Kent · England
External & façade joints in Headcorn, Kent
External mastic for Headcorn, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Movement joints filled with mortar instead of sealant
- Cracked joints where brick meets render or frames
- Old sealant gone brittle and cracked
What happens if it’s left?
A failed movement joint lets water into the wall and can run behind render or cladding. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. In a smaller place like Headcorn, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why choose Mr Mastic in Headcorn
- Anti-fungal silicone where joints get wet
- Full insurance on every job
- Arbo and Everbuild products
- A 12-month guarantee on all work
External mastic in Headcorn, done properly
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. We’re often asked to deal with weathered mastic that no longer stretches and failed sealant between panels on a façade, on copings & trims, concrete & block and façade panels.
Houses in smaller places like Headcorn can stand more in the open than those in a built-up town, so exposed walls and rooflines take more wind-driven rain. Joints on those sides are generally the first to go.
All our work is covered by our one-year guarantee, wherever you are in Kent.
- Place
- Headcorn (TN27)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Other services in Headcorn
Walls and rooflines in Headcorn
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Headcorn station? Then outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as St Peter's and St Paul's Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Headcorn is about 8 miles south-east of Maidstone, in Kent. Our applicators cover external mastic for homes and businesses in Headcorn. Headcorn is one of 922 places in Kent we cover. Crawley is on our list too, around 36 miles away.
Here we cover the TN27 postcode area for external mastic. You’ll find streets such as Station Road, High Street and Knight's Way, all of which we cover. We also cover the places around Headcorn: Hearnden Green (1 mile north-west), Southernden (2 miles north-east), Swift's Green (2 miles east), Lashenden (2 miles south) and Smarden Bell (2 miles south-east). Within a short drive, we also cover Maidstone (8 miles north-west), Ashford (11 miles east), Sittingbourne (13 miles north), Tonbridge (15 miles west), Faversham (15 miles north-east) and Kings Hill (12 miles north-west).
What’s near Headcorn
Around Headcorn, our work takes us to homes and buildings near The Kings Arms Inn And Shop Adjoining To Right and the streets around them. Headcorn has its own railway station: Headcorn station. Well-known places in the area include Sutton Valence Castle (3.2 miles north-west) and Benenden Hospital (5.8 miles south).
DIY versus a professional finish
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.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Loose or hollow render, which needs re-rendering
- Structural movement, which needs a surveyor or engineer
- Cracked brickwork or render that needs a builder or plasterer
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly.
Joints and surfaces we work on
- Façade panels
- Joints between brick and frames
- Copings & trims
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
When to call us in Headcorn
Sunlight, wet weather and frost wear exterior sealant down. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
Signs it’s time to call us include:
- Panel joints letting water in
- Sealant that has lost its bond to the brick or render
- Rigid filler in a joint that should flex
- Moss and dirt in joints with no sealant left
If you look after a building such as Headcorn Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Comparing quotes
- How long the guarantee is
- Which sealant they’ll use, and why
- How much experience the applicator has
- Whether VAT is included
What affects the quote in Headcorn
The price is agreed before any work begins. It’s based on:
- The size of the job
- How many rooms, windows or areas are involved
- When we can work, for business premises
- Whether the work is at height
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we will go through it with you.
Helping us quote
To make quoting easier, please include:
- Roughly how big the job is
- Any access issues, like height or stairs
- The type of property
- If someone has resealed it before
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
How it works
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes anything from a few hours to several days, depending on the building. A visit to Headcorn is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- Clear items away from the joints we’re working on
- Tell us about any previous sealing or DIY attempts
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
Every job is quoted individually. Just phone 0345 464 0079 or drop us an email with the details, and pictures are welcome.
Advice
Surface by surface
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.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. Their movement joints are sealed over backing rod with a flexible sealant.
Headcorn questions
Do you cover smaller places like Headcorn?
Yes. Headcorn is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I let a flat near Headcorn station. Can you help?
Yes, we work for landlords and letting agents. You can phone 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Can a movement joint be filled with mortar?
No, not where the gap is a movement joint. Pointing it stops it working and can lead to cracking. A flexible sealant is the right fill.
How long does external mastic take?
A typical job takes anything from a few hours to several days, depending on the building, including preparation and clearing up. We’ll confirm how long when we quote.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before resealing.
What do you need from me for a quote?
A short description and the location, plus photos if you have them. If we need more, we will ask.
Is the work guaranteed?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we’ll put it right.
How long does external mastic last?
That depends on the wall, the weather and the movement. Signs to watch for are cracking, hardening and gaps at the edges, and reseal at that point.