East Sussex · England
External Mastic in Sweethaws
External mastic across Sweethaws and nearby, with old sealant always removed completely and a 12-month guarantee.
- Damp patches traced to an open external joint
- Joints pointed up with cement by mistake
- Brick movement joints where the sealant has split
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Leave the joints unpainted unless we have said otherwise
- Tell anyone working on the walls about the movement joints
- Deal with leaking gutters that soak the joints below
- Make sure movement joints are not pointed over
Don’t paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint, and paint can crack as the joint moves.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick.
How we handle external mastic in Sweethaws
Joints in render and cladding are easy to overlook until a damp patch appears. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product. Common call-outs are for failed sealant between panels on a façade and joints with sealant missing in places, across concrete & block, joints between brick and frames and render & cladding joints.
Outside joints can only be sealed when they’re dry, so work in Sweethaws is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
There’s a 12-month guarantee on every job.
- Place
- Sweethaws (TN6)
- Region
- East Sussex
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What we cannot put right
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Cracks in the bricks or render themselves, away from the joints
- Movement that’s more than a sealant joint can take
- Render that is blown, hollow or coming away
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think.
Surfaces we seal
- Concrete & block
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
Can I do it myself?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
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.
Sweethaws: your questions answered
Do you work for landlords with property near Crowborough station?
Yes. We work for landlords and letting agents as well as homeowners. You can phone 0345 464 0079 or email us with the details for a clear quote.
Do you cover smaller places like Sweethaws?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is it worth trying it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
What does external mastic cost?
It depends on the job, so we quote each one individually. To get one, phone 0345 464 0079 or send us an email and tell us what needs doing and where.
Can you quote for more than one area?
Yes. Just list everything you need.
What is backing rod for?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. That way it bonds to the two sides only and can stretch.
How the job changes by surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod in a colour to suit the brick.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. We cut out the old sealant and reseal with a product suited to both surfaces.
Places near Sweethaws
Also in Sweethaws
Landlord and commercial work in Sweethaws
For anyone letting property in or around Sweethaws, several properties can go on one quote. Send us the addresses and the work at each, and photos by email help.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
How it works
The work is kept neat and contained to the area we are working on, so you can carry on as normal. Expect the work to take anything from a few hours to several days, depending on the building, and we explain the cure time before we leave. For a village or hamlet like Sweethaws, the journey is planned in advance: 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.
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
- Plan for the work area to be out of bounds to pets and children
Get a quote
Every job is quoted individually, so start by telling us what you need. Simply phone 0345 464 0079 or send us an email and describe the job and send photos if you have them.
Read more
Why it’s worth doing now in Sweethaws
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. Where a wall is exposed, as many are in small places like Sweethaws, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
The cost reflects the work involved, not guesswork. That is why we ask about the job first.
Why Sweethaws clients choose us
- Experience in homes, commercial sites and hotels
- 12-month guarantee on every job
- Colour picked to suit the job
- Tidy, careful work
Take a look at how sealant jobs are priced and what customers say.
Sweethaws buildings and the weather
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Crowborough station, split movement joints are easy to miss on a rental until damp shows inside. If you look after a building such as Beacon Academy, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Sweethaws is about 2 miles south-west of Crowborough, in East Sussex. Whether you’re in the middle of Sweethaws or further out, external mastic is available for homes and businesses alike. 289 places in East Sussex are on our list, from the larger towns to small villages. Our Crawley page covers work nearby (15 miles or so).
Postcode districts we cover here for external mastic: TN6. Other places close to Sweethaws include High Hurstwood (1 mile south), Crowborough (2 miles north-east), Fairwarp (2 miles south-west), Jarvis Brook (2 miles north-east) and Marden's Hill (2 miles north). Larger places within reach include Lewes (12 miles south-west), Hailsham (13 miles south-east), Uckfield (5 miles south), South Malling (12 miles south-west), Heathfield (7 miles south-east) and Southover (13 miles south-west).
Local landmarks in Sweethaws
Around Sweethaws, our work takes us to homes and buildings near The Crow & Gate inn and the streets around them. Sweethaws’s nearest station is Crowborough station, roughly 2.2 miles east. Well-known places in the area include Tickerage Castle (4.6 miles south) and Crowborough War Memorial Hospital (1.3 miles north-east). For a walk, there’s Crowborough Country Park.