East Sussex · England
External Mastic in Upper Hartfield
Sealing brickwork movement joints, render, cladding and façade joints for Upper Hartfield, backed by a one-year guarantee. Call for a quick quote.
- Leaking joints around cladding and façade panels
- Sealant pulling away from one side of the joint
- Gaps where render, brick and frames meet
Questions from Upper Hartfield
Do you cover Upper Hartfield for external mastic?
Yes, Upper Hartfield is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
I let a flat near Ashurst Kent station. Can you help?
Yes, rental work is part of what we do. Just call 0345 464 0079 or drop us an email and tell us about the property, and we will send you a clear quote.
Will there be a smell?
There can be a smell while the sealant cures. Opening a window helps.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
What is a movement joint?
Walls move with heat, cold and moisture, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
What do you need from me for a quote?
Let us know what needs doing and where, plus pictures if you have them. If we need more, we will ask.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
About our external mastic in Upper Hartfield
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. Typical jobs include movement joints filled with mortar instead of sealant and joints where the bead has come unstuck, on joints between brick and frames, concrete & block and copings & trims.
Somewhere as small as Upper Hartfield, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
The work is covered for a year after we finish. If there’s a problem with it, please phone 0345 464 0079 or email us.
- Where
- Upper Hartfield (TN7)
- Region
- East Sussex
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How it works
You do not need to clear the whole room or building before we come, just the space around the work. We protect the rest, and the work takes a few hours for a handful of joints, longer for a whole elevation for a typical job. Somewhere as small as Upper Hartfield, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Let us know if you’ve seen damp or leaks
- Mention any sign-in or site rules at work premises
- Keep pets and children clear of the area while we work
Get a quote
We quote each job on its own, so the first step is telling us about yours. Simply phone 0345 464 0079 or send us an email and describe the job, and pictures are welcome.
Related advice
How the job changes by surface
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. Where one has been mortared, we cut it out and reseal it with sealant.
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
What affects the quote in Upper Hartfield
We don’t publish a price list, because jobs vary so much. The quote depends on:
- Mould in or behind the old joints
- How easy the joints are to reach
- The product the joint needs
- Working hours on commercial sites
A failed joint rarely gets cheaper to fix by waiting. If you’re not sure whether it needs doing, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- Pictures of the joints, sent by email
- The rough size of the job
- Where the property is
- Access, such as stairs, a lift or height
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Looking after it afterwards
Good habits help new joints last longer. Our tips:
- Keep soil, plants and ivy away from the joints
- Check the sealant is paintable before painting near it
- Tell anyone working on the walls about the movement joints
- Avoid pressure-washing directly into sealant joints
Keep pressure washers away from the sealant. High-pressure water can lift the edges and let water in behind.
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.
Towns and villages near Upper Hartfield
What else we do in Upper Hartfield
When to call us in Upper Hartfield
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The new sealant then lets go long before it should.
Look out for any of the following:
- Weathered mastic that no longer stretches
- Joints where the bead has come unstuck
- Cracked joints where brick meets render or frames
- Rain getting behind render or cladding at a joint
For an older house near a landmark such as Holy Trinity Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
What to look for in a quote
- How hidden problems are handled
- What the quote includes, VAT included or not
- What insurance they hold
- How long to leave it before use
Outside joints around Upper Hartfield
Historic houses like Bassetts Manor (about 1.9 miles north) are a reminder that the area around Upper Hartfield has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Ashurst Kent station, outside joints that have cracked can let damp into a rental, so check them between lets.
Upper Hartfield is about 5 miles north-west of Crowborough, in East Sussex. Whether you’re in the middle of Upper Hartfield or further out, external mastic is available for homes and businesses alike. Upper Hartfield is one of 289 places in East Sussex we cover for external mastic. We also work in Crawley, around 12 miles away.
Our applicators cover all of the TN7 postcode area for external mastic and the streets around it. You will find streets such as Parrock Lane, Cat Street and Gallipot Hill, and we cover them all. We also cover Coleman's Hatch (1 mile south-west), Forest Row (2 miles west), Wych Cross (3 miles south-west), Duddleswell (4 miles south) and Chelwood Gate (4 miles south-west). Further out, we also cover Lewes (15 miles south), Crowborough (5 miles south-east), Uckfield (9 miles south), South Malling (15 miles south), Heathfield (11 miles south-east) and Cliffe (15 miles south).
What’s near Upper Hartfield
Upper Hartfield’s nearest station is Ashurst Kent station, about 3.7 miles north-east. A little further out are Bolebroke Castle (2 miles north-east) and Crowborough War Memorial Hospital (4.2 miles south-east).
Why it’s worth doing now in Upper Hartfield
Running new sealant over the old bead rarely lasts. The new layer can’t bond properly to old, weathered material, so we always take the old sealant out. Where a wall is exposed, as many are in small places like Upper Hartfield, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
Why Upper Hartfield clients choose us
- Rated 4.9 stars on Google
- Over 20 years’ experience
- A choice of colours where the product allows
- Neat joints and a tidy finish
Take a look at how sealant jobs are priced and customer reviews.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
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.