Kent · England
External Mastic in Platt's Heath
External mastic for Platt's Heath and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Rigid filler in a joint that should flex
- Sealant that has lost its bond to the brick or render
- Rain getting behind render or cladding at a joint
External mastic for homes and businesses in Platt's Heath
For buildings in Platt's Heath, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean, sound faces and a controlled depth. We work on joints between brick and frames, façade panels and concrete & block, and people most often call us about moss and dirt in joints with no sealant left and old sealant gone brittle and cracked.
Older homes in small places like Platt's Heath may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
You are covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Location
- Platt's Heath (ME17)
- Wider area
- Kent
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Outside joints around Platt's Heath
With historic houses such as Leeds Castle (about 3 miles north-west) nearby, there’s older building stock in the area around Platt's Heath as well as newer homes. Where a home is older, 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.
Managing a site like Platts Heath Primary School? Then its movement joints, gutters and trims need looking after like any other building’s. For an older house near a landmark such as Church of St Nicholas, an extension built onto an older house moves differently, and the joint between them takes the strain.
Platt's Heath is about 7 miles south-east of Maidstone, in Kent. We carry out external mastic for homeowners, landlords and businesses in Platt's Heath and the surrounding area, as part of our work across Kent. Our Kent coverage runs to 922 places, and Platt's Heath is one of them. You can also see our page for Chelmsford, roughly 37 miles from Platt's Heath.
Jobs for external mastic in ME17 works the same way as everywhere else we cover. That includes homes and businesses on School Lane, Headcorn Road and Green Lane and the roads around them. Close by, we work in Liverton Street (1 mile south-west), Sandway (1 mile north-east), Boughton Malherbe (1 mile south-east), Fairbourne Heath (1 mile west) and Grafty Green (1 mile south). Within a short drive, we also cover Maidstone (7 miles north-west), Ashford (10 miles south-east), Sittingbourne (9 miles north), Faversham (11 miles north-east), Minster (14 miles north) and Kings Hill (13 miles west).
Near you in Platt's Heath
We work in homes and buildings around Kiln Wood, Wishful Thinker pub and The Lenham School, among other places. For rail, the closest station is Lenham station, roughly 1.2 miles north-east. Well-known places in the area include The Dog Collar Museum (2.9 miles north-west) and Coldbridge Castle (1.8 miles south).
When something else is needed
To be straight with you, some problems need a different trade:
- Walls that need new movement joints cut into them
- Cracking across the wall rather than at a joint
- Rising or penetrating damp from elsewhere in the wall
If you’re not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Copings & trims
- Façade panels
- Concrete & block
Common questions in Platt's Heath
Can you do external mastic in Platt's Heath?
Yes, Platt's Heath is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll give you a clear price.
I let a flat near Lenham station. Can you help?
Yes, we work for landlords and agents. You can phone 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
How long does external mastic last?
That depends on the wall, the weather and the movement. Look for splits, hardening or edges coming away.
Should I point up the gap in my brickwork?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. A flexible sealant is the right fill.
What colours does the sealant come in?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
Where do you work from?
We work from Crawley. Our applicators cover Platt's Heath, along with the rest of our area.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator and we’re fully insured too.
How we quote for external mastic
For a quick quote, just ask. What matters most is:
- The old material and how stubborn it is
- The product the joint needs
- How many areas need sealing
- The number and length of the joints
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
What we need to know
Photos help, but a description is a good start. Please mention:
- A few photos by email, if you can
- Whether it’s a home or a business
- How we’d reach the joints
- If someone has resealed it before
Want a quote for external mastic? Please phone 0345 464 0079 or email us with a few details. We will explain what we’d do and give you a clear price before any work starts.
DIY sealant or a professional job?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Nearby places to Platt's Heath
What else we do in Platt's Heath
How it works
When we arrive, we start by going over the job with you. We protect the surfaces around the joints before any work begins. Most jobs take a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Platt's Heath, 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.
- 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.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Mention any tricky access
- Tell us about any previous sealing or DIY attempts
How to get a quote
If you’re in Platt's Heath and need external mastic, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Advice
When to call us in Platt's Heath
The wrong product in a moving joint is a classic cause. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Common reasons people contact us are:
- Sealant that has lost its bond to the brick or render
- Weathered mastic that no longer stretches
- Movement joints filled with mortar instead of sealant
- Moss and dirt in joints with no sealant left
If you let a flat or house near Lenham station, outside joints that have cracked can let damp into a rental, so check them between lets.
What to look for in a quote
- Whether they’re fully insured
- How the joint is cleaned and prepared
- What guarantee comes with the work
- How long to leave it before use
What the job involves on each surface
Cladding and façade panels
If the façade has a specified sealant, that is what we use. Tell us what the building has when you get in touch.
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. We reseal their joints with backing rod and a flexible product.
Keeping the joints in good condition
Good habits help new joints last longer. Our tips:
- Keep movement joints as flexible joints, not mortar
- Keep water from gutters off the wall
- Have failed joints looked at early
- Point out the joints to other trades
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.