Kent · England
External & façade joints in Wilmington, Kent
External mastic for Wilmington and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Rain getting behind render or cladding at a joint
- Joints pointed up with cement by mistake
- Moss and dirt in joints with no sealant left
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Clear growth from the base of walls and joints
- Walk round the building once a year and look at the joints
- Never let anyone fill a movement joint with mortar
- Point out the joints to other trades
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.
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.
About our external mastic in Wilmington
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We take the old material out and do it properly. Common call-outs are for hard, crazed mastic that has stopped moving and sealant pulling away from one side of the joint, across brickwork movement joints, copings & trims and render & cladding joints.
Outside joints can only be sealed when they’re dry, so work in Wilmington is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
Whatever the size of the job, you get the same one-year guarantee in Wilmington and across Kent.
- Location
- Wilmington (DA2, DA5, DA1)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Outside joints around Wilmington
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Hall Place and Gardens (about 1.7 miles north-west) nearby, there’s older building stock in the area around Wilmington as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Rented homes near Crayford station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. Schools such as Wilmington Grammar School for Girls are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Wilmington is about 2 miles south-west of Dartford, in Kent. Every kind of property in Wilmington is covered for external mastic. The work is guaranteed for a year. Across Kent, we cover 922 places, Wilmington among them. London is on our list too, around 13 miles away.
Postcode districts we cover here for external mastic: DA2, DA5 and DA1. External mastic is available to properties on Common Lane, Parsons Lane and Oakfield Lane and the roads around them. Wilmington sits on or near the A2, which makes travel easy. We also cover Bowmans (1 mile north), Joyden's Wood (1 mile west), Puddledock (1 mile south-west), Coldblow (1 mile north-west) and Crayford (1 mile north). We also work in nearby towns such as Sevenoaks (10 miles south), Gravesend (8 miles east), Northfleet (7 miles east), Kings Hill (14 miles south-east), Swanscombe (5 miles east) and Windmill Hill (8 miles east).
Near you in Wilmington
Typical jobs here are in homes near Dartford Heath, The Plough pub and Wilmington Primary School. For rail, the closest station is Crayford station, about 1.3 miles north. Nearby you will also find Stone Castle (4 miles east) and West Hill Hospital (1.4 miles north-east). Not far away are Wansunt Pit.
Also near Wilmington
More services for Wilmington
Questions from Wilmington
Can you help a landlord with a rental near Crayford station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Can you do external mastic in Wilmington?
Yes, Wilmington is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear quote.
Will you leave a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Why is there a gap in my brick wall?
A vertical gap in a long brick wall is usually a movement joint. It gives the wall room to move.
Is it OK to seal over old sealant?
No, because it fails. The old sealant always comes out first.
How long should I leave it?
Different products cure at different speeds, so follow the cure time we give you when we finish.
How do I get a quote for external mastic in Wilmington?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We will tell you what we are using and why.
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in Wilmington and across Kent. Several sites can be quoted together, and we are fully insured for the work.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can be quoted together.
When to call us in Wilmington
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.
Keep an eye out for any of the following:
- Rain getting behind render or cladding at a joint
- Failed sealant between panels on a façade
- Hard, crazed mastic that has stopped moving
- Gaps where render, brick and frames meet
If you live in an older home near St Barnabas, an extension built onto an older house moves differently, and the joint between them takes the strain.
Comparing quotes
- The length of the guarantee
- Whether all the old sealant comes out first
- How the joint is cleaned and prepared
- Whether the sealant suits the joint
Why act early in Wilmington
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render around the joint, so the damage spreads beyond the joint. Where a wall is exposed, as many are in small places like Wilmington, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
What you pay reflects the work, not guesswork. That is why we ask about the job first and agree the price before starting.
What you get with us
- Sanitary silicone with an anti-fungal additive in wet areas
- Fully insured
- Rated 4.9 stars on Google
- Quality sealants from Arbo and Everbuild
See how sealant jobs are priced and our reviews.
Quotes for external mastic in Wilmington
You’ll get a clear quote before work begins. It’s based on:
- Whether there’s mould to deal with
- The size of the job
- How much old sealant there is and how hard it is to remove
- The product the joint needs
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Ask us for a quote and we will go through it with you.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- Access, such as stairs, a lift or height
- Where the property is
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it’s a home or a business
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you are ready, phone 0345 464 0079 or send us an email.
What we do, step by step
Good joint work is mostly preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. In total, it generally takes anything from a few hours to several days, depending on the building. For a village or hamlet like Wilmington, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Clear items away from the joints we are working on
- Keep pets and children clear of the area while we work
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
Getting a quote is simple: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we will take it from there.
Read more
How the job changes by surface
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
Render joints
Render has movement joints and stop beads that need sealing. They’re resealed in a sealant that suits the render.