Kent · England
Walter's Green External Mastic
External mastic for Walter's Green, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Plants rooting in failed movement joints
- Joints pointed up with cement by mistake
- Cracked joints where brick meets render or frames
How we handle external mastic in Walter's Green
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, so it bonds to the two sides only and can stretch. Typical jobs include old sealant gone brittle and cracked and leaking joints around cladding and façade panels, across façade panels, brickwork movement joints and render & cladding joints.
Older homes in small places like Walter's Green may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water generally gets in.
Each job carries a 12-month guarantee.
- Place
- Walter's Green (TN11)
- Region
- Kent
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How it works
On the day, there’s very little for you to do. Show us the job and we will take it from there. The job generally takes a few hours to a few days, depending on the length of joint and the access from start to finish. Somewhere like Walter's Green needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. 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.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Mention any parking rules near the property
- Let us know about stairs, lifts or work at height
Get a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Related advice
Also near Walter's Green
What else we do in Walter's Green
Walter's Green questions
Do you cover smaller places like Walter's Green?
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.
Can you do external mastic in Walter's Green?
Yes, Walter's Green is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job.
Can you seal over the old sealant?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Is it OK to fill a movement joint with cement?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. We’ll reseal it with a flexible sealant.
Are you fully insured?
Yes. We are fully insured.
Will there be a smell?
Sometimes, a little. It fades as the sealant cures.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
How long will you be here?
A typical job takes a few hours for a handful of joints, longer for a whole elevation, including preparation and clearing up. Your quote will say how long we expect yours to take.
When to call us in Walter's Green
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall and speed up the damage.
It’s worth asking for a quote if you see:
- Moss and dirt in joints with no sealant left
- Panel joints letting water in
- Cracked joints where brick meets render or frames
- Hard, crazed mastic that has stopped moving
If you let a flat or house near Ashurst Kent station, split movement joints are easy to miss on a rental until damp shows inside.
Comparing quotes
- The length of the guarantee
- Is the old sealant removed completely?
- What the cure time is
- What happens if the job turns out different
What happens if it’s left?
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. In a small place like Walter's Green, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and agree the price before starting.
Why us?
- We leave the area clean and tidy
- Trusted Arbo and Everbuild sealants
- Sanitary silicone with an anti-fungal additive in wet areas
- A choice of colours where the product allows
What affects the cost of external mastic
We quote each job individually. This is what makes a difference:
- Whether old sealant or filler has to be cut out
- The product the joint needs
- Whether there’s mould to deal with
- How much there is to do
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Where the job is, and your postcode
- Photos by email, if that’s easy
- Any previous sealing or DIY work
- The type of property
Want a quote for external mastic? Please call 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.
Outside joints around Walter's Green
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Penshurst Place (about 2.1 miles north-east) nearby, there’s older building stock in the area around Walter's Green as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Schools such as Fordcombe Church of England Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. For an older house near a landmark such as Church of St Peter, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Walter's Green is about 5 miles west of Royal Tunbridge Wells, in Kent. Across the TN11 area, we cover external mastic for homes and businesses. We cover 922 towns and villages across Kent, large and small. There’s also a page for Crawley, about 15 miles away.
Every address in TN11 is within our area for external mastic, from the main roads to the quietest streets. Neighbouring places we cover for external mastic include Fordcombe (1 mile south-east), Teasley Mead (1 mile south-west), Ashurst (1 mile south), Stone Cross (1 mile south-east) and Chiddingstone Hoath (1 mile north-west). Larger places within reach include Sevenoaks (9 miles north), Royal Tunbridge Wells (5 miles east), Tonbridge (6 miles north-east), Kings Hill (14 miles north-east), Paddock Wood (10 miles east) and Southborough (4 miles east).
Landmarks near Walter's Green
Typical jobs here are in homes near Bottle House Inn. Walter's Green’s nearest station is Ashurst Kent station, roughly 1.3 miles south. Well-known places in the area include Chiddingstone Castle (2.8 miles north) and Kent and Sussex Hospital (4.3 miles east). Open spaces near Walter's Green include Broadwater Warren RSPB Reserve.
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Looking after it afterwards
Good habits help new joints last longer. A few tips:
- Walk round the building once a year and look at the joints
- Keep water from gutters off the wall
- Tell anyone working on the walls about the movement joints
- Keep movement joints as flexible joints, not mortar
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges and let water in behind.
Act while the splits are small. Then it’s a straightforward cut-out and reseal.
What sealant work can’t fix
New sealant cannot fix everything, and we will tell you before work begins. It won’t solve:
- Movement that’s more than a sealant joint can take
- Cracks in the bricks or render themselves, away from the joints
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
- Façade panels
- Copings & trims
- Joints between brick and frames