Rain getting behind render or cladding at a joint
Looking after it afterwards
Simple care keeps the joints in good condition. Our advice:
- Wash walls gently around the sealant
- Deal with leaking gutters that soak the joints below
- Point out the joints to other trades
- Keep soil, plants and ivy away from the joints
Follow the cure time we give you before the joint is knocked or disturbed. Most exterior sealants skin fast but take longer to cure right through.
Small splits are the time to act. At that stage it’s a simple cut out and reseal with no damage behind it to deal with.
External mastic in Cross Gate, done properly
On houses, flats and commercial buildings across Cross Gate, we reseal joints in brickwork, render, cladding and façade panels. Every joint gets the same careful preparation: clean joint faces and the right depth. Typical jobs include failed sealant between panels on a façade and rigid filler in a joint that should flex, on copings & trims, concrete & block and brickwork movement joints.
Somewhere as small as Cross Gate, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or drop us an email.
- Where
- Cross Gate (BN18)
- Region
- West Sussex
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How we quote for external mastic
The price is agreed before any work begins. It’s based on:
- How many areas need sealing
- Working hours on commercial sites
- How easy the joints are to reach
- How much there is to do
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- How we’d reach the joints
- A few photos by email, if you can
- The type of property
- The address or postcode of the job
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand, and we will come back to you with a quote.
When to call us in Cross Gate
Sometimes a movement joint was filled with mortar or a rigid filler by mistake. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
If you can see any of these, it’s time to have the joints looked at:
- Gaps where render, brick and frames meet
- Hard, crazed mastic that has stopped moving
- Moss and dirt in joints with no sealant left
- Failed sealant between panels on a façade
Letting a property close to Amberley station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Questions to ask before you book
- How the colour is chosen
- How hidden problems are handled
- How the surfaces are prepared before sealing
- Is the old sealant removed completely?
Nearby places to Cross Gate
More services for Cross Gate
For landlords and businesses
We work for letting agents and landlords as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
What happens on the day
Before we leave, we go over the finished joints with you and tell you how long to leave it. The visit itself usually takes anything from a few hours to several days, depending on the building, depending on the size of the job. Somewhere like Cross Gate needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- 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.
Before we arrive
- Let us know about parking restrictions
- Mention any leaks or damp you’ve noticed
- Try not to wet indoor joints just before the visit
Get a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or drop us an email.
Read more
Outside joints around Cross Gate
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. With historic houses such as Parham House (about 1.1 miles east) nearby, there’s older building stock in the area around Cross Gate as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
If you look after a building such as Amberley CofE Primary School, larger buildings have long runs of movement joint that eventually need resealing. For an older house near a landmark such as The Parish Church of St Michael and All Angels, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Cross Gate is about 7 miles north of Littlehampton, in West Sussex. Every kind of property in Cross Gate can book us for external mastic. The work is guaranteed for a year. Our area takes in 371 places across West Sussex, from the larger towns to small villages. Our Brighton page covers work nearby.
All of BN18 is covered for external mastic, from the main roads to the quietest streets. Close by, we work in Rackham (1 mile east), Amberley (1 mile south-west), Bury (2 miles west), Coldwaltham (2 miles north-west) and Watersfield (2 miles north-west). Larger places within reach include Horsham (14 miles north-east), Worthing (8 miles south-east), Bognor Regis (11 miles south-west), Chichester (12 miles south-west), Littlehampton (7 miles south) and Shoreham-by-Sea (12 miles south-east).
What’s near Cross Gate
We work in homes and buildings around Parham Park. The nearest railway station is Amberley station, roughly 1.5 miles south-west. Other landmarks nearby include Amberley Museum (1.4 miles south-west) and Amberley Castle (1 mile west). Not far away are Bignor Hill and Amberley Wild Brooks.
Why deal with it now?
Water gets in through a failed movement joint, behind render and cladding. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. Older cottages and farmhouses around Cross Gate can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you’re unsure, call 0345 464 0079 or email us and we will give you an honest view and a quote.
Why Cross Gate customers choose us
- Homes, businesses and hotels
- White, clear, grey or coloured to suit, where the product allows
- Fully insured
- 20+ years of sealant experience
See what affects the cost and our reviews.
Questions from Cross Gate
Do you cover Cross Gate for external mastic?
Yes. We work across London and the South East, and Cross Gate is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.
Do you cover smaller places like Cross Gate?
Yes. Cross Gate is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Do you work for letting agents?
Yes, regularly. We can quote for several properties at once.
Will you leave a mess?
Tidy work is part of the job. Nearby surfaces are protected, and the area is left clean when we finish.
How long does the job take?
That depends on how much there is to do, but as a guide it takes a few hours for a handful of joints, longer for a whole elevation. We will tell you when we quote.
Can you seal joints between render and window frames?
Yes. Different materials move at different rates, so the joint between them must be flexible. We choose one that suits both surfaces.
Does someone need to be in?
That depends on where the joints are. Inside work needs someone to give us access.
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- Structural movement, which needs a surveyor or engineer
- Render that’s blown, hollow or coming away
- Cracks in the bricks or render themselves, away from the joints
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly before booking.
Surfaces we seal
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
- Façade panels