West Sussex · England
External Mastic in Crabtree
External mastic across Crabtree and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Joints with sealant missing in places
- Joints where the bead has come unstuck
- Plants rooting in failed movement joints
External mastic in Crabtree, done properly
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we’ll confirm what access is needed. If you’re dealing with cracked joints where brick meets render or frames and damp patches traced to an open external joint, we can put it right.
Older homes in small places like Crabtree may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
All of our work is guaranteed for twelve months, in Crabtree and everywhere else we cover.
- Place
- Crabtree (RH13)
- Region
- West Sussex
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
The process
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes anything from a few hours to several days, depending on the building and we leave things clean and tidy. For a village or hamlet like Crabtree, the journey is planned in advance: 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 start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Let us know if you’ve seen damp or leaks
- Let us know about earlier repairs to the joints
- Tell us if parking is tricky
Ask for a quote
Want a quote for external mastic? Please ring 0345 464 0079 or email us with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Advice
What affects the quote in Crabtree
For a quick quote, just ask. The main things that affect it are:
- How much there is to do
- The old material and how stubborn it is
- Which sealant suits the joint
- Any working-time requirements on site
The cost depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. We give a clear quote before we start.
Helping us quote
To help us quote quickly, let us know:
- Where the job is, and your postcode
- How we’d reach the joints
- If someone has resealed it before
- The type of property
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job.
Nearby places to Crabtree
What else we do in Crabtree
Outside joints around Crabtree
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Tyes Place (about 4.3 miles north-east) are a reminder that the area around Crabtree has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
For an older house near a landmark such as Old Church House the Glebe, old and new materials meet at the roofline and walls, which is where sealant earns its keep. For landlords with property near Horsham station, outside joints that have cracked can let damp into a rental, so check them between lets.
Crabtree is about 5 miles south-east of Horsham, in West Sussex. Our applicators cover external mastic for homes and businesses in Crabtree, as part of our work across West Sussex. 371 places in West Sussex are on our list, from the larger towns to small villages. For nearby work, see our Crawley page, about 7 miles away.
Work in RH13 is quoted and booked the same way as anywhere else. That includes homes and businesses on Mill Lane, Peppersgate and Long Hill. Nearby, we also carry out external mastic in Lower Beeding (1 mile north), Colwood (1 mile south-east), Monk's Gate (2 miles north-west), Plummers Plain (2 miles north-east) and Mannings Heath (2 miles north-west). We also work in nearby towns such as Crawley (7 miles north-east), Horsham (5 miles north-west), Worthing (14 miles south-west), Haywards Heath (7 miles east), Burgess Hill (7 miles south-east) and East Grinstead (13 miles north-east).
What’s near Crabtree
Around Crabtree, our work takes us to homes and buildings near Leonardslee. The closest station to Crabtree is Horsham station, roughly 4.6 miles north-west of the centre. Other landmarks nearby include Horsham Hospital (4.9 miles north-west). The countryside around Crabtree includes Knepp Wildland.
Common problems we fix in Crabtree
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
The most common problems we see are:
- Brick movement joints where the sealant has split
- Weeds or debris growing in open joints
- Failed sealant between panels on a façade
- Damp patches traced to an open external joint
For site and facilities teams at buildings such as Newells Preparatory School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Before booking anyone
- How the surfaces are prepared before sealing
- What the quote includes, VAT included or not
- How hidden problems are handled
- What the cure time is
FAQs for Crabtree
Do you work for landlords with property near Horsham station?
Yes. We work for landlords and letting agents as well as householders. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Is Crabtree within the area you cover?
Yes. Crabtree is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Is the work guaranteed?
Yes, for a year. If there’s a problem with our work in that time, tell us and we’ll put it right.
Can you match the colour of my brickwork?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin, matched as closely as the range allows.
Can you seal joints between render and window frames?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. The sealant is matched to both sides.
How often do external joints need resealing?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year and reseal when it splits.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
Honest limits
We will not take on work that will not last, so here’s what sealant can’t put right:
- Structural movement, which needs a surveyor or engineer
- Damp that isn’t coming from the joint
- Cutting new joints into brickwork, which is building work rather than sealant work
If you are not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
Where we work in Crabtree
- Joints between brick and frames
- Façade panels
- Copings & trims
- Concrete & block
- Brickwork movement joints
- Render & cladding joints
DIY sealant or a professional job?
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Why it’s worth doing now in Crabtree
A failed movement joint lets water into the wall. Dealing with it early keeps the repair to the joint, rather than the wall around it. Where a wall is exposed, as many are in small places like Crabtree, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Doing several joints on one visit normally makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll send you a clear quote for the lot.
Why choose Mr Mastic in Crabtree
- Domestic, commercial and hotel work
- Sanitary silicone with an anti-fungal additive in wet areas
- We never seal over old sealant
- An ARBOMaster approved applicator
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will give you a quote.