Kent · England
External Mastic in Walmer
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Walmer and across Kent. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Damp patches traced to an open external joint
- Plants rooting in failed movement joints
- Movement joints with cracked, split or missing sealant
The process
The work is kept neat and contained to the area we are working on. The job usually takes anything from a few hours to several days, depending on the building, and we explain the cure time before we leave. For a job in Walmer, 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 inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- 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.
Preparing for the visit
- Let us know about earlier repairs to the joints
- Let us know about parking restrictions
- Clear items away from the joints we’re working on
Getting a quote
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before work begins.
Related advice
External mastic in Walmer, done properly
Low-level joints can normally be done from the ground. For joints higher up, give us some details of the building and we’ll confirm what access is needed. We work on façade panels, concrete & block and brickwork movement joints, and the jobs we see most are damp patches traced to an open external joint and cracked joints where brick meets render or frames.
In and around Walmer, 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.
All of our work is guaranteed for twelve months, in Walmer and everywhere else we cover.
- Location
- Walmer (CT14)
- Region
- Kent
- Cover
- A year, on every job
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Places near Walmer
More services for Walmer
Aftercare tips
After the cure time, these simple habits help:
- Do not let climbing plants root in the sealant
- Have failed joints looked at early
- Wash walls gently around the sealant
- Look over the joints every year, ideally after winter
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.
Act while the splits are small. At that stage it’s a simple cut out and reseal before water has had years to get in.
Questions from Walmer
Does the coastal weather in Walmer affect outside sealant?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. Walls facing the sea are usually the first to need attention.
Do you cover smaller places like Walmer?
Yes. Walmer is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
How much does external mastic cost in Walmer?
Every job is different, so each one gets its own quote. To get one, ring 0345 464 0079 or drop us an email and tell us what needs doing and where.
Can a movement joint be filled with mortar?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. It needs a flexible sealant over backing rod.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
Is there any odour?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Do you have insurance?
Yes, we’re fully insured for domestic and commercial work.
Can you seal joints between render and window frames?
Yes. Materials like render, brick, metal and uPVC all move differently, so the joint between them must be flexible. We choose one that suits both surfaces.
Why it’s worth doing now in Walmer
Resealing a run of joints in one go is usually better than patching one at a time. They’ve weathered the same way, and access only has to be arranged once. Around Walmer, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before work begins.
Why Walmer clients choose us
- Anti-fungal silicone where joints get wet
- Homes, businesses and hotels
- A 12-month guarantee on all work
- ARBOMaster approved applicator
Take a look at our cost guide and our reviews.
Common problems we fix in Walmer
If plants are growing out of a joint, the sealant has normally failed or was never there. Roots and dirt hold water against the wall and make things worse.
Look out for these signs:
- Plants rooting in failed movement joints
- Gaps where render, brick and frames meet
- Joints where the bead has come unstuck
- Joints with sealant missing in places
Homes close to St Mary's Church include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What to look for in a quote
- Are they insured?
- What product goes in the joint
- Whether VAT is included
- What happens if they find a problem under the old sealant
What external mastic looks like in Walmer
Walmer is within about 1 mile of 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. 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.
For landlords with property near Walmer station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. For site and facilities teams at buildings such as The Downs Church of England Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Walmer is about 6 miles north-east of Dover, in Kent. Whether you are in the middle of Walmer or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Walmer is one of 922 towns and villages in Kent we cover. There’s also a page for Chelmsford, roughly 54 miles from Walmer.
Work in CT14 is quoted and booked the same way as anywhere else. If you need external mastic at a property on Lawn Road, York Road and Grams Road or a nearby road, our applicators can take on the job. You’ll find Walmer on the A258, so it’s easy for us to get to. Neighbouring places we cover for external mastic include Deal (1 mile north), Mill Hill (1 mile north-west), Great Mongeham (2 miles north-west), Sholden (2 miles north-west) and Ripple (2 miles west). Further out, we also cover Canterbury (15 miles west), Margate (12 miles north), Dover (6 miles south-west), Folkestone (13 miles south-west), Ramsgate (9 miles north) and Broadstairs (11 miles north).
Landmarks near Walmer
We work in homes and buildings around Goodwin Academy and The Telegraph pub, among other places. The nearest railway station is Walmer station, about 0.7 miles west. Well-known places in the area include Kent Museum of the Moving Image (1.4 miles north) and Walmer Castle (under half a mile south-east).
Work for landlords, hotels and businesses
Landlords and letting agents in Walmer can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
What affects the quote in Walmer
We don’t publish a price list, because jobs vary so much. The quote depends on:
- The number and length of the joints
- How easy the joints are to reach
- The old material and how stubborn it is
- When we can work, for business premises
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
Helping us quote
Before you ask for a quote, have a think about:
- If someone has resealed it before
- Where the property is
- How we’d reach the joints
- Roughly how big the job is
Need a quote? Please phone 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
What we cannot put right
It helps to know what we cannot do:
- Damp that is not coming from the joint
- Cracking across the wall rather than at a joint
- Render that is blown, hollow or coming away
If in doubt, phone 0345 464 0079 or email us and we will say what we think.
Where we work in Walmer
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
- Façade panels