Kent · England
New Barn External Mastic
Movement joints in New Barn need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Joints where the bead has come unstuck
- Failed sealant between panels on a façade
- Movement joints filled with mortar instead of sealant
Leave it or put it right?
A failed movement joint lets water into the wall. Dealing with it early keeps the repair to the joint, rather than the wall around it. Homes in smaller places like New Barn can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
What you get with us
- Homes, businesses and hotels
- Any old sealant cut out fully, not covered over
- An ARBOMaster approved applicator
- Trusted Arbo and Everbuild sealants
Read our cost guide and what customers say.
External mastic in New Barn
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we’ll confirm what access is needed. Typical jobs include failed seals between different materials and movement joints filled with mortar instead of sealant, across render & cladding joints, brickwork movement joints and concrete & block.
In a smaller place like New Barn, some homes face open ground, so exposed walls and rooflines take more wind-driven rain. That is where gutter joints and wall joints tend to fail first.
You are covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Place
- New Barn (DA3, DA13)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Outside joints around New Barn
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Cobham College (about 3.1 miles east) are a reminder that the area around New Barn has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Managing a site like Longfield Academy? Then its movement joints, gutters and trims need looking after like any other building’s. Homes close to Church of Saint Mary Magdalene include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
New Barn is about 3 miles south of Northfleet, in Kent. Homes, rented property, offices and hotels in New Barn can book us for external mastic. Every job comes with our 12-month guarantee. New Barn is one of 922 places in Kent where we work for external mastic. London is on our list too, around 20 miles away.
We work across the DA3 and DA13 postcode area for external mastic and the streets around it. Streets in the area include The Maples, Kenwood Avenue and Merileys Close, and we cover them all. If you’re just outside New Barn, we cover Longfield Hill (1 mile south-east), Longfield (1 mile west), Hartley (1 mile south-west), Nash Street (1 mile east) and Meopham (2 miles south-east). Larger places within reach include Maidstone (12 miles south-east), Dartford (6 miles north-west), Sevenoaks (10 miles south-west), Gravesend (3 miles north-east), Tonbridge (14 miles south) and Northfleet (3 miles north).
Local landmarks in New Barn
Around New Barn, our work takes us to homes and buildings near Istead Rise Primary School and Rectory Meadow, among other places. The closest station to New Barn is Longfield station, roughly 1.2 miles west of the centre. Other landmarks nearby include Gravesham Museum (3.6 miles north-east) and Stone Castle (3.9 miles north-west). Green spaces nearby include Sawyers Lake.
Towns and villages near New Barn
Other services in New Barn
Landlord and commercial work in New Barn
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
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.
Surface by surface
Cladding and façade panels
Cladding and façade panels are normally separated by sealed joints. Each joint gets a sealant that suits the panel and its movement.
Render joints
Cracks along render joints let water in behind the coat. Resealing the joints early keeps water out.
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
How it works
At the end, we look at the finished work together and tell you how long to leave it. The work normally takes a few hours for a handful of joints, longer for a whole elevation, depending on how much there is to do. Parking around New Barn is usually easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Let us know about earlier repairs to the joints
- Tell us if parking is tricky
Get a quote
For a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before work begins.
Read more
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Leave the joints unpainted unless we’ve said otherwise
- Tell anyone working on the walls about the movement joints
- Clear growth from the base of walls and joints
- Have failed joints looked at early
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Act while the splits are small. At that stage it’s a simple cut out and reseal.
When to call us in New Barn
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
Signs it’s time to call us include:
- Sealant that has lost its bond to the brick or render
- Old sealant gone brittle and cracked
- Movement joints with cracked, split or missing sealant
- Movement joints filled with mortar instead of sealant
Letting a property close to Longfield station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- What the quote includes, VAT included or not
- Whether they’re fully insured
- What happens if they find a problem under the old sealant
- Whether they seal over old material or remove it
Your questions about external mastic in New Barn
Is New Barn in your area for external mastic?
Yes, New Barn is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we will send you a clear quote.
Will you come out to New Barn?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Where are you based?
Our base is in Crawley, and we work across South East England, London and Scotland.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages.
Is it messy?
We keep the work tidy. Nearby surfaces are protected, and we clear up when we are done.
Can I add another job to the visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Will there be a smell?
Sometimes, a little. It fades as the sealant cures.
How long should I leave it?
Different products cure at different speeds, so please follow the time we give you.