East Sussex · England
External Mastic in Lions Green
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Lions Green and across East Sussex. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Weathered mastic that no longer stretches
- Water getting into walls through failed joints
- Moss and dirt in joints with no sealant left
Your questions about external mastic in Lions Green
What guarantee comes with external mastic in Lions Green?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Can you do external mastic in Lions Green?
Yes, Lions Green is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
How long does external mastic last?
That depends on the wall, the weather and the movement. Look for splits, hardening or edges coming away.
I’m a tenant. Can you help?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Is it OK to fill a movement joint with cement?
No. A mortar-filled joint can’t move, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
External mastic for homes and businesses in Lions Green
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it, and we do not skip that step. If you’re dealing with joints with sealant missing in places and damp patches traced to an open external joint, we can help, on concrete & block, joints between brick and frames and façade panels alike.
Around Lions Green, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water usually gets in, and they need the right sealant at the right depth.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- Lions Green (TN21)
- Wider area
- East Sussex
- Cover
- 12 months on all our work
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Can I do it myself?
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.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Looking after it afterwards
After the cure time, these simple habits help:
- Leave the joints unpainted unless we have said otherwise
- Act on the first splits you see
- Avoid pressure-washing directly into sealant joints
- Deal with leaking gutters that soak the joints below
Follow the cure time we give you before the joint is knocked or disturbed. Most exterior sealants skin fast but take longer to cure right through.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Catch it early and you reduce the risk.
What sealant work can’t fix
A few problems are outside what sealant work can do:
- Movement that’s more than a sealant joint can take
- Damp that is not coming from the joint
- Loose or hollow render, which needs re-rendering
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Joints and surfaces we work on
- Copings & trims
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
- Façade panels
Different surfaces, different methods
Render joints
Cracks along render joints let water in behind the coat. A sound joint keeps the render dry behind.
Copings and trims
A failed coping joint lets water into the top of the wall. Resealing them is a small job that protects a lot.
What we are called out for in Lions Green
Some movement joints have been pointed up with mortar by mistake. The joint can’t move, so the wall cracks somewhere else instead.
The problems people usually mention when they call are:
- Movement joints with cracked, split or missing sealant
- Joints pointed up with cement by mistake
- Weeds or debris growing in open joints
- Failed seals between different materials
In and around Lions Green, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
What to look for in a quote
- What the cure time is
- Whether you can choose the colour
- Who turns up on the day
- Whether VAT is included
What happens on the day
There isn’t much for you to do on the day. Show us the job and we’ll take it from there. The job generally takes anything from a few hours to several days, depending on the building. In a small place like Lions Green, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
- Tell us about any previous sealing or DIY attempts
How to get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or send us an email.
Advice
External mastic in Lions Green: local notes
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Horselunges Manor (about 4 miles south) are a reminder that the area around Lions Green 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.
In the older streets around The Parish Church of All Saints, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Lions Green is about 5 miles east of Uckfield, in East Sussex. From the centre of Lions Green to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Across East Sussex, we cover 289 places, Lions Green among them. Our Brighton page covers work nearby.
Every address in TN21 is covered for external mastic. If you’re just outside Lions Green, we cover Waldron (1 mile north-west), Burlow (1 mile south-east), Horam (1 mile south-east), Maynard's Green (2 miles east) and Roser's Cross (2 miles north). Within a short drive, we also cover Eastbourne (11 miles south), Bexhill-on-Sea (13 miles south-east), Seaford (12 miles south), Lewes (10 miles south-west), Hailsham (6 miles south) and Crowborough (8 miles north).
Local landmarks in Lions Green
In Lions Green, that means homes and buildings near The Star Inn, among other places. Well-known places in the area include Tickerage Castle (3.6 miles north-west) and Sussex Farm Museum (1.2 miles east). Green spaces nearby include Selwyns Wood.
Also near Lions Green
Other services in Lions Green
Quotes for external mastic in Lions Green
Some jobs are bigger than they look, and some smaller. What affects the quote:
- When we can work, for business premises
- The number and length of the joints
- Any mould that needs treating
- Which sealant suits the joint
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- The type of property
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
- Photos by email, if that is easy
For external mastic in Lions Green, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.