Kent · England
External Mastic in Sheldwich Lees
We cover Sheldwich Lees for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Weeds or debris growing in open joints
- Joints pointed up with cement by mistake
- Old sealant gone brittle and cracked
External mastic in Sheldwich Lees
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing. If you have rain getting behind render or cladding at a joint and leaking joints around cladding and façade panels, we can put it right.
Outside joints can only be sealed when they’re dry, so work in Sheldwich Lees is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
Every job comes with a 12-month guarantee.
- Place
- Sheldwich Lees (ME13)
- Wider area
- Kent
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Different surfaces, different methods
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. If that is happened, we rake it out and reseal it properly.
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. We reseal them with an exterior sealant suited to the material.
What happens on the day
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes anything from a few hours to several days, depending on the building, including the tidy-up. Somewhere as small as Sheldwich Lees, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Let us know if you’ve seen damp or leaks
- Let us know about parking restrictions
- Let us know about stairs, lifts or work at height
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Read more
When it isn’t the sealant
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Adding movement joints to masonry that has none
- Render that’s blown, hollow or coming away
- Movement that is more than a sealant joint can take
Not sure which it is? You can ring 0345 464 0079 or send us an email and we will tell you honestly before you book.
What we seal
- Copings & trims
- Brickwork movement joints
- Concrete & block
- Façade panels
- Joints between brick and frames
- Render & cladding joints
Aftercare tips
Simple care keeps the joints in good condition. We recommend:
- Deal with leaking gutters that soak the joints below
- Get split or bare joints resealed while the damage is small
- Never let anyone fill a movement joint with mortar
- Leave the joints unpainted unless we’ve said otherwise
Do not paint over the new sealant unless we’ve said the product is paintable. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years.
Nearby places to Sheldwich Lees
Other services in Sheldwich Lees
What affects the cost of external mastic
Your quote is based on your job. We take into account:
- How easy the joints are to reach
- The number and length of the joints
- Mould in or behind the old joints
- The type of sealant required
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first.
What to tell us for a quote
You don’t need to know the technical terms. Just tell us:
- A few photos by email, if you can
- Roughly how big the job is
- What’s wrong with the joints now
- Whether it has been sealed before
To get a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
External mastic in Sheldwich Lees: local notes
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Belmont House and Gardens (about 1.7 miles west) nearby, there’s older building stock in the area around Sheldwich Lees as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
If you look after a building such as Sheldwich Primary School, larger buildings have long runs of movement joint that eventually need resealing. Homes close to Church of St James include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. For landlords with property near Selling station, outside joints that have cracked can let damp into a rental, so check them between lets.
Sheldwich Lees is about 3 miles south of Faversham, in Kent. Every kind of property in Sheldwich Lees can book us for external mastic. Every job comes with our 12-month guarantee. Across Kent, we cover 922 places, and Sheldwich Lees is one of them. There’s also a page for Chelmsford, roughly 37 miles from Sheldwich Lees.
Here we cover the ME13 postcode area for external mastic. Neighbouring places we cover for external mastic include Sheldwich (1 mile north-west), Badlesmere (1 mile south), North Street (1 mile north), Throwley (1 mile west) and Throwley Forstal (2 miles south-west). We also work in nearby towns such as Ashford (9 miles south), Canterbury (8 miles east), Sittingbourne (8 miles north-west), Whitstable (8 miles north-east), Faversham (3 miles north) and Herne Bay (13 miles north-east).
Near you in Sheldwich Lees
For rail, the closest station is Selling station, roughly 2.4 miles east of the centre. Other landmarks nearby include Tower keep castle at Chilham (3.7 miles south-east).
FAQs for Sheldwich Lees
Can you do external mastic in Sheldwich Lees?
Yes. We work across London and the South East, and Sheldwich Lees is part of that. You can call 0345 464 0079 or email us and let us know what needs doing, and we’ll send you a clear quote.
I let a flat near Selling station. Can you help?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
Where is Mr Mastic based?
We are based in Crawley, and we cover South East England, London and all of Scotland.
Do you work for hotels and businesses?
Yes. We can plan bigger jobs in stages to suit the site.
Is there any odour?
Some sealants have a smell while they cure, which fades as it sets. Opening a window helps.
Will the new joint stand out?
We choose a sealant colour to suit the brick, stone or render so the joint blends in. There’s a wide choice of exterior colours.
How long does the job take?
That depends on the amount of work, but most jobs take a few hours for a handful of joints, longer for a whole elevation. We’ll tell you when we quote.
Do I have to be there?
It depends on the job. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
Leave it or put it right?
Water gets in through a failed movement joint. Dealing with it early keeps the repair to the joint, rather than the wall around it. Around Sheldwich Lees, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before we start.
Why Sheldwich Lees clients choose us
- Every job guaranteed for a year
- Rated 4.9 stars on Google
- White, clear, grey or coloured to suit, where the product allows
- We never seal over old sealant