West Sussex · England
External & façade joints in Hammerwood, West Sussex
Movement joints in Hammerwood need attention? We remove the old material, prepare the joints and seal them properly.
- Hard, crazed mastic that has stopped moving
- Movement joints filled with mortar instead of sealant
- Sealant pulling away from one side of the joint
Questions from Hammerwood
Is Hammerwood in your area for external mastic?
Yes. We work across London and the South East, and Hammerwood is part of that. You can ring 0345 464 0079 or send us an email and let us know what needs doing.
Do you cover smaller places like Hammerwood?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Should I point up the gap in my brickwork?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Do you remove the old sealant?
Yes, always, and completely. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Why is there a gap in my brick wall?
Brickwork, render and cladding all move a little, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
Can you seal over the old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
External mastic in Hammerwood, 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. If you have sealant pulling away from one side of the joint and moss and dirt in joints with no sealant left, we can put it right, on façade panels, concrete & block and joints between brick and frames alike.
External sealant needs dry, clean surfaces, so work around Hammerwood is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Where
- Hammerwood (RH19)
- Wider area
- West Sussex
- Cover
- One year on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Deal with leaking gutters that soak the joints below
- Ask before painting over external sealant
- Get split or bare joints resealed while the damage is small
- Check external joints each spring
Avoid pressure-washing straight into the joints. A strong jet can damage the edges of the bead and let water in behind.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years, so it’s worth resealing at the first signs.
Why act early in Hammerwood
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. Where a wall is exposed, as many are in small places like Hammerwood, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or email us.
What you get with us
- Anti-fungal sanitary silicone in wet areas
- Full insurance on every job
- 4.9 on Google from 180+ five-star reviews
- White, clear, grey or another colour, product permitting
See what affects the cost and customer reviews.
Work for landlords, hotels and businesses
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
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.
How the visit works
At the end, we look at the finished work together and explain the cure time. The work normally takes anything from a few hours to several days, depending on the building, depending on the size of the job. Somewhere as small as Hammerwood, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- On commercial sites, let us know about site rules
- Tell us about any previous sealing or DIY attempts
Ask for a quote
Need a quote? Please ring 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
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Towns and villages near Hammerwood
Other services in Hammerwood
Hammerwood buildings and the weather
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Hammerwood Park (about 0.8 miles south-east) are a reminder that the area around Hammerwood has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
If you look after a building such as Sackville School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Homes close to Church of St Stephen include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Hammerwood is about 3 miles east of East Grinstead, in West Sussex. From the centre of Hammerwood to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our West Sussex coverage runs to 371 places, and Hammerwood is one of them. You can also see our page for Crawley, roughly 10 miles from Hammerwood.
Work in RH19 works the same way as everywhere else we cover. We also cover the places around Hammerwood: Ashurst Wood (2 miles south-west), Cowden (2 miles east), Dormansland (2 miles north-west), Dormans Park (2 miles west) and East Grinstead (3 miles west). Larger places within reach include Crawley (10 miles west), Haywards Heath (11 miles south-west), Burgess Hill (15 miles south-west), Broadfield (11 miles west), Bewbush (12 miles west) and Southgate (10 miles west).
Local landmarks in Hammerwood
The closest station to Hammerwood is Dormans station, roughly 2.4 miles north-west. Other landmarks nearby include Bolebroke Castle (2.9 miles south-east) and East Grinstead Museum (2.4 miles south-west). Open spaces near Hammerwood include Hedgecourt Lake.
Quotes for external mastic in Hammerwood
The price is agreed before any work begins. It’s based on:
- Whether old sealant or filler has to be cut out
- The size of the job
- Any working-time requirements on site
- Access and height
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we will explain the quote if you ask.
What we need to know
What to tell us when you ask for a quote:
- What the problem is, such as mould, gaps, leaks or cracking
- A few photos by email, if you can
- Where the job is, and your postcode
- Roughly how big the job is
If you’re in Hammerwood and need external mastic, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
What we’re called out for in Hammerwood
Some movement joints have been pointed up with mortar by mistake. The joint can’t move, so the wall cracks somewhere else instead.
Keep an eye out for these signs:
- Leaking joints around cladding and façade panels
- Plants rooting in failed movement joints
- Failed seals between different materials
- Rigid filler in a joint that should flex
If you let a flat or house near Dormans station, outside joints that have cracked can let damp into a rental, so check them between lets.
Before booking anyone
- When the joint can take water or movement
- What the quote includes, VAT included or not
- Whether the sealant suits the joint
- How hidden problems are handled
Different surfaces, different methods
Render joints
Render has movement joints and stop beads that need sealing. They’re resealed in a sealant that suits the render.
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible year round.