Kent · England
External Mastic in Seasalter
Problem with your movement joints in Seasalter? We remove the old material, prepare the joints and seal them properly.
- Brick movement joints where the sealant has split
- Rigid filler in a joint that should flex
- Rain getting behind render or cladding at a joint
About our external mastic in Seasalter
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. Typical jobs include movement joints filled with mortar instead of sealant and joints where the bead has come unstuck, across concrete & block, joints between brick and frames and façade panels.
Around Seasalter, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water usually gets in.
Every job comes with a one-year guarantee.
- Location
- Seasalter (CT5)
- Wider area
- Kent
- Cover
- A year, on every job
- Price
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
For landlords and businesses
If you manage several properties in or around Seasalter, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
What happens on the day
At the end, we look at the finished work together and explain the cure time. The work normally takes a few hours for a handful of joints, longer for a whole elevation, depending on the amount of work. For a village or hamlet like Seasalter, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- Keep children and pets away from the work area
- Clear the area around the work
- Mention any parking rules near the property
Ask for a quote
If you are in Seasalter and need external mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
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What affects the quote in Seasalter
The price is agreed before any work begins. It’s based on:
- The number and length of the joints
- Mould in or behind the old joints
- Which sealant suits the joint
- How many areas need sealing
What it costs depends on how much there is to do, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Helping us quote
You do not need to know the technical terms. Just tell us:
- The type of property
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
- Where the property is
We quote each job on its own, so start by telling us what you need. Just ring 0345 464 0079 or drop us an email with the details.
Outside joints around Seasalter
Seasalter is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Whitstable station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to Seasalter Christian Centre include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Seasalter is about 2 miles west of Whitstable, in Kent. Wherever you are in the CT5 postcode area, we cover external mastic for homes and businesses. Seasalter is one of 922 towns and villages in Kent we cover. Our Chelmsford page covers work nearby (35 miles or so).
Our applicators cover all of CT5 for external mastic and the streets around it. You will find streets such as Eden Road, Allan Road and Church Lane. Other places close to Seasalter include Highstreet (1 mile south), Waterham (2 miles south-west), Dargate (2 miles south), Graveney (3 miles south-west) and Hernhill (3 miles south-west). Within a short drive, we also cover Ashford (15 miles south), Canterbury (6 miles south-east), Sittingbourne (11 miles west), Faversham (5 miles south-west), Herne Bay (6 miles east) and Minster (10 miles north-west).
Near you in Seasalter
Around Seasalter, our work takes us to homes and buildings near The Jolly Sailor pub, The Whitstable School and Seasalter Levels, among other places. For rail, the closest station is Whitstable station, roughly 1.8 miles north-east. A little further out are Tankerton Castle (2 miles north-east) and Whitstable and Tankerton Hospital (2.5 miles north-east). The countryside around Seasalter includes Blean Woods RSPB Reserve.
Do you need external mastic in Seasalter?
If plants are growing out of a joint, the sealant has generally failed or was never there. Dirt and roots then trap moisture in the joint and make things worse.
The most common problems we see are:
- Damp patches traced to an open external joint
- Rigid filler in a joint that should flex
- Hard, crazed mastic that has stopped moving
- Weeds or debris growing in open joints
Managing a site like Joy Lane Primary Foundation School? Then its movement joints, gutters and trims need looking after like any other building’s.
Comparing quotes
- What preparation is included
- What the quote includes, VAT included or not
- Whether all the old sealant comes out first
- Which sealant they’ll use, and why
Common questions in Seasalter
Does the coastal weather in Seasalter affect outside sealant?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. Walls facing the sea are usually the first to need attention.
Do you cover smaller places like Seasalter?
Yes, Seasalter is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you work for landlords and businesses?
Yes, we do. Domestic, commercial and hotel work are all part of what we do.
What is a movement joint?
A vertical gap in a long brick wall is generally a movement joint. It gives the wall room to move and needs a flexible seal, not mortar.
What does external mastic cost?
Size, access and the old material all affect the cost. Call for a quick quote.
How long does external mastic last?
It varies with how exposed the wall is and how much the joint moves. Look for splits, hardening or edges coming away, and reseal at that point.
Do you take out the old sealant first?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Do I have to be there?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Look over the joints every year, ideally after winter
- Show decorators and builders where the movement joints are
- Avoid pressure-washing directly into sealant joints
- Leave the joints unpainted unless we’ve said otherwise
Don’t paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants are not designed to be painted and spoil the finish.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
Also near Seasalter
What else we do in Seasalter
What the job involves on each surface
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so its sealant has to stay flexible.
Leave it or put it right?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. A stiffer product can damage the joint edge as it fails. Around Seasalter, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Ask us for a quote and we will go through it with you.
Why book with us
- ARBOMaster approved applicator
- A sealant colour to suit the surroundings
- A 12-month guarantee on all work
- Homes, businesses and hotels