Kent · England
External & façade joints in Ash, Kent
External mastic for Ash, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Rain getting behind render or cladding at a joint
- Joints pointed up with cement by mistake
- Joints where the bead has come unstuck
External mastic in Ash
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Porous or awkward surfaces are primed where the sealant needs it, and we don’t skip that step. We are often asked to deal with gaps where render, brick and frames meet and sealant pulling away from one side of the joint, across render & cladding joints, concrete & block and façade panels.
Around Ash, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
Whatever the size of the job, you get the same 12-month guarantee.
- Location
- Ash (TN15, DA3)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
The process
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours for a handful of joints, longer for a whole elevation. Somewhere like Ash needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Mention any parking rules near the property
- Tell us about any water getting in
- For indoor joints, keep the area dry beforehand if you can
Get a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we will come back to you with a quote.
Advice
Ash buildings and the weather
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 Lullingstone Castle (about 4.2 miles west) are a reminder that the area around Ash 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.
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 an older house near a landmark such as Parish Church of Saint Peter and Saint Paul, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Ash is about 6 miles south-west of Northfleet, in Kent. Our applicators cover external mastic for homeowners, landlords and businesses in Ash and the surrounding area. Across Kent, we cover 922 places, and Ash is one of them. You can also see our page for London, about 19 miles away.
We cover every part of the TN15 and DA3 postcode area for external mastic. If you need external mastic at a property on Ash Road, The Street and Billet Hill or anywhere close by, we can help. If you are just outside Ash, we cover West Yoke (1 mile north), Fawkham Green (1 mile north-west), Speed Gate (1 mile north-west), Stansted (2 miles south) and West Kingsdown (2 miles south-west). We also work in nearby towns such as Maidstone (12 miles south-east), Dartford (7 miles north-west), Sevenoaks (7 miles south-west), Royal Tunbridge Wells (15 miles south), Gravesend (6 miles north-east) and Tonbridge (11 miles south).
Local landmarks in Ash
We work in homes and buildings around The White Swan Public House and the streets around them. Ash’s nearest station is Longfield station, roughly 2.8 miles north. Nearby you will also find Darent Valley Hospital (5.6 miles north) and Eynsford Castle (3.6 miles west).
Ash: your questions answered
Do you cover Ash for external mastic?
Yes, Ash is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
Can you help a landlord with a rental near Longfield station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll send you a clear quote.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you don’t need to watch us work.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice.
Is it messy?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Is there a guarantee?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we will put it right.
Do you take out the old sealant first?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We will tell you how long to leave the joint.
Nearby places to Ash
Also in Ash
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
What we can’t put right
New sealant can’t fix everything, and we’ll tell you before work begins. It will not solve:
- Cracked brickwork or render that needs a builder or plasterer
- Rising or penetrating damp from elsewhere in the wall
- Walls that need new movement joints cut into them
If you are not sure, just phone 0345 464 0079 or send us an email and we will give you a straight answer.
Surfaces we seal
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Façade panels
- Render & cladding joints
- Copings & trims
Quotes for external mastic in Ash
The quote reflects the job in front of us. We look at:
- The old material and how stubborn it is
- Any working-time requirements on site
- Any mould that needs treating
- The type of sealant required
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Asking for a quote
You do not need to know the technical terms. It helps if you can tell us:
- The problem you’ve noticed
- Roughly how big the job is
- Access, such as stairs, a lift or height
- Any previous sealing or DIY work
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
How the job changes by surface
Copings and trims
A failed coping joint lets water into the top of the wall. Sealing them early saves the wall below.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.
What happens if it’s left?
Water gets in through a failed movement joint. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. Around Ash, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, call 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
Why Ash customers choose us
- Experience in homes, commercial sites and hotels
- We never seal over old sealant
- 180+ five-star Google reviews
- Arbo and Everbuild products
Take a look at our cost guide and what customers say.
Do you need external mastic in Ash?
Sunlight, wet weather and frost wear exterior sealant down. Over the years it hardens, cracks on the surface and loses its give, so the joint eventually tears or comes away from one side.
Keep an eye out for any of the following:
- Cracked joints where brick meets render or frames
- Movement joints filled with mortar instead of sealant
- Damp patches traced to an open external joint
- Plants rooting in failed movement joints
If you look after a building such as New Ash Green Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What your quote should include
- How long to leave it before use
- What happens if they find a problem under the old sealant
- What guarantee comes with the work
- How the joint is cleaned and prepared