Kent · England
External Mastic in Kemsley
Our applicators work in Kemsley on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Old sealant gone brittle and cracked
- Weeds or debris growing in open joints
- Rigid filler in a joint that should flex
How we handle external mastic in Kemsley
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We strip the joint back and start again. If you have gaps where render, brick and frames meet and leaking joints around cladding and façade panels, we can help.
Outbuildings, garages and conservatories around homes in places like Kemsley add more joints to look after. Leaks usually start at a gutter end, a garage door frame or where an extension meets the house.
Big or small, you get the same 12-month guarantee.
- Location
- Kemsley (ME10, ME9)
- Region
- Kent
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
When to call us in Kemsley
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
If you can see any of these, it’s time to have the joints looked at:
- Movement joints with cracked, split or missing sealant
- Moss and dirt in joints with no sealant left
- Movement joints filled with mortar instead of sealant
- Leaking joints around cladding and façade panels
Managing a site like Kemsley Primary Academy? Then its movement joints, gutters and trims need looking after like any other building’s.
What to look for in a quote
- Are they insured?
- What happens if the job turns out different
- Which sealant they’ll use, and why
- How the joint is cleaned and prepared
What the job involves on each surface
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. That movement goes into the joint, so its sealant has to stay flexible.
Render joints
Cracks along render joints let water in behind the coat. A sound joint keeps the render dry behind.
Common questions in Kemsley
Is Kemsley within the area you cover?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you work for landlords with property near Kemsley station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Is there a guarantee?
Yes. All our work carries a one-year guarantee.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. We can talk about working times when we quote.
Can you match the colour of my brickwork?
The aim is a neat, even joint in a colour that suits the wall. We will talk through colour options before we start, matched as closely as the range allows.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint.
Is there any odour?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Kemsley, along with the rest of our area.
What affects the cost of external mastic
Every job gets its own quote. These are the things that affect it:
- The number of rooms or windows
- Mould in or behind the old joints
- The product the joint needs
- The old material and how stubborn it is
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before work begins, so you know where you stand.
Asking for a quote
To help us quote quickly, please include:
- Whether it has been sealed before
- Where the job is, and your postcode
- How many joints, rooms or windows are involved
- Access, such as stairs, a lift or height
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work and give you a clear price.
What happens on the day
At the end, we look at the finished work together. The visit itself usually takes anything from a few hours to several days, depending on the building, depending on the size of the job. Parking around Kemsley is usually easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Keep children and pets away from the work area
- Mention any leaks or damp you’ve noticed
- Clear the area around the work
Ask for a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you’re ready, ring 0345 464 0079 or email us.
Read more
Should I try it myself first?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
Landlords, agents and businesses in Kemsley
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
We work for landlords and letting agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
What sealant work can’t fix
New sealant cannot fix everything, and we’d rather say so up front. It won’t solve:
- Damp that isn’t coming from the joint
- Cutting new joints into brickwork, which is building work rather than sealant work
- Loose or hollow render, which needs re-rendering
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly 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
External mastic in Kemsley: local notes
Kemsley is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. 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.
For landlords with property near Kemsley station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. For an older house near a landmark such as Parish Church of the Holy Trinity, an extension built onto an older house moves differently, and the joint between them takes the strain.
Kemsley is about 1 mile north of Sittingbourne, in Kent. From the centre of Kemsley to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Kemsley is one of 922 towns and villages in Kent we cover for external mastic. You can also see our page for Chelmsford, roughly 28 miles from Kemsley.
Postcode districts we cover here for external mastic: ME10 and ME9. If you need external mastic at a property on Court Road, Menin Road and Hurst Lane or a nearby road, our applicators can take on the job. Other places close to Kemsley include Howt Green (1 mile west), Milton Regis (1 mile south-east), Sittingbourne (1 mile south), Iwade (1 mile north-west) and Murston (1 mile south). Further out, we also cover Maidstone (11 miles south-west), Whitstable (13 miles east), Faversham (7 miles south-east), Minster (5 miles north-east), Davington (7 miles south-east) and Foley Park (10 miles south-west).
What’s near Kemsley
In Kemsley, that means homes and buildings near Milton Creek Country Park, The Three Hats Inn and Borden Grammar School, among other places. Kemsley has its own railway station: Kemsley station. Other landmarks nearby include Castle Rough (0.6 miles east) and Court Hall Museum (0.8 miles south-west).