East Sussex · England
External & façade joints in Mark Cross, East Sussex
We cover Mark Cross for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and a one-year guarantee.
- Moss and dirt in joints with no sealant left
- Panel joints letting water in
- Joints pointed up with cement by mistake
External mastic for homes and businesses in Mark Cross
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. We’re often asked to deal with damp patches traced to an open external joint and gaps where render, brick and frames meet, across brickwork movement joints, copings & trims and render & cladding joints.
Older homes in small places like Mark Cross may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water generally gets in.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Place
- Mark Cross (TN6)
- Region
- East Sussex
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Signs you need external mastic in Mark Cross
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The new sealant then lets go long before it should.
It’s worth asking for a quote if you see:
- Moss and dirt in joints with no sealant left
- Brick movement joints where the sealant has split
- Leaking joints around cladding and façade panels
- Joints where the bead has come unstuck
If you look after a building such as Mark Cross Church of England Aided Primary School, its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- What the quote includes, VAT included or not
- Is the old sealant removed completely?
- What happens if they find a problem under the old sealant
- How long the guarantee is
How the visit works
Once we are on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes anything from a few hours to several days, depending on the building. Somewhere like Mark Cross needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- 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 earlier repairs to the joints
- Mention any sign-in or site rules at work premises
Ask for a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we’ll explain what’s involved and give you a clear quote.
Read more
Leave it or put it right?
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and doesn’t last. Where a wall is exposed, as many are in small places like Mark Cross, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
Why us?
- Colour agreed with you before we start
- White, clear, grey or coloured to suit, where the product allows
- Colour picked to suit the job
- One-year guarantee on every job
Take a look at how sealant jobs are priced and our reviews.
How we quote for external mastic
Every job gets its own quote. These are the things that affect it:
- Whether there’s mould to deal with
- The size of the job
- Which sealant suits the joint
- Working hours on commercial sites
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or drop us an email and we will talk you through it.
Helping us quote
To help us quote quickly, let us know:
- A few photos by email, if you can
- How we’d reach the joints
- Where the job is, and your postcode
- Roughly how big the job is
We quote each job on its own, so start by telling us what you need. Simply call 0345 464 0079 or send us an email and describe the job, and photos are welcome.
Looking after it afterwards
Aftercare is simple:
- Keep water from gutters off the wall
- Leave the joints unpainted unless we have said otherwise
- Get split or bare joints resealed while the damage is small
- Look over the joints every year, ideally after winter
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick which cost more to put right than the joint.
Places near Mark Cross
What else we do in Mark Cross
Different surfaces, different methods
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant in a colour to suit the brick.
Render joints
Render has movement joints and stop beads that need sealing. We reseal them with a flexible exterior sealant that suits the render colour.
For landlords and businesses
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured for the work.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Outside joints around Mark Cross
Historic houses like Wadhurst Castle (about 3.2 miles east) are a reminder that the area around Mark Cross has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. 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.
Homes close to St Marks include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep. Rented homes near Wadhurst station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Mark Cross is about 4 miles east of Crowborough, in East Sussex. Mark Cross gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Mark Cross is one of 289 towns and villages in East Sussex where we work. There’s also a page for Crawley, roughly 20 miles from Mark Cross.
Here we cover the TN6 postcode area for external mastic. Other places close to Mark Cross include Town Row (1 mile south-west), The Platt (2 miles north), Argos Hill (2 miles south-west), Rotherfield (2 miles south-west) and Rusher's Cross (2 miles south-east). Within a short drive, we also cover Hailsham (14 miles south), Crowborough (4 miles west), Uckfield (9 miles south-west), Heathfield (7 miles south), Upper Horsebridge (13 miles south) and Hellingly (12 miles south).
Near you in Mark Cross
We work in homes and buildings around Eridge Park, The Lazy Fox pub and St Joseph Seminary and the streets around them. The nearest railway station is Wadhurst station, roughly 2.5 miles east. Well-known places in the area include Crowborough War Memorial Hospital (4.4 miles west). Not far away are Crowborough Country Park.
Your questions about external mastic in Mark Cross
Do you cover Mark Cross for external mastic?
Yes. We work across London and the South East, and Mark Cross is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear quote.
Is Mark Cross within the area you cover?
Yes. Mark Cross is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is there a guarantee?
Yes, always. Each job is guaranteed for twelve months.
Can new sealant go over the old?
No, and we never do. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
What colours does the sealant come in?
We aim for a joint that suits the wall rather than one that jumps out. Colour is agreed with you before we begin from the range available.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area.
How much does external mastic cost in Mark Cross?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before work begins.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Pointing it stops it working and can lead to cracking. We’ll reseal it with a flexible sealant.