Kent · England
External & façade joints in Coursehorn, Kent
Professional external mastic in and around Coursehorn, with old sealant always removed completely.
- Movement joints filled with mortar instead of sealant
- Moss and dirt in joints with no sealant left
- Gaps where render, brick and frames meet
External mastic in Coursehorn, done properly
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it, and we don’t skip that step. We work on concrete & block, façade panels and joints between brick and frames, and common reasons people get in touch are sealant that has lost its bond to the brick or render and movement joints filled with mortar instead of sealant.
In a village or hamlet like Coursehorn, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Place
- Coursehorn (TN17)
- Region
- Kent
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Landlord and commercial work in Coursehorn
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will give you a quote.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
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. The work normally takes anything from a few hours to several days, depending on the building. In a small place like Coursehorn, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- 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.
Before we arrive
- Mention any tricky access
- Keep pets and children clear of the area while we work
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
If you are in Coursehorn and need external mastic, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before we start.
Advice
Walls and rooflines in Coursehorn
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.
Homes close to Church of St Dunstan include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Coursehorn is about 12 miles south of Maidstone, in Kent. Across the TN17 area, we cover external mastic for homes and businesses. Across Kent, we cover 922 places, and Coursehorn is one of them. Our Crawley page covers work nearby.
We work across the TN17 postcode area for external mastic. If you are just outside Coursehorn, we cover Baker's Cross (1 mile west), Cranbrook (1 mile west), Swattenden (1 mile south-west), Hartley (2 miles south-west) and Benenden (2 miles south-east). Further out, we also cover Maidstone (12 miles north), Ashford (14 miles east), Royal Tunbridge Wells (13 miles west), Tonbridge (14 miles north-west), Kings Hill (14 miles north-west) and Foley Park (13 miles north).
Near you in Coursehorn
Typical jobs here are in homes near White Horse pub, Cranbrook Church of England Primary School and Crane Valley, among other places. Other landmarks nearby include Sissinghurst Castle (1.7 miles north-east) and Sissinghurst Castle (1.7 miles north-east).
Why deal with it now?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. Where a wall is exposed, as many are in small places like Coursehorn, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we’ll explain what it covers.
Why choose Mr Mastic in Coursehorn
- Sealant colour chosen to suit
- Any old sealant cut out fully, not covered over
- 12-month guarantee on every job
- Neat joints and a tidy finish
Take a look at how sealant jobs are priced or what customers say.
Coursehorn questions
What guarantee comes with external mastic in Coursehorn?
Every job comes with our 12-month guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Will you come out to Coursehorn?
Yes. Coursehorn is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
How much does external mastic cost in Coursehorn?
It depends on the job, so we quote each one individually. For a quick quote, phone 0345 464 0079 or drop us an email and tell us what needs doing and where.
How long does external mastic last?
It depends on the exposure, the movement and the product. Sealant is a maintenance item, so check the joints once a year and renew it when it starts to fail.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so the joint between them must be flexible. We choose one that suits both surfaces.
Does someone need to be in?
That depends on where the joints are. Inside work needs someone to give us access, and for outside work we’ll agree access with you when we book.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Can tenants book the work?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
When something else is needed
New sealant can’t fix everything, and we’ll tell you before work begins. Sealant won’t put right:
- Structural movement, which needs a surveyor or engineer
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracking across the wall rather than at a joint
If in doubt, ring 0345 464 0079 or email us and we will say what we think before you book.
Joints and surfaces we work on
- Render & cladding joints
- Façade panels
- Joints between brick and frames
- Copings & trims
- Concrete & block
- Brickwork movement joints
Common problems we fix in Coursehorn
Using the wrong sealant is another common reason. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, and it tears off the sides.
These are the problems we are asked about most:
- Rigid filler in a joint that should flex
- Leaking joints around cladding and façade panels
- Sealant pulling away from one side of the joint
- Hard, crazed mastic that has stopped moving
Managing a site like Cranbrook School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Questions to ask before booking
- Whether the sealant suits the joint
- Are they insured?
- How hidden problems are handled
- Whether all the old sealant comes out first
Also near Coursehorn
What else we do in Coursehorn
What affects the cost of external mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether old sealant or filler has to be cut out
- The product the joint needs
- The number and length of the joints
- Whether the work is at height
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re unsure, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- Any previous sealing or DIY work
- A few photos by email, if you can
- How many joints, rooms or windows are involved
- If it’s domestic, commercial or a hotel
Want a quote for external mastic? Please call 0345 464 0079 or drop us an email with a few details. We’ll explain what we’d do and give you a clear price before any work starts.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Act on the first splits you see
- Keep movement joints as flexible joints, not mortar
- Clear growth from the base of walls and joints
- Deal with leaking gutters that soak the joints below
Do not paint over the new sealant unless we’ve said the product is paintable. Paint can crack on a flexible joint.
A joint that has stopped moving pushes the movement elsewhere, usually as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.