Kent · England
External Mastic in Northfleet Green
External mastic across Northfleet Green and nearby, with old sealant always removed completely and a 12-month guarantee.
- Leaking joints around cladding and façade panels
- Cracked joints where brick meets render or frames
- Rigid filler in a joint that should flex
How we handle external mastic in Northfleet Green
A movement joint is a deliberate break that lets a wall expand and contract. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. We work on brickwork movement joints, concrete & block and joints between brick and frames, and the jobs we see most are damp patches traced to an open external joint and movement joints with cracked, split or missing sealant.
External sealant needs dry, clean surfaces, so work around Northfleet Green is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
All our work is covered by our 12-month guarantee, wherever you are in Kent.
- Where
- Northfleet Green (DA13, DA11)
- Wider area
- Kent
- Cover
- A year, on every job
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Northfleet Green
Can you help a landlord with a rental near Ebbsfleet International station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Do you cover smaller places like Northfleet Green?
Yes. Northfleet Green is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Treat it as a maintenance item and look at it yearly.
Can you match the colour of my brickwork?
We aim for a joint that suits the wall rather than one that jumps out. Colour is agreed with you before we begin.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
When is the sealant fully cured?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
Is there any odour?
Possibly a little. It fades as the sealant cures.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done and we’ll quote it together.
Places near Northfleet Green
What else we do in Northfleet Green
Surface by surface
Cladding and façade panels
Panels heat up and cool down quickly, so the joints work hard every day. We choose the product to suit.
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. We seal the joint with a flexible exterior sealant.
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
What we do, step by step
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Northfleet Green, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- 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.
How to prepare
- Tell us about any water getting in
- Plan for the work area to be out of bounds to pets and children
- On commercial sites, let us know about site rules
Getting a quote
Getting a quote is simple: let us know the job and the location and its rough size. A few photos by email make the job easier to understand.
Read more
External mastic in Northfleet Green: local notes
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Cobham College (about 3.2 miles south-east) are a reminder that the area around Northfleet Green has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
For site and facilities teams at buildings such as Painters Ash Primary School, its movement joints, gutters and trims need looking after like any other building’s. For landlords with property near Ebbsfleet International station, split movement joints are easy to miss on a rental until damp shows inside. Homes close to Church of St Nicholas include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Northfleet Green is about 1 mile south of Northfleet, in Kent. Wherever you are in the DA13 postcode area, our applicators can take on external mastic. 922 places in Kent are on our list, large and small. London is on our list too, about 19 miles from Northfleet Green.
Work in DA13 and DA11 works the same way as everywhere else we cover. External mastic is available to properties on Downs Road and New Barn Road and the roads around them. Other places close to Northfleet Green include Southfleet (1 mile west), Painters Ash (1 mile north), Istead Rise (1 mile south-east), Hook Green (1 mile west) and Springhead (1 mile north). Larger places within reach include Maidstone (13 miles south-east), Dartford (5 miles west), Sevenoaks (11 miles south-west), Tonbridge (15 miles south), Swanley (7 miles west) and Kings Hill (10 miles south).
Local landmarks in Northfleet Green
Typical jobs here are in homes near Black Lion pub, Northfleet School for Girls and Saint George's Church of England School, among other places. The closest station to Northfleet Green is Ebbsfleet International station, roughly 2 miles north of the centre. Well-known places in the area include Gravesham Museum (2.3 miles north-east) and Bluewater (3.3 miles north-west). The countryside around Northfleet Green includes Sawyers Lake.
What affects the cost of external mastic
There’s no set price list, because no two jobs are the same. The quote depends on:
- The old material and how stubborn it is
- Which sealant suits the joint
- Working hours on commercial sites
- The size of the job
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Helping us quote
What to tell us when you ask for a quote:
- Photos by email, if that is easy
- The problem you’ve noticed
- Where the property is
- Roughly how big the job is
There’s no standard price list. Instead, we send you a clear quote for your job. To get started, phone 0345 464 0079 or send us an email.
Aftercare tips
To keep the joints looking good and working properly:
- Wash walls gently around the sealant
- Act on the first splits you see
- Don’t let climbing plants root in the sealant
- Make sure movement joints are not pointed over
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years.
Why it’s worth doing now in Northfleet Green
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. In a small place like Northfleet Green, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first and agree the price before starting.
What you get with us
- Every job guaranteed for a year
- 20+ years of sealant experience
- You choose the colour before work begins
- We leave the area clean and tidy
Read our cost guide and our reviews.