Kent · England
External & façade joints in Keycol, Kent
We cover Keycol for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Hard, crazed mastic that has stopped moving
- Panel joints letting water in
- Joints pointed up with cement by mistake
FAQs for Keycol
Does the coastal weather in Keycol affect outside sealant?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Can you help a landlord with a rental near Newington station?
Yes, we work for letting agents and landlords. Just call 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.
Is it OK to seal over old sealant?
No. We remove every bit of old sealant first, so the new sealant bonds properly.
What’s an expansion joint in brickwork?
Walls move with heat, cold and moisture, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
How long does the job take?
A typical job takes a few hours for a handful of joints, longer for a whole elevation, including preparation and clearing up. We’ll confirm how long when we quote.
Will you leave a mess?
No. The area is protected while we work and cleaned up afterwards.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.
About our external mastic in Keycol
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. We’re often asked to deal with movement joints with cracked, split or missing sealant and rain getting behind render or cladding at a joint, on brickwork movement joints, concrete & block and façade panels.
Outside joints can only be sealed when they’re dry, so work in Keycol is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
A one-year guarantee comes as standard, so you are covered after we’ve gone.
- Place
- Keycol (ME9)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Other services in Keycol
Walls and rooflines in Keycol
Keycol is within about 3 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Schools such as Borden Church of England Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. If you let a flat or house near Newington station, outside joints that have cracked can let damp into a rental, so check them between lets.
Keycol is about 2 miles west of Sittingbourne, in Kent. We carry out external mastic for homeowners, landlords and businesses in Keycol and the surrounding area, as part of our work across Kent. Our area takes in 922 places across Kent. For nearby work, see our Chelmsford page, about 28 miles away.
Postcode districts we cover here for external mastic: ME9. If you need external mastic at a property on Rooks View, Hill Farm View and Rook Lane or a nearby road, our applicators can take on the job. We also cover the places around Keycol: Bobbing (1 mile east), Chestnut Street (1 mile south), Newington (1 mile west), Danaway (1 mile south-west) and Oad Street (2 miles south). Further out, we also cover Maidstone (9 miles south-west), Gravesend (15 miles north-west), Whitstable (15 miles east), Faversham (9 miles east), Minster (7 miles north-east) and Kings Hill (13 miles south-west).
What’s near Keycol
Locally, jobs take us to homes and businesses close to Westlands School and George Inn and the streets around them. The nearest railway station is Newington station, roughly 1.1 miles west. Well-known places in the area include Court Hall Museum (1.8 miles east) and Bayford Court (2.3 miles east).
Quotes for external mastic in Keycol
We quote each job individually. This is what makes a difference:
- How much old sealant there is and how hard it is to remove
- Any mould that needs treating
- Working hours on commercial sites
- The size of the job
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first and send you a clear quote before any work starts.
Helping us quote
When you contact us, these details help:
- The rough size of the job
- The type of property
- The problem you’ve noticed
- Where the property is
Asking for a quote is easy: let us know the job and the location and its rough size. A few photos by email make the job easier to understand.
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Do not let climbing plants root in the sealant
- Look over the joints every year, ideally after winter
- Keep movement joints as flexible joints, not mortar
- Act on the first splits you see
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
Honest limits
We’d rather tell you now than do work that won’t last, so here’s what sealant cannot put right:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Render that is blown, hollow or coming away
- Cracking across the wall rather than at a joint
If you’re not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Where we work in Keycol
- Façade panels
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Concrete & block
- Joints between brick and frames
When to call us in Keycol
If plants are growing out of a joint, the sealant has usually failed or was never there. Dirt and roots then trap moisture in the joint.
Signs it’s time to call us include:
- Brick movement joints where the sealant has split
- Gaps where render, brick and frames meet
- Joints where the bead has come unstuck
- Weathered mastic that no longer stretches
For an older house near a landmark such as Church of St Bartholomew, an extension built onto an older house moves differently, and the joint between them takes the strain.
Before you book anyone
- Whether the sealant suits the joint
- What happens if they find a problem under the old sealant
- Whether they’re fully insured
- How much experience the applicator has
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Should I try it myself first?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
How the visit works
Most of a good job is in the preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. In total, it usually takes a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Keycol, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Mention if the joints have been sealed before
- Plan for the work area to be out of bounds to pets and children
- For business premises, tell us about site rules or sign-in
Ask for a quote
To get a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. We will give you a clear quote before any work starts.