East Sussex · England
John's Cross External Mastic
Problem with your movement joints in John's Cross? We remove the old material, prepare the joints and seal them properly.
- Joints with sealant missing in places
- Old sealant gone brittle and cracked
- Sealant that has lost its bond to the brick or render
External mastic for homes and businesses in John's Cross
Joints in render and cladding are easy to overlook until a damp patch appears. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product. If you are dealing with damp patches traced to an open external joint and panel joints letting water in, we can help.
External sealant needs dry, clean surfaces, so work around John's Cross is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- John's Cross (TN32)
- Wider area
- East Sussex
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. In total, it usually takes a few hours for a handful of joints, longer for a whole elevation. In a small place like John's Cross, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Let us know about parking restrictions
- Let us know about stairs, lifts or work at height
- Tell us about any water getting in
How to get a quote
For external mastic in John's Cross, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Read more
What affects the cost of external mastic
You’ll get a clear quote before we start. It’s based on:
- How many rooms, windows or areas are involved
- Any mould that needs treating
- When we can work, for business premises
- Which sealant suits the joint
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs. Ask us for a quote and we will explain what it covers.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- A few photos by email, if you can
- Whether it has been sealed before
- How we’d reach the joints
- The type of property
Every job is quoted individually. Simply call 0345 464 0079 or email us and describe the job and send pictures if you have them.
Honest limits
New sealant can’t fix everything, and we will tell you before work begins. It will not solve:
- Failed render or damaged cladding panels
- Damp that is not coming from the joint
- Cracked brickwork or render that needs a builder or plasterer
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
What we seal
- Joints between brick and frames
- Concrete & block
- Façade panels
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
Keeping the joints in good condition
So the new joints stay in good condition:
- Tell anyone working on the walls about the movement joints
- Have failed joints looked at early
- Deal with leaking gutters that soak the joints below
- Keep high-pressure jets off the joints
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years.
What the job involves on each surface
Joints between dissimilar materials
Each side of the joint may need its own preparation. Both surfaces are cleaned and primed as the product requires.
Copings and trims
A failed coping joint lets water into the top of the wall. Resealing them is a small job that protects a lot.
Why deal with it now?
Water gets in through a failed movement joint, behind render and cladding. 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 John's Cross, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why us?
- Experience in homes, commercial sites and hotels
- We are fully insured
- Approved under the ARBOMaster scheme
- A 12-month guarantee on all work
Common questions in John's Cross
Do you work for landlords with property near Robertsbridge station?
Yes. We work for letting agents and landlords as well as householders, and several properties can go on one quote. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Can you do external mastic in John's Cross?
Yes, John's Cross is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
Why is there a gap in my brick wall?
It’s a deliberate gap that lets the wall expand and contract without cracking. It’s sealed with a flexible sealant, not mortar.
Where are you based?
We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Can you seal joints between two different materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so the joint between them must be flexible. We choose one that suits both surfaces.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
Do you have insurance?
Yes. We are fully insured for every job we do.
When to call us in John's Cross
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it can’t stretch and tears as soon as the joint widens.
These are the problems we’re asked about most:
- Joints pointed up with cement by mistake
- Gaps where render, brick and frames meet
- Moss and dirt in joints with no sealant left
- Weathered mastic that no longer stretches
Rented homes near Robertsbridge station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
What to look for in a quote
- How hidden problems are handled
- How the joint is cleaned and prepared
- How long the guarantee is
- Which sealant they’ll use, and why
External mastic in John's Cross: local notes
With historic houses such as Durhamford Manor (about 2.1 miles south-east) nearby, there’s older building stock in the area around John's Cross as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In the older streets around The Parish Church of All Saints, an extension built onto an older house moves differently, and the joint between them takes the strain. If you look after a building such as Vinehall School, its movement joints, gutters and trims need looking after like any other building’s.
John's Cross is about 7 miles north-west of Hastings, in East Sussex. From the centre of John's Cross to the outskirts, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Our East Sussex coverage runs to 289 places, and John's Cross is one of them. For nearby work, see our Brighton page.
We cover every part of TN32 for external mastic. Whether your property is on Vinehall Road and John's Cross Road or a nearby road, our applicators can take on the job. Neighbouring places we cover for external mastic include Mountfield (1 mile south-west), Robertsbridge (2 miles north-west), Northbridge Street (2 miles north), Salehurst (2 miles north) and Netherfield (2 miles south-west). We also work in nearby towns such as Eastbourne (15 miles south-west), Hastings (7 miles south-east), Bexhill-on-Sea (8 miles south), Hailsham (12 miles south-west), Crowborough (15 miles north-west) and St Leonards (8 miles south).
What’s near John's Cross
Typical jobs here are in homes near John's Cross Public House and Robertsbridge Community College. The nearest railway station is Robertsbridge station, about 1.7 miles north-west of the centre. A little further out are Battle Museum of Local History (3.2 miles south). Not far away are Senlac Hill.