East Sussex · England
Hartfield External Mastic
We cover Hartfield for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Joints pointed up with cement by mistake
- Leaking joints around cladding and façade panels
- Plants rooting in failed movement joints
External mastic in Hartfield, 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. We pick a colour that sits well with the wall so the joint doesn’t stand out. If you have water getting into walls through failed joints and failed seals between different materials, we can put it right, whatever the surface.
In a village or hamlet like Hartfield, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
You are covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or email us.
- Place
- Hartfield (TN7)
- Region
- East Sussex
- Guarantee
- One year on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
If you manage several properties in or around Hartfield, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
Also near Hartfield
What else we do in Hartfield
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Looking after it afterwards
Aftercare is simple:
- Keep water from gutters off the wall
- Act on the first splits you see
- Keep soil, plants and ivy away from the joints
- Leave the joints unpainted unless we’ve said otherwise
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.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Common questions in Hartfield
Do you work for landlords with property near Ashurst Kent station?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Do you cover smaller places like Hartfield?
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.
Do you seal joints where cladding meets other materials?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. The colour is chosen to suit.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we’re fully insured.
Do you have insurance?
Yes. We’re fully insured.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Do I have to be there?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Is there a guarantee?
Yes. All our work carries a 12-month guarantee.
What happens on the day
We keep the work tidy and contained to the area we’re working on, so you can get on with your day. The job usually takes a few hours for a handful of joints, longer for a whole elevation, and we tell you how long to leave it before we go. For a village or hamlet like Hartfield, 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.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Keep children and pets away from the work area
- Mention any tricky access
- Mention any sign-in or site rules at work premises
Getting a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Read more
What sealant work can’t fix
To be straight with you, there are a few things sealant won’t fix:
- Structural movement, which needs a surveyor or engineer
- Adding movement joints to masonry that has none
- Loose or hollow render, which needs re-rendering
If in doubt, call 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Façade panels
- Joints between brick and frames
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Copings & trims
Outside joints around Hartfield
Historic houses like Bassetts Manor (about 1.5 miles north-west) are a reminder that the area around Hartfield has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to The Parish Church of St Mary include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. Rented homes near Ashurst Kent station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
Hartfield is about 4 miles north-west of Crowborough, in East Sussex. Every kind of property in Hartfield is covered for external mastic. Every job comes with our one-year guarantee. Hartfield is one of 289 places in East Sussex where we work for external mastic. You can also see our page for Crawley, about 13 miles away.
Jobs for external mastic in TN7 is quoted and booked the same way as anywhere else. Streets in the area include High Street, Church Street and Rectory Field, all of which we cover. We also cover the places around Hartfield: Balls Green (1 mile east), Teasley Mead (3 miles north-east), Ashurst (3 miles north-east), Groombridge (3 miles east) and Stone Cross (3 miles north-east). Larger places within reach include Crowborough (4 miles south-east), Uckfield (9 miles south), Heathfield (11 miles south-east), Wadhurst (10 miles east), Ridgewood (10 miles south) and Ringmer (15 miles south).
Near you in Hartfield
In Hartfield, that means homes and buildings near The Anchor Inn. The closest station to Hartfield is Ashurst Kent station, about 2.6 miles north-east of the centre. A little further out are Crowborough War Memorial Hospital (4 miles south-east) and Bolebroke Castle (1.3 miles north). Open spaces near Hartfield include Broadwater Warren RSPB Reserve.
Different surfaces, different methods
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. Each is resealed with a weatherproof, flexible sealant.
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two so the movement is taken up.
When to call us in Hartfield
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
It’s worth asking for a quote if you see:
- Weathered mastic that no longer stretches
- Plants rooting in failed movement joints
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
For site and facilities teams at buildings such as St Mary the Virgin Church of England Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before you book
- What preparation is included
- How long to leave it before use
- How much experience the applicator has
- Whether the sealant suits the joint