Kent · England
External Mastic in St Mary's Bay
External mastic for St Mary's Bay, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Damp patches traced to an open external joint
- Sealant pulling away from one side of the joint
- Gaps where render, brick and frames meet
Honest limits
It helps to know what we cannot do too:
- Walls that need new movement joints cut into them
- Damp that is not coming from the joint
- Cracking across the wall rather than at a joint
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly.
What we seal
- Façade panels
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
External mastic for homes and businesses in St Mary's Bay
For buildings in St Mary's Bay, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean, sound faces and a controlled depth. We work on copings & trims, brickwork movement joints and concrete & block, and people most often call us about failed seals between different materials and failed sealant between panels on a façade.
In a smaller place like St Mary's Bay, some homes face open ground, so exposed walls and rooflines take more wind-driven rain. Joints on those sides are generally the first to go.
Whatever the size of the job, you get the same one-year guarantee.
- Location
- St Mary's Bay (TN29)
- Region
- Kent
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Landlord and commercial work in St Mary's Bay
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
Why it’s worth doing now in St Mary's Bay
Sealing over the top of old mastic doesn’t hold for long. New sealant doesn’t bond well to old, weathered sealant, so we always take the old sealant out. In a smaller place like St Mary's Bay, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
Combining jobs into one visit normally makes better use of the time than several visits. We will give you a clear quote for the lot.
What you get with us
- Any old sealant cut out fully, not covered over
- We are fully insured
- White, clear, grey or another colour, product permitting
- Anti-fungal sanitary silicone in wet areas
Take a look at our cost guide and what customers say.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Have failed joints looked at early
- Check external joints each spring
- Clear growth from the base of walls and joints
- Wash walls gently around the sealant
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
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.
Quotes for external mastic in St Mary's Bay
The quote reflects the job in front of us. We take into account:
- The number and length of the joints
- The number of rooms or windows
- The product the joint needs
- Any working-time requirements on site
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. You will have a clear quote before any work starts, so you know where you stand.
What to tell us for a quote
What to tell us when you ask for a quote:
- The address or postcode of the job
- The type of property
- Pictures of the joints, sent by email
- Roughly how big the job is
Every job is quoted individually, so start by telling us what you need. Just phone 0345 464 0079 or email us with the details.
St Mary's Bay questions
Will you come out to St Mary's Bay?
Yes. St Mary's Bay is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover St Mary's Bay for external mastic?
Yes, St Mary's Bay is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear price.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used before we leave.
Do you hold any approvals?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Is there any odour?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Can you seal joints between two different materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. We pick a colour that works with both materials.
Why do you put foam in the joint first?
That’s backing rod, a closed-cell foam. It stops the sealant going in too deep and bonding to three sides, which would stop it stretching.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
The process
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes anything from a few hours to several days, depending on the building. In a smaller place like St Mary's Bay, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Mention if the joints have been sealed before
- Where the joints are inside, avoid wetting them before we arrive
- On commercial sites, let us know about site rules
Get a quote
If you’re in St Mary's Bay and need external mastic, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Related advice
What external mastic looks like in St Mary's Bay
St Mary's Bay is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. 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, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as The Marsh Academy, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. In the older streets around All Saints, older walls, gutters and the joints where extensions meet them need a flexible sealant.
St Mary's Bay is about 6 miles south-west of Hythe, in Kent. For external mastic in and around St Mary's Bay, it’s easy to get a quote: please call 0345 464 0079 or email us. We are based in Crawley and cover Kent, St Mary's Bay included. St Mary's Bay is one of 922 places in Kent we cover. We also work in Brighton, about 50 miles from St Mary's Bay.
Work in TN29 is quoted and booked the same way as anywhere else. That includes homes and businesses on Maple Drive, Oak Drive and Beechwood Close and the roads around them. Other places close to St Mary's Bay include St Mary in the Marsh (1 mile west), Burmarsh (3 miles north), Newchurch (3 miles north-west), Postling Green (5 miles north) and Bonnington (6 miles north). Within a short drive, we also cover Ashford (10 miles north-west), Folkestone (10 miles north-east), Hythe (6 miles north-east), Hawkinge (11 miles north-east), Tenterden (13 miles west) and Cheriton (9 miles north-east).
Landmarks near St Mary's Bay
In St Mary's Bay, that means homes and buildings near Romney Warren Country Park and the streets around them. A little further out are Romney 'castle' (3.6 miles west).
Different surfaces, different methods
Cladding and façade panels
Panels heat up and cool down quickly, so the joint sealant has to cope with frequent movement. We choose the product to suit.
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. We seal the joint with a flexible exterior sealant so neither cracks the other.