Kent · England
External Mastic in Cudham
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Cudham. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Old sealant gone brittle and cracked
- Failed sealant between panels on a façade
- Joints with sealant missing in places
Surface by surface
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so its sealant has to stay flexible.
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. Each is resealed with a weatherproof, flexible sealant.
About our external mastic in Cudham
A movement joint is a deliberate break that lets a wall expand and contract. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. We work on copings & trims, joints between brick and frames and render & cladding joints, and common reasons people get in touch are cracked joints where brick meets render or frames and joints with sealant missing in places.
Around Cudham, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
Every job comes with a one-year guarantee, wherever you are in Kent.
- Place
- Cudham (TN14)
- Region
- Kent
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Places near Cudham
Other services in Cudham
What affects the quote in Cudham
The price is agreed before any work begins. It takes into account:
- The product the joint needs
- The size of the job
- Any mould that needs treating
- Working hours on commercial sites
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you are not sure whether it needs doing, call 0345 464 0079 or email us for an honest opinion and a quote.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- Where the job is, and your postcode
- Whether it’s a home or a business
- Photos by email, if that’s easy
- Roughly how big the job is
If you’re in Cudham and need external mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before work begins.
What we do, step by step
We bring everything the job needs with us, so you don’t need to buy or prepare anything. Once we’ve agreed what’s being done, the area is protected and the work begins. Most jobs take anything from a few hours to several days, depending on the building. For a village or hamlet like Cudham, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We look at every joint and agree a colour to suit the wall.
- 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.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Mention any tricky access
- On commercial sites, let us know about site rules
- Plan for the work area to be out of bounds to pets and children
Ask for a quote
Asking for a quote is easy: let us know the job and the location and its rough size. Photos by email help us understand the job.
Related advice
Walls and rooflines in Cudham
With historic houses such as Down House (about 1.4 miles north-west) nearby, there’s older building stock in the area around Cudham 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In the older streets around Church of St Peter and St Paul, an extension built onto an older house moves differently, and the joint between them takes the strain. For landlords with property near Chelsfield station, split movement joints are easy to miss on a rental until damp shows inside. Schools such as Cudham Church of England Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Cudham is about 5 miles south of Orpington, in Kent. Whether you are in the middle of Cudham or further out, external mastic is available for homes and businesses alike. Our area takes in 922 places across Kent. London is on our list too, about 15 miles from Cudham.
We cover every part of TN14 for external mastic and the streets around it. If you need external mastic at a property on Cudham Lane South, Cacket's Lane and Newbarn Lane or anywhere close by, we can help. Close by, we work in Single Street (1 mile west), Berry's Green (1 mile south-west), Horns Green (1 mile south-east), Burlings (1 mile south-east) and Luxted (1 mile north-west). Within a short drive, we also cover Dartford (11 miles north-east), Sevenoaks (5 miles south-east), Royal Tunbridge Wells (15 miles south-east), Gravesend (15 miles north-east), Tonbridge (12 miles south-east) and Northfleet (14 miles north-east).
Landmarks near Cudham
Typical jobs here are in homes near Charles Darwin School and The Blacksmith's Arms. The nearest railway station is Chelsfield station, about 3.1 miles north-east. A little further out are Orpington Hospital (3.3 miles north) and Crofton Roman Villa (3.9 miles north). Open spaces near Cudham include Downe Bank and Betsom's Hill.
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Fix overflowing gutters above sealed joints
- Check the sealant is paintable before painting near it
- Avoid pressure-washing directly into sealant joints
- Have failed joints looked at early
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Small splits are the time to act. At that stage it’s a simple cut out and reseal.
Cudham: your questions answered
Is Cudham in your area for external mastic?
Yes. Our work covers London and the South East, and Cudham is part of that. Just call 0345 464 0079 or email us with a few details of the job.
I let a flat near Chelsfield station. Can you help?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Are you fully insured?
Yes. Full insurance covers our work.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used.
Do you use backing rod?
That is backing rod, a closed-cell foam. It stops the sealant going in too deep and bonding to three sides.
Is there any odour?
There can be a smell while the sealant cures, which fades as it sets. Opening a window helps.
How long does external mastic last?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Every job carries our 12-month guarantee.
Can you seal joints between render and window frames?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides, primed where needed.
When something else is needed
A few problems are outside what sealant work can do:
- Render that is blown, hollow or coming away
- Cracking across the wall rather than at a joint
- Subsidence or other structural problems
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
Surfaces we seal
- Concrete & block
- Façade panels
- Render & cladding joints
- Joints between brick and frames
- Copings & trims
- Brickwork movement joints
Landlord and commercial work in Cudham
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
We also work for property managers and facilities teams in Cudham and across Kent. Several sites can go on one quote, and we are fully insured.