West Sussex · England
Jacob's Post External Mastic
External mastic across Jacob's Post and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Leaking joints around cladding and façade panels
- Gaps where render, brick and frames meet
- Damp patches traced to an open external joint
What the job involves on each surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod coloured to suit the wall.
Joints between dissimilar materials
Different materials may need different primers. We prepare both faces so the sealant bonds properly.
External mastic in Jacob's Post, done properly
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a colour to suit. Typical jobs include sealant that has lost its bond to the brick or render and movement joints filled with mortar instead of sealant, on joints between brick and frames, façade panels and render & cladding joints.
In a village or hamlet like Jacob's Post, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
Every job is covered by a one-year guarantee.
- Where
- Jacob's Post (RH15)
- Region
- West Sussex
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Jacob's Post: your questions answered
Do you work for landlords with property near Burgess Hill station?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we will send you a clear quote.
Is Jacob's Post within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. We’ll talk through colour options before we start.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. The sealant is matched to both sides.
Is there any odour?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
How long should I leave it?
That depends on the sealant used, so please follow the time we give you when we finish.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
When will the joints need doing again?
That depends on the wall, the weather and the movement. Look for splits, hardening or edges coming away, and reseal at that point.
Walls and rooflines in Jacob's Post
Historic houses like Ockenden Manor (about 3.2 miles north) are a reminder that the area around Jacob's Post 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. 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.
Rented homes near Burgess Hill station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. For site and facilities teams at buildings such as The Gattons Infant School, its movement joints, gutters and trims need looking after like any other building’s.
Jacob's Post is about 1 mile west of Burgess Hill, in West Sussex. Every kind of property in Jacob's Post can book us for external mastic. Every job comes with our one-year guarantee. Across West Sussex, we cover 371 places, and Jacob's Post is one of them. You can also see our page for Brighton, about 9 miles away.
Postcode districts we cover here for external mastic: RH15. External mastic is available to properties on Downs Road, London Road and Western Road. Other places close to Jacob's Post include Burgess Hill (1 mile east), Abbotsford (1 mile north), World's End (1 mile east), Goddards Green (1 mile west) and Hurst Wickham (2 miles south-west). We also work in nearby towns such as Crawley (11 miles north), Horsham (11 miles north-west), Worthing (15 miles south-west), Haywards Heath (3 miles north-east), East Grinstead (13 miles north-east) and Shoreham-by-Sea (10 miles south-west).
Near you in Jacob's Post
We work in homes and buildings around The Cricketers pub, St Paul's Catholic College and Oakmeeds Community College and the streets around them. Jacob's Post’s nearest station is Burgess Hill station, about 0.7 miles south-east of the centre. A little further out are Burgess Hill Museum (0.5 miles south-east) and The Dene Hospital (1.2 miles west). For a walk, there’s Bedelands Farm Nature Reserve and Wolstonbury Hill.
Why deal with it now?
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render around the joint, so the problem grows beyond the joint itself. Older cottages and farmhouses around Jacob's Post can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint usually makes the job bigger, not smaller. If you are not sure whether it needs doing, call 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Why book with us
- 20+ years of sealant experience
- Neat joints and a tidy finish
- Domestic, commercial and hotel work
- 180+ five-star Google reviews
See our cost guide or our reviews.
For landlords and businesses
In hotels, rooms out of use cost money, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Signs you need external mastic in Jacob's Post
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
The most common problems we see are:
- Sealant that has lost its bond to the brick or render
- Joints pointed up with cement by mistake
- Rain getting behind render or cladding at a joint
- Moss and dirt in joints with no sealant left
In the older streets around Providence Strict Baptist Chapel, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Questions to ask before booking
- Whether they’re fully insured
- What happens if the job turns out different
- Who turns up on the day
- The length of the guarantee
Places near Jacob's Post
Also in Jacob's Post
What we do, step by step
We bring everything the job needs with us, so you don’t need to buy or prepare anything. Once we have agreed what’s being done, the area is protected and the work begins. Most jobs take anything from a few hours to several days, depending on the building. Somewhere as small as Jacob's Post, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
- Tell us about any water getting in
Getting a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved.
Related advice
Aftercare tips
To keep the joints looking good and working properly:
- Have failed joints looked at early
- Leave the joints unpainted unless we’ve said otherwise
- Tell anyone working on the walls about the movement joints
- Deal with leaking gutters that soak the joints below
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established.
Honest limits
Some problems need a builder, plumber or other trade rather than us:
- Rising or penetrating damp from elsewhere in the wall
- Loose or hollow render, which needs re-rendering
- Movement that is more than a sealant joint can take
If in doubt, call 0345 464 0079 or send us an email and we will say what we think before booking.
Where we work in Jacob's Post
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
- Concrete & block
- Façade panels
- Joints between brick and frames