Kent · England
External Mastic in New Ash Green
Sealing brickwork movement joints, render, cladding and façade joints for New Ash Green, backed by a one-year guarantee. Call for a quick quote.
- Leaking joints around cladding and façade panels
- Weathered mastic that no longer stretches
- Weeds or debris growing in open joints
What external mastic looks like in New Ash Green
Historic houses like Cobham College (about 4.3 miles east) are a reminder that the area around New Ash Green has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Longfield station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. For site and facilities teams at buildings such as New Ash Green Primary School, its movement joints, gutters and trims need looking after like any other building’s. If you live in an older home near Parish Church of Saint Peter and Saint Paul, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
New Ash Green is about 5 miles south of Northfleet, in Kent. For external mastic in and around New Ash Green, it’s easy to get a quote: please call 0345 464 0079 or email us. We cover Kent from our Crawley base, New Ash Green included. Our Kent coverage runs to 922 places, New Ash Green among them. Our London page covers work nearby, about 20 miles away.
Here we cover the DA3 and TN15 postcode area for external mastic. That includes homes and businesses on Church Road, Upper Street North and Upper Street South and the roads around them. If you’re just outside New Ash Green, we cover Ridley (1 mile south-east), Hartley (1 mile north), New Street (2 miles south-east), Hodsoll Street (2 miles south-east) and Longfield Hill (2 miles north-east). Further out, we also cover Maidstone (12 miles south-east), Dartford (6 miles north-west), Sevenoaks (8 miles south-west), Gravesend (5 miles north-east), Tonbridge (12 miles south) and Northfleet (5 miles north).
Around New Ash Green
Locally, jobs take us to homes and businesses close to The White Swan Public House, Longfield Academy and Rectory Meadow. The closest station to New Ash Green is Longfield station, about 2.1 miles north of the centre. Other landmarks nearby include Eynsford Castle (4 miles west) and Darent Valley Hospital (5.2 miles north-west).
External mastic in New Ash Green
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We strip the joint back and start again. If you have failed sealant between panels on a façade and joints with sealant missing in places, we can help.
External sealant needs dry, clean surfaces, so work around New Ash Green is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
Your job is guaranteed for a year, as with all our work.
- Place
- New Ash Green (DA3, TN15)
- Wider area
- Kent
- Cover
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Clear growth from the base of walls and joints
- Keep movement joints as flexible joints, not mortar
- Wash walls gently around the sealant
- Tell anyone working on the walls about the movement joints
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick.
Why deal with it now?
Sealing over the top of old mastic doesn’t hold for long. The new layer can’t bond properly to old, weathered material, so we always take the old sealant out. Older cottages and farmhouses around New Ash Green can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and agree the price before starting.
Why us?
- Colour picked to suit the job
- A 12-month guarantee on all work
- More than 20 years in sealant work
- Colour agreed with you before work begins
Landlords, agents and businesses in New Ash Green
Hotels need rooms back in use, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Surface by surface
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. That movement goes into the joint, so its sealant has to stay flexible.
Copings and trims
A failed coping joint lets water into the top of the wall. Sealing them early saves the wall below.
What happens on the day
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes anything from a few hours to several days, depending on the building and we leave things clean and tidy. In a small place like New Ash Green, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Mention if the joints have been sealed before
- For business premises, tell us about site rules or sign-in
Getting a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.
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New Ash Green questions
Can you help a landlord with a rental near Longfield station?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. Just ring 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Can you do external mastic in New Ash Green?
Yes, New Ash Green is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses.
Will you leave a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Will there be a smell?
There can be a smell while the sealant cures. Opening a window helps.
Can you reach joints on upper floors?
That depends on how high the joints are and the ground below. Ground-floor joints are simple; for higher work, tell us about the building and we’ll confirm what’s needed.
Why is there a gap in my brick wall?
Brickwork, render and cladding all move a little, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
How much does external mastic cost in New Ash Green?
We don’t 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.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
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.
Towns and villages near New Ash Green
More services for New Ash Green
Quotes for external mastic in New Ash Green
The price is agreed before any work begins. It takes into account:
- When we can work, for business premises
- How many rooms, windows or areas are involved
- The size of the job
- The product the joint needs
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts, so you know where you stand.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- If someone has resealed it before
- What the problem is, such as mould, gaps, leaks or cracking
- If it’s domestic, commercial or a hotel
- How many joints, rooms or windows are involved
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work and give you a clear price.