Kent · England
St Mary in the Marsh External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in St Mary in the Marsh and across Kent. Fully insured, ARBOMaster approved and guaranteed for a year.
- Joints pointed up with cement by mistake
- Sealant that has lost its bond to the brick or render
- Hard, crazed mastic that has stopped moving
What we do, step by step
When we arrive, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before any work begins. Most jobs take a few hours for a handful of joints, longer for a whole elevation. Somewhere like St Mary in the Marsh needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Keep children and pets away from the work area
- On commercial sites, let us know about site rules
- Move anything stored near the joints
Get a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we’ll explain what’s involved and give you a clear quote.
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External mastic in St Mary in the Marsh, done properly
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. The colour is chosen to suit the brick or render so the line blends in. If you have cracked joints where brick meets render or frames and sealant pulling away from one side of the joint, we can put it right, whatever the surface.
External sealant needs dry, clean surfaces, so work around St Mary in the Marsh is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
Each job carries a 12-month guarantee, large or small.
- Place
- St Mary in the Marsh (TN29)
- Region
- Kent
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Leave it or put it right?
Running new sealant over the old bead rarely lasts. New sealant does not bond well to old, weathered sealant, so the old joint is cut out fully first. In a small place like St Mary in the Marsh, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and give you a clear quote before we start.
Why book with us
- Full insurance on every job
- Anti-fungal silicone where joints get wet
- You choose the colour before work begins
- Quality sealants from Arbo and Everbuild
What affects the quote in St Mary in the Marsh
Every job gets its own quote. These are the things that affect it:
- Whether there’s mould to deal with
- Any working-time requirements on site
- The product the joint needs
- The number and length of the joints
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
Asking for a quote
There’s no need for technical detail. It helps if you can tell us:
- Any access issues, like height or stairs
- Pictures of the joints, sent by email
- Where the job is, and your postcode
- Any previous sealing or DIY work
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job, and we will take it from there.
Places near St Mary in the Marsh
What else we do in St Mary in the Marsh
Different surfaces, different methods
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
Cladding and façade panels
If the façade has a specified sealant, that’s what we use or an approved alternative. Send us any details you have about the façade.
Your questions about external mastic in St Mary in the Marsh
Does living near the coast affect external mastic in St Mary in the Marsh?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. It’s worth checking the walls that face the sea first.
Will you come out to St Mary in the Marsh?
Yes. St Mary in the Marsh 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.
What does external mastic cost?
It depends on the job, so we quote each one individually. For a quick quote, ring 0345 464 0079 or send us an email with a short description of the job.
What information do you need?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or email us.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Pointing it stops it working. We will reseal it with a flexible sealant.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator and we’re fully insured too.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
DIY versus a professional finish
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
When it is not the sealant
It helps to know what we can’t do too:
- Cracks in the bricks or render themselves, away from the joints
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Subsidence or other structural problems
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Surfaces we seal
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Concrete & block
- Façade panels
- Joints between brick and frames
Walls and rooflines in St Mary in the Marsh
St Mary in the Marsh is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For an older house near a landmark such as Church of St Mary the Virgin, older walls, gutters and the joints where extensions meet them need a flexible sealant.
St Mary in the Marsh is about 7 miles south-west of Hythe, in Kent. Whether you’re in the middle of St Mary in the Marsh or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our area takes in 922 places across Kent, from the larger towns to small villages. You can also see our page for Brighton, roughly 48 miles from St Mary in the Marsh.
Work in TN29 works the same way as everywhere else we cover. Whether your property is on Wades Close, Rectory Road and Pickneybush Lane or a nearby road, we can help. Close by, we work in St Mary's Bay (1 mile east), Newchurch (2 miles north), Burmarsh (3 miles north-east), Postling Green (5 miles north) and Bonnington (5 miles north). Larger places within reach include Ashford (9 miles north), Folkestone (11 miles north-east), Hythe (7 miles north-east), Hawkinge (12 miles north-east), Tenterden (12 miles west) and Cheriton (10 miles north-east).
Local landmarks in St Mary in the Marsh
In St Mary in the Marsh, that means homes and buildings near Romney Warren Country Park and The Star Inn. Well-known places in the area include Romney 'castle' (2.5 miles south-west) and Brenzett Aeronautical Museum (3.5 miles west).
Signs you need external mastic in St Mary in the Marsh
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Any of these means the joints need attention:
- Movement joints filled with mortar instead of sealant
- Rain getting behind render or cladding at a joint
- Cracked joints where brick meets render or frames
- Leaking joints around cladding and façade panels
For site and facilities teams at buildings such as The Marsh Academy, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Questions to ask before you book
- Is VAT in the price?
- Which colour the sealant will be
- Whether they seal over old material or remove it
- What the cure time is