Kent · England
External & façade joints in Ash, Kent
External mastic in Ash from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Joints pointed up with cement by mistake
- Water getting into walls through failed joints
- Sealant that has lost its bond to the brick or render
External mastic in Ash, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. If you are dealing with joints with sealant missing in places and sealant pulling away from one side of the joint, we can help, whatever the surface.
In and around Ash, older properties sit alongside newer ones, each with its own outside joints. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
Every job is covered by a 12-month guarantee.
- Place
- Ash (CT3)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Questions from Ash
I let a flat near Sandwich station. Can you help?
Yes, landlords and agents are among the people we work for. Just ring 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 Ash for external mastic?
Yes, Ash is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we’ll send you a clear quote.
How long will you be here?
It depends on the size of the job, but most jobs take a few hours for a handful of joints, longer for a whole elevation. We will tell you when we quote.
What sealant do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. The sealant is matched to both sides.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
How long does external mastic last?
It depends on the exposure, the movement and the product. Treat it as a maintenance item and look at it yearly.
Where do you work from?
We’re based in Crawley, and we work across South East England, London and Scotland.
Places near Ash
Also in Ash
What affects the cost of external mastic
You’ll get a clear quote before work begins. It’s based on:
- Any working-time requirements on site
- The old material and how stubborn it is
- How easy the joints are to reach
- The product the joint needs
Doing several joints on one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. We will give you a clear quote for the lot.
What to tell us for a quote
You do not need to know the technical terms. Just tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- A few photos by email, if you can
- Where the job is, and your postcode
- Roughly how big the job is
If you are in Ash and need external mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
When to call us in Ash
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
Any of these means the joints need attention:
- Moss and dirt in joints with no sealant left
- Water getting into walls through failed joints
- Failed sealant between panels on a façade
- Joints pointed up with cement by mistake
If you look after a building such as Ash Cartwright and Kelsey Church of England Primary School, larger buildings have long runs of movement joint that eventually need resealing.
What your quote should include
- How hidden problems are handled
- The length of the guarantee
- How the surfaces are prepared before sealing
- How long to leave it before use
What the job involves on each surface
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Walls and rooflines in Ash
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Goodnestone Park (about 3.3 miles south-west) nearby, there’s older building stock in the area around Ash as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
In the older streets around Church of St Nicholas, old and new materials meet at the roofline and walls, which is where sealant earns its keep. For landlords with property near Sandwich station, outside joints that have cracked can let damp into a rental, so check them between lets.
Ash is about 7 miles north-west of Deal, in Kent. Ash gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Ash is one of 922 places in Kent where we work for external mastic. Chelmsford is on our list too, about 47 miles from Ash.
Postcode districts we cover here for external mastic: CT3. If you need external mastic at a property on The Street, Goodban Square and Chilton Place or anywhere close by, we can help. If you’re just outside Ash, we cover Guilton (1 mile west), Weddington (1 mile north-east), Durlock (1 mile west), Cop Street (1 mile north) and Coombe (1 mile south-east). Larger places within reach include Canterbury (9 miles west), Margate (8 miles north-east), Dover (10 miles south), Folkestone (14 miles south), Ramsgate (7 miles north-east) and Broadstairs (9 miles north-east).
Landmarks near Ash
Typical jobs here are in homes near The Chequer Inn. For rail, the closest station is Sandwich station, roughly 2.8 miles east of the centre. Well-known places in the area include White Mill (2.1 miles east). For a walk, there’s Monk's Wall nature reserve.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Keep high-pressure jets off the joints
- Walk round the building once a year and look at the joints
- Keep movement joints as flexible joints, not mortar
- Act on the first splits you see
Only paint over the joint if we’ve confirmed the sealant can take paint. Many exterior sealants aren’t designed to be painted, and paint can crack as the joint moves.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick.
How the visit works
Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it normally takes a few hours to a few days, depending on the length of joint and the access. For a job in Ash, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- 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.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Mention if the joints have been sealed before
- Let us know about stairs, lifts or work at height
- Tell us about any water getting in
Ask for a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
Advice
Why it’s worth doing now in Ash
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and does not last. In a smaller place like Ash, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will go through it with you.
What you get with us
- ARBOMaster approved applicator
- 180+ five-star Google reviews
- Homes, businesses and hotels
- A choice of colours where the product allows