Kent · England
External Mastic in Sellindge
We cover Sellindge for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Panel joints letting water in
- Rigid filler in a joint that should flex
- Water getting into walls through failed joints
External mastic in Sellindge, done properly
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant all tend to fail early. We take the old material out and do it properly. Typical jobs include weeds or debris growing in open joints and failed seals between different materials, across joints between brick and frames, render & cladding joints and concrete & block.
Around Sellindge, 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.
Big or small, it’s backed by our 12-month guarantee.
- Location
- Sellindge (TN25)
- Region
- Kent
- Cover
- A year, on every job
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Common questions in Sellindge
Is Sellindge within the area you cover?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you work for landlords with property near Westenhanger station?
Yes. We work for letting agents and landlords as well as homeowners. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
How much does external mastic cost in Sellindge?
Every job is different, so each one gets its own quote. For a quick quote, call 0345 464 0079 or send us an email with a short description of the job.
Where do you work from?
Our base is in Crawley, and we work across South East England, London and Scotland.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
Is the work guaranteed?
Yes. All our work carries our 12-month guarantee.
What do you put in the joint?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
When is the sealant fully cured?
It depends on the product. Before we leave, we’ll tell you the cure time.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
A careful DIYer can reseal a simple joint, 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.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Look over the joints every year, ideally after winter
- Get split or bare joints resealed while the damage is small
- Point out the joints to other trades
- Fix overflowing gutters above sealed joints
Follow the cure time we give you before the joint is knocked or disturbed. Most exterior sealants skin fast but take longer to cure right through.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
More services for Sellindge
What affects the quote in Sellindge
For a quick quote, just ask. The main things that affect it are:
- The old material and how stubborn it is
- How many rooms, windows or areas are involved
- The size of the job
- Any mould that needs treating
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
Helping us quote
Before you ask for a quote, have a think about:
- The problem you’ve noticed
- If it’s domestic, commercial or a hotel
- The rough size of the job
- Where the property is
If you are in Sellindge and need external mastic, ring 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.
How the job changes by surface
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two.
Common problems we fix in Sellindge
Sometimes a movement joint was filled with mortar or a rigid filler, often by someone who didn’t know what it was for. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
The most common problems we see are:
- Hard, crazed mastic that has stopped moving
- Moss and dirt in joints with no sealant left
- Joints pointed up with cement by mistake
- Cracked joints where brick meets render or frames
Managing a site like Sellindge Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
What to look for in a quote
- What guarantee comes with the work
- Whether they’re fully insured
- Is the old sealant removed completely?
- How the surfaces are prepared before sealing
The process
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes anything from a few hours to several days, depending on the building. Somewhere as small as Sellindge, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- Clear items away from the joints we’re working on
- Keep children and pets away from the work area
- Mention any sign-in or site rules at work premises
Get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. Whenever you are ready, ring 0345 464 0079 or send us an email.
Related advice
Walls and rooflines in Sellindge
With historic houses such as Westenhanger Castle (about 1.4 miles south-east) nearby, there’s older building stock in the area around Sellindge as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. 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.
Rented homes near Westenhanger station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. Homes close to Church of St Mary include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Sellindge is about 4 miles north-west of Hythe, in Kent. From the centre of Sellindge to the outskirts, external mastic is available for homes and businesses alike. Our Kent coverage runs to 922 places, and Sellindge is one of them. Our Chelmsford page covers work nearby, about 49 miles away.
Postcode districts we cover here for external mastic: TN25. External mastic is available to properties on Downs Way, Woodlees Close and Swan Green. Close by, we work in Moorstock (1 mile north), Stanford (2 miles east), Postling (3 miles east), Stowting (3 miles north-east) and Skeete (3 miles north-east). Larger places within reach include Ashford (6 miles north-west), Canterbury (13 miles north), Dover (13 miles east), Folkestone (7 miles east), Faversham (15 miles north) and Hythe (4 miles south-east).
Around Sellindge
The closest station to Sellindge is Westenhanger station, about 1.6 miles south-east of the centre. Other landmarks nearby include William Harvey Hospital (4.7 miles north-west) and Lympne Castle (2.4 miles south). The countryside around Sellindge includes Tolsford Hill and Hatch Park.
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- Walls that need new movement joints cut into them
- Render that is blown, hollow or coming away
- Rising or penetrating damp from elsewhere in the wall
Not sure which it is? You can ring 0345 464 0079 or send us an email and we will tell you honestly before booking.
What we seal
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Façade panels
- Brickwork movement joints
- Copings & trims