Kent · England
External Mastic in Herne Bay
External mastic in Herne Bay from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Weathered mastic that no longer stretches
- Plants rooting in failed movement joints
- Failed seals between different materials
External mastic for homes and businesses in Herne Bay
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, so it bonds to the two sides only and can stretch. We work on copings & trims, brickwork movement joints and concrete & block, and the jobs we see most are leaking joints around cladding and façade panels and damp patches traced to an open external joint.
Extensions are a common sight on houses around Herne Bay, and the joint where new wall meets old is a classic place for water to get in. Getting the joint depth right matters as much as the sealant itself.
You’re covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or email us.
- Place
- Herne Bay (CT6)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost, so the problem grows beyond the joint itself. Gaps in sealant and mould in the bead never get better on their own, and in a busy household in Herne Bay they spread with every shower and every downpour. Replacing the sealant now is the simplest fix.
What you pay reflects the work, not guesswork. That’s why we ask a few questions first.
Why book with us
- An ARBOMaster approved applicator
- White, clear, grey or another colour, product permitting
- Every job guaranteed for a year
- Domestic, commercial and hotel work
Read what affects the cost or what customers say.
What sealant work cannot fix
Sealant isn’t the answer to every problem, and we’ll tell you before any work starts. Sealant will not put right:
- Render that’s blown, hollow or coming away
- Subsidence or other structural problems
- Cracked brickwork or render that needs a builder or plasterer
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
Where we work in Herne Bay
- Concrete & block
- Façade panels
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
For landlords and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will give you a quote.
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.
Outside joints around Herne Bay
Herne Bay is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on movement joints and outside wall joints, especially on the side facing the sea. 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.
Rented homes near Herne Bay station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. Schools such as Herne Bay Junior School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. For an older house near a landmark such as Christ Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Herne Bay is about 7 miles north of Canterbury, in Kent. Across the CT6 area, our applicators can take on external mastic. Our Kent coverage runs to 922 places, Herne Bay among them. Chelmsford is on our list too, around 38 miles away.
Postcode districts we cover here for external mastic: CT6. If you need external mastic at a property on High Street, Viscount Square and Market Street or anywhere close by, our applicators can take on the job. Main roads around Herne Bay include the A299 and B2205, so getting to you is simple. Close by, we work in Hunters Forstal (1 mile south-east), Eddington (1 mile south-west), Broomfield (1 mile south-east), Herne (1 mile south) and Beltinge (1 mile east). We also work in nearby towns such as Canterbury (7 miles south), Margate (11 miles east), Ramsgate (12 miles east), Broadstairs (13 miles east), Whitstable (5 miles west) and Deal (15 miles south-east).
Around Herne Bay
Around Herne Bay, our work takes us to homes and buildings near Herne Bay High School, Queen's Head Public House and Curtis Wood, among other places. The nearest railway station is Herne Bay station, roughly 0.7 miles west of the centre. A little further out are Tankerton Castle (4.3 miles west) and Whitstable and Tankerton Hospital (3.6 miles west). Green spaces nearby include West Blean and Thornden Woods.
Quotes for external mastic in Herne Bay
Every job gets its own quote. These are the things that affect it:
- The product the joint needs
- How many rooms, windows or areas are involved
- How much there is to do
- How easy the joints are to reach
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Asking for a quote
When you contact us, these details help:
- How many joints, rooms or windows are involved
- Any previous sealing or DIY work
- Access, such as stairs, a lift or height
- The address or postcode of the job
We quote each job on its own, so the first step is telling us about yours. Just ring 0345 464 0079 or send us an email with the details, and photos are welcome.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. Our tips:
- Look over the joints every year, ideally after winter
- Fix overflowing gutters above sealed joints
- Keep movement joints as flexible joints, not mortar
- Show decorators and builders where the movement joints are
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.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
How it works
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a few hours for a handful of joints, longer for a whole elevation. In Herne Bay, parking is rarely complicated, though it helps to know about driveways or restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- 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.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Mention any tricky access
- Let us know about earlier repairs to the joints
- Mention any leaks or damp you’ve noticed
Get a quote
If you’re in Herne Bay and need external mastic, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Read more
Also near Herne Bay
More services for Herne Bay
How the job changes by surface
Render joints
The face of render can be soft, so a sealant that stretches easily protects the edges. We prime where the product needs it.
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it. Tell us what the building has when you get in touch.
Herne Bay: your questions answered
Do you cover Herne Bay for external mastic?
Yes, Herne Bay is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.
I let a flat near Herne Bay station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Do you use backing rod?
That’s backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only so it can flex with the joint.
Are you insured?
Yes. Mr Mastic is fully insured, and we have been doing sealant work for more than 20 years.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
When will the joints need doing again?
That depends on the wall, the weather and the movement. Signs to watch for are cracking, hardening and gaps at the edges and have them redone then.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.