Kent · England
External & façade joints in Heart's Delight, Kent
Sealing brickwork movement joints, render, cladding and façade joints in Heart's Delight, with a one-year guarantee on every job. Ask us for a quote.
- Leaking joints around cladding and façade panels
- Movement joints with cracked, split or missing sealant
- Water getting into walls through failed joints
How we handle external mastic in Heart's Delight
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We take the old material out and do it properly. If you are dealing with panel joints letting water in and weeds or debris growing in open joints, we can put it right, whatever the surface.
Outside joints can only be sealed when they’re dry, so work in Heart's Delight is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
We stand behind the work with a 12-month guarantee, so you are covered after we have gone.
- Where
- Heart's Delight (ME10, ME9)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What happens if it’s left?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. Older cottages and farmhouses around Heart's Delight can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Doing several joints on one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
Why Heart's Delight customers choose us
- A 12-month guarantee on all work
- Approved under the ARBOMaster scheme
- Arbo and Everbuild products
- White, clear, grey or another colour, product permitting
When something else is needed
We won’t take on work that will not last, so here’s what sealant cannot put right:
- Cracking across the wall rather than at a joint
- Structural movement, which needs a surveyor or engineer
- Loose or hollow render, which needs re-rendering
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Façade panels
- Copings & trims
- Brickwork movement joints
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 from start to finish. Somewhere as small as Heart's Delight, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Mention any leaks or damp you’ve noticed
- On commercial sites, let us know about site rules
Get a quote
We quote each job on its own. Simply call 0345 464 0079 or email us and describe the job.
Read more
Heart's Delight buildings and the weather
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as Minterne Community Junior School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. In the older streets around Church of St Peter and St Paul, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Heart's Delight is about 1 mile south-west of Sittingbourne, in Kent. Across the ME10 area, our applicators can take on external mastic. We cover 922 towns and villages across Kent. Chelmsford is on our list too, around 30 miles away.
All of ME10 and ME9 is covered for external mastic. If you need external mastic at a property on The Street, Borden Lane and Coppins Lane or a nearby road, we can help. If you are just outside Heart's Delight, we cover Borden (1 mile north-west), Tunstall (1 mile south-east), Sittingbourne (1 mile north-east), Highsted (2 miles south-east) and Rodmersham Green (2 miles south-east). We also work in nearby towns such as Maidstone (9 miles south-west), Ashford (15 miles south-east), Whitstable (14 miles east), Faversham (8 miles east), Minster (7 miles north-east) and Kings Hill (14 miles west).
Near you in Heart's Delight
In Heart's Delight, that means homes and buildings near Westlands School and Cromers Wood. The closest station to Heart's Delight is Sittingbourne station, about 1.4 miles north-east. Well-known places in the area include Bayford Court (1.7 miles north-east) and Sittingbourne Heritage Museum (1.5 miles north-east).
Also near Heart's Delight
More services for Heart's Delight
Looking after it afterwards
So the new joints stay in good condition:
- Ask before painting over external sealant
- Keep high-pressure jets off the joints
- Point out the joints to other trades
- Keep soil, plants and ivy away from the joints
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges and let water in behind.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick.
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will give you a quote.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
Heart's Delight: your questions answered
Can you do external mastic in Heart's Delight?
Yes. We work across London and the South East, and Heart's Delight is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Can you help a landlord with a rental near Sittingbourne station?
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 any work starts.
What is a movement joint?
Most straight vertical gaps in brickwork are movement joints. It gives the wall room to move.
Do you guarantee your work?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we’ll put it right.
Which products do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we are using and why.
Where are you based?
We’re a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
What does external mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote.
Are you fully insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Common problems we fix in Heart's Delight
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The new sealant then lets go long before it should.
Keep an eye out for any of the following:
- Hard, crazed mastic that has stopped moving
- Water getting into walls through failed joints
- Gaps where render, brick and frames meet
- Movement joints with cracked, split or missing sealant
If you let a flat or house near Sittingbourne station, outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- What the cure time is
- How the joint is cleaned and prepared
- The length of the guarantee
- Whether they seal over old material or remove it
Surface by surface
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. We prime where the sealant needs it before the bead.
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.