Kent · England
External Mastic in Sittingbourne
Specialist external mastic for Sittingbourne: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Leaking joints around cladding and façade panels
- Weathered mastic that no longer stretches
- Rigid filler in a joint that should flex
How we handle external mastic in Sittingbourne
On houses, flats and commercial buildings across Sittingbourne, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. We work on brickwork movement joints, copings & trims and render & cladding joints, and common reasons people get in touch are gaps where render, brick and frames meet and sealant that has lost its bond to the brick or render.
Extensions are a common sight on houses around Sittingbourne, and the joint where new wall meets old is a classic place for water to get in. Getting the joint depth right matters as much as the sealant itself.
Our work is backed for twelve months, in Sittingbourne and everywhere else we cover.
- Where
- Sittingbourne (ME10, ME9)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Price
- A clear price before we start
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the quote in Sittingbourne
Every job gets its own quote. This is what makes a difference:
- Whether there’s mould to deal with
- How easy the joints are to reach
- Whether old sealant or filler has to be cut out
- How much there is to do
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- If someone has resealed it before
- Where the property is
- Access, such as stairs, a lift or height
- Whether it’s a home or a business
Every job is quoted individually. Simply call 0345 464 0079 or send us an email and describe the job.
Your questions about external mastic in Sittingbourne
Does living near the coast affect external mastic in Sittingbourne?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do you cover Sittingbourne for external mastic?
Yes, Sittingbourne is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing, and we’ll send you a clear quote.
Are you fully insured?
Yes. We’re fully insured for domestic and commercial work.
Do you work for letting agents?
Yes. As well as householders, we work for landlords, agents, businesses and hotels.
What should I tell you?
Only a few details: where it is, what you’ve noticed and how we reach it. Then call 0345 464 0079 or drop us an email.
How do I get a quote for external mastic in Sittingbourne?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
What is a movement joint?
Walls move with heat, cold and moisture, so long walls have planned gaps to take that movement. The gap is sealed with a flexible sealant over backing rod.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We’ll tell you how long to leave the joint before we leave.
Honest limits
Some problems need a builder, plumber or other trade rather than us:
- Loose or hollow render, which needs re-rendering
- Cracks in the bricks or render themselves, away from the joints
- Structural movement, which needs a surveyor or engineer
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Render & cladding joints
- Copings & trims
Also near Sittingbourne
Other services in Sittingbourne
What external mastic looks like in Sittingbourne
Sittingbourne is close to 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. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Sittingbourne station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. If you live in an older home near Church of the Holy Trinity, an extension built onto an older house moves differently, and the joint between them takes the strain.
Sittingbourne is about 37 miles east of London, in Kent. Homes, rented property, offices and hotels in Sittingbourne can book us for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. Our area takes in 922 places across Kent, from the larger towns to small villages. There’s also a page for Chelmsford, roughly 29 miles from Sittingbourne.
Every address in ME10 and ME9 is within our area for external mastic, from the main roads to the quietest streets. Local streets include High Street, Roman Square and Moonstone Square, and we cover them all. You will find Sittingbourne on the A2 and A249, which makes it straightforward to reach. Nearby, we also carry out external mastic in Murston (1 mile east), Milton Regis (1 mile north-east), Kemsley (1 mile north), Howt Green (1 mile north-west) and Heart's Delight (1 mile south-west). We also work in nearby towns such as Maidstone (10 miles south-west), Ashford (15 miles south), Whitstable (13 miles east), Faversham (7 miles east), Minster (6 miles north-east) and Kings Hill (15 miles west). Sittingbourne is among the bigger towns we cover in Kent.
Near you in Sittingbourne
In Sittingbourne, that means homes and buildings near Milton Court Primary Academy, The Golden Hope pub and Milton Creek Country Park, among other places. There’s a railway station in Sittingbourne itself: Sittingbourne station. Nearby you will also find Bayford Court (under half a mile east) and Court Hall Museum (less than half a mile north).
What we’re called out for in Sittingbourne
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
If you can see any of these, it’s time to have the joints looked at:
- Moss and dirt in joints with no sealant left
- Leaking joints around cladding and façade panels
- Failed seals between different materials
- Brick movement joints where the sealant has split
Managing a site like Borden Grammar School? Then its movement joints, gutters and trims need looking after like any other building’s.
Questions to ask before booking
- How hidden problems are handled
- Who turns up on the day
- What guarantee comes with the work
- What preparation is included
What we do, step by step
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. Most jobs take a few hours to a few days, depending on the length of joint and the access. In Sittingbourne, parking is rarely complicated, though it helps to know about driveways or restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs 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.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any water getting in
- Clear the area around the work
Ask for a quote
For external mastic in Sittingbourne, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.
Advice
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Never let anyone fill a movement joint with mortar
- Wash walls gently around the sealant
- Point out the joints to other trades
- Keep water from gutters off the wall
Only paint over the joint if we have confirmed the sealant can take paint. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Act while the splits are small. At that stage it’s a simple cut out and reseal.
What the job involves on each surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod in a colour to suit the brick.
Render joints
Render has movement joints and stop beads that need sealing. We reseal them with a flexible exterior sealant that suits the render colour.