Kent · England
Southernden External Mastic
Our applicators work in Southernden on sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Water getting into walls through failed joints
- Movement joints filled with mortar instead of sealant
- Brick movement joints where the sealant has split
Aftercare tips
Aftercare is simple, and it makes a real difference:
- Have failed joints looked at early
- Keep high-pressure jets off the joints
- Walk round the building once a year and look at the joints
- Check the sealant is paintable before painting near it
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
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.
How we handle external mastic in Southernden
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement where a rigid filler would soon crack. If you have panel joints letting water in and water getting into walls through failed joints, we can help, on joints between brick and frames, façade panels and copings & trims alike.
In a village or hamlet like Southernden, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
There’s a 12-month guarantee on every job.
- Place
- Southernden (TN27)
- Region
- Kent
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Signs you need external mastic in Southernden
Sometimes a movement joint was filled with mortar or a rigid filler, often by someone who didn’t know what it was for. The joint cannot move, so the wall cracks somewhere else instead.
The most common problems we see are:
- Damp patches traced to an open external joint
- Joints pointed up with cement by mistake
- Sealant that has lost its bond to the brick or render
- Gaps where render, brick and frames meet
Historic houses such as Leeds Castle, about 4.8 miles north, show how far back building around Southernden goes, and older homes nearby need a sealant that suits their walls.
Comparing quotes
- How hidden problems are handled
- Whether the sealant suits the joint
- Whether you can choose the colour
- Whether all the old sealant comes out first
Landlord and commercial work in Southernden
Hotels need rooms back in use, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
How the visit works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes anything from a few hours to several days, depending on the building from start to finish. For a village or hamlet like Southernden, the journey is planned in advance: 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.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Let us know about parking restrictions
- Clear items away from the joints we are working on
- Let us know about earlier repairs to the joints
Get a quote
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
Read more
When something else is needed
We won’t take on work that won’t last, so these are the limits:
- Damp that is not coming from the joint
- Loose or hollow render, which needs re-rendering
- Movement that’s more than a sealant joint can take
If you’re not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer before booking.
Surfaces we seal
- Render & cladding joints
- Copings & trims
- Brickwork movement joints
- Façade panels
- Concrete & block
- Joints between brick and frames
Nearby places to Southernden
Other services in Southernden
Outside joints around Southernden
With historic houses such as Leeds Castle (about 4.8 miles north) nearby, there’s older building stock in the area around Southernden as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. 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.
Rented homes near Headcorn station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Southernden is about 8 miles south-east of Maidstone, in Kent. We carry out external mastic for homes and businesses in Southernden and nearby, as part of our work across Kent. We cover 922 towns and villages across Kent, large and small. You can also see our page for Crawley, roughly 37 miles from Southernden.
Jobs for external mastic in TN27 is quoted and booked the same way as anywhere else. Other places close to Southernden include Swift's Green (1 mile south), Smarden Bell (2 miles south), Headcorn (2 miles south-west), Hearnden Green (2 miles west) and Biddenden Green (2 miles south-east). Larger places within reach include Maidstone (8 miles north-west), Ashford (9 miles east), Sittingbourne (11 miles north), Faversham (13 miles north-east), Kings Hill (13 miles north-west) and Davington (13 miles north-east).
Local landmarks in Southernden
The closest station to Southernden is Headcorn station, roughly 2.1 miles south-west of the centre. Nearby you will also find Coldbridge Castle (1.7 miles north-east) and Kent Firefighting Museum (3.8 miles south-west).
Why it’s worth doing now in Southernden
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and does not last so it’s worth doing right. Older cottages and farmhouses around Southernden can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Doing several joints on one visit normally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We’ll give you a clear quote for the lot.
What you get with us
- Old sealant always removed completely
- White, clear, grey or another colour, product permitting
- More than 20 years in sealant work
- 180+ five-star Google reviews
Common questions in Southernden
Will you come out to Southernden?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Is Southernden in your area for external mastic?
Yes, Southernden is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll give you a clear quote.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses and we’re fully insured.
What do you need from me for a quote?
The location, the problem and the rough size of the job. Photos by email help too.
Where are you based?
Mr Mastic is based in Crawley. We cover Southernden and the rest of Kent.
Are you insured?
Yes. Mr Mastic is fully insured.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected, and the area is left clean when we finish.
I’m a tenant. Can you help?
We are happy to deal with the tenant, landlord or agent. Just make sure your landlord agrees.
How the job changes by surface
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible.
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. We prime where the sealant needs it before sealing.