Kent · England
External Mastic in Hamstreet
Our applicators work in Hamstreet on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Gaps where render, brick and frames meet
- Plants rooting in failed movement joints
- Sealant pulling away from one side of the joint
How we quote for external mastic
Your quote is based on your job. We take into account:
- Mould in or behind the old joints
- The size of the job
- The old material and how stubborn it is
- Working hours on commercial sites
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part.
Helping us quote
You don’t need to know the technical terms. Just tell us:
- Whether it has been sealed before
- A few pictures by email, if you can
- Whether it’s a home or a business
- Where the job is, and your postcode
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll talk you through the work and give you a clear price.
How we handle external mastic in Hamstreet
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant all tend to fail early. We strip the joint back and start again. Typical jobs include joints pointed up with cement by mistake and water getting into walls through failed joints, on copings & trims, brickwork movement joints and façade panels.
External sealant needs dry, clean surfaces, so work around Hamstreet is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
You are covered for a year from the day we finish. If anything isn’t right with it, call 0345 464 0079 or email us.
- Where
- Hamstreet (TN26)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Some sealant jobs are within reach of a careful DIYer, 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.
Outside joints around Hamstreet
The South East is one of 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 Ham Street station, outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as Church of the Good Shepherd, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Hamstreet is about 5 miles south of Ashford, in Kent. Hamstreet gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Hamstreet is one of 922 places in Kent where we work. There’s also a page for Crawley, roughly 45 miles from Hamstreet.
Every address in TN26 is within our area for external mastic, from the main roads to the quietest streets. That includes homes and businesses on The Street, Dukes Meadow and Rectory Walk and the roads around them. We also cover Orlestone (1 mile north-west), Ruckinge (1 mile east), Kenardington (2 miles west), Bromley Green (2 miles north) and Stone Cross (2 miles north-east). We also work in nearby towns such as Ashford (5 miles north), Folkestone (14 miles east), Hythe (10 miles east), Hawkinge (14 miles east), Tenterden (7 miles west) and Cheriton (13 miles east).
Local landmarks in Hamstreet
Around Hamstreet, our work takes us to homes and buildings near The Dukes Head pub. There’s a railway station in Hamstreet itself: Ham Street station. Nearby you’ll also find Brenzett Aeronautical Museum (3.9 miles south) and William Harvey Hospital (5.8 miles north-east). Open spaces near Hamstreet include Orlestone Forest.
How it works
There’s no need to move everything out, only the area right around the joints. Everything nearby is protected, and the work takes a few hours for a handful of joints, longer for a whole elevation for a typical job. In a small place like Hamstreet, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- Both sides are cleaned back to sound material and primed if needed.
- 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
- Where the joints are inside, avoid wetting them before we arrive
- Mention any sign-in or site rules at work premises
- Let us know about parking restrictions
Get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Advice
Honest limits
We won’t take on work that will not last, so these are the limits:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Movement that’s more than a sealant joint can take
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
Surfaces we seal
- Joints between brick and frames
- Copings & trims
- Façade panels
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
Places near Hamstreet
What else we do in Hamstreet
Signs you need external mastic in Hamstreet
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
Signs it’s time to call us include:
- Cracked joints where brick meets render or frames
- Rigid filler in a joint that should flex
- Failed sealant between panels on a façade
- Damp patches traced to an open external joint
For site and facilities teams at buildings such as Hamstreet Primary Academy, larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before you book
- How the colour is chosen
- How hidden problems are handled
- What preparation is included
- What the cure time is
What happens if it’s left?
Sealing over the top of old mastic does not hold for long. New sealant does not bond well to old, weathered sealant, so we always take the old sealant out. Older cottages and farmhouses around Hamstreet can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Combining jobs into one visit is usually more efficient than separate visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
Why book with us
- Homes, businesses and hotels
- Over 20 years’ experience
- Fully insured
- Tidy, careful work
Read our cost guide and our reviews.
Your questions about external mastic in Hamstreet
Is Hamstreet in your area for external mastic?
Yes, Hamstreet is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing, and we’ll send you a clear quote.
Do you cover smaller places like Hamstreet?
Yes. Hamstreet 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.
Is there any odour?
There can be a smell while the sealant cures. Ventilation helps.
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.
Do you work for landlords and businesses?
Yes, often. We can quote for several properties at once, and between tenancies is a good time for the work.
Will you leave a mess?
No. The area is protected while we work and cleaned up afterwards.
Can you seal over the old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Where do you work from?
Our base is Crawley. Our area covers South East England, London and Scotland.
Landlords, agents and businesses in Hamstreet
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.