Kent · England
Northbourne External Mastic
Movement joints in Northbourne need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Hard, crazed mastic that has stopped moving
- Sealant pulling away from one side of the joint
- Weeds or debris growing in open joints
External mastic in Northbourne
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, so it bonds to the two sides only and can stretch. Common call-outs are for old sealant gone brittle and cracked and gaps where render, brick and frames meet, on concrete & block, render & cladding joints and joints between brick and frames.
Older homes in small places like Northbourne may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Place
- Northbourne (CT14)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Walls and rooflines in Northbourne
With historic houses such as Walmer Castle (about 3 miles south-east) nearby, there’s older building stock in the area around Northbourne as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. 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 Northbourne Church of England Primary School are buildings too, and 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 Augustine, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Northbourne is about 2 miles west of Deal, in Kent. Wherever you are in the CT14 postcode area, we can carry out external mastic at your property. Our Kent coverage runs to 922 places, Northbourne among them. For nearby work, see our Chelmsford page.
Here we cover the CT14 postcode area for external mastic. That includes homes and businesses on Deal Road, Coulson Grove and Mill Lane. Other places close to Northbourne include Marley (1 mile north), Great Mongeham (1 mile south-east), Finglesham (1 mile north), Sholden Meadows (1 mile east) and Sholden (1 mile east). We also work in nearby towns such as Canterbury (12 miles west), Margate (11 miles north), Dover (6 miles south), Folkestone (12 miles south-west), Ramsgate (9 miles north) and Broadstairs (11 miles north).
What’s near Northbourne
Typical jobs here are in homes near Castle Community College, Hare & Hounds pub and Betteshanger Park and the streets around them. Northbourne’s nearest station is Walmer station, about 2.2 miles south-east. Well-known places in the area include Deal Castle (2.8 miles east) and Kent Museum of the Moving Image (2.7 miles east). For a walk, there’s Monk's Wall nature reserve.
What affects the quote in Northbourne
The quote reflects the job in front of us. We look at:
- How much old sealant there is and how hard it is to remove
- When we can work, for business premises
- Whether the work is at height
- The number of rooms or windows
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Whether it’s a home or a business
- Roughly how big the job is
- How we’d reach the joints
- A few pictures by email, if you can
There’s no standard price list. Instead, we send you a clear quote for your job. To get started, ring 0345 464 0079 or send us an email.
Northbourne: your questions answered
Will you come out to Northbourne?
Yes. Northbourne is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Northbourne for external mastic?
Yes, Northbourne is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Can I do it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
What information do you need?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
Do you work for landlords and businesses?
Yes, we do. Domestic, commercial and hotel work are all part of what we do, and we are fully insured.
Can new sealant go over the old?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
How do I get a quote for external mastic in Northbourne?
Size, access and the old material all affect the cost. Call for a quick quote and we’ll talk you through it.
For landlords and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Common problems we fix in Northbourne
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Keep an eye out for any of the following:
- Leaking joints around cladding and façade panels
- Weathered mastic that no longer stretches
- Joints with sealant missing in places
- Water getting into walls through failed joints
If you let a flat or house near Walmer station, outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- Whether all the old sealant comes out first
- How long to leave it before use
- Which colour the sealant will be
- What preparation is included
What happens if it’s left?
A failed movement joint lets water into the wall and can run behind render or cladding. Dealing with it early keeps the repair to the joint, instead of the wall and finishes around it. In a small place like Northbourne, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
What you get with us
- Homes, businesses and hotels
- A 12-month guarantee on all work
- Colour agreed with you before any work starts
- Anti-fungal silicone where joints get wet
Take a look at what affects the cost or our reviews.
How the visit works
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the work takes anything from a few hours to several days, depending on the building in most cases. Somewhere like Northbourne needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Mention any tricky access
- Mention any sign-in or site rules at work premises
How to get a quote
Getting a quote is simple: let us know what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we will come back to you with a quote.
Related advice
Towns and villages near Northbourne
Other services in Northbourne
What we cannot put right
Before booking, it’s worth knowing the limits:
- Cracks in the bricks or render themselves, away from the joints
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cutting new joints into brickwork, which is building work rather than sealant work
If you’re not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer before you book.
What we seal
- Concrete & block
- Brickwork movement joints
- Façade panels
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
Aftercare tips
After the cure time, these simple habits help:
- Look over the joints every year, ideally after winter
- Have failed joints looked at early
- Do not let climbing plants root in the sealant
- Make sure movement joints aren’t pointed over
Don’t paint over the new sealant unless we have said the product is paintable. Many exterior sealants aren’t designed to be painted.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.