Essex · England
Greenstead External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Greenstead and across Essex. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Cracked joints where brick meets render or frames
- Leaking joints around cladding and façade panels
- Water getting into walls through failed joints
External mastic for homes and businesses in Greenstead
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. We work on joints between brick and frames, render & cladding joints and concrete & block, and people most often call us about brick movement joints where the sealant has split and old sealant gone brittle and cracked.
Outbuildings, garages and conservatories around homes in places like Greenstead add more joints to look after. Gutter ends, garage door frames and the joints where an extension meets the house are typical spots for leaks.
You get a 12-month guarantee, the same in Greenstead as everywhere else we work.
- Where
- Greenstead (CO4, CO1, CO2)
- Wider area
- Essex
- Guarantee
- One year on every job
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost around the joint, so the problem grows beyond the joint itself. Around Greenstead, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
Leaving a failed joint normally makes the job bigger, not smaller. If you are not sure whether it needs doing, call 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Why book with us
- Approved under the ARBOMaster scheme
- A choice of colours where the product allows
- Quality sealants from Arbo and Everbuild
- Experience in homes, commercial sites and hotels
Take a look at our cost guide and our reviews.
What sealant work can’t fix
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Rising or penetrating damp from elsewhere in the wall
- Cracking across the wall rather than at a joint
- Movement that’s more than a sealant joint can take
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think before you book.
What we seal
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
- Concrete & block
How the visit works
Every visit runs the same way: we check the joints, protect the area around them, do the work and tidy away. Most jobs take a few hours to a few days, depending on the length of joint and the access. For a job in Greenstead, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- 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.
Getting ready for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Clear items away from the joints we are working on
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Read more
Also near Greenstead
Also in Greenstead
Greenstead questions
Is Greenstead within the area you cover?
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 Greenstead in your area for external mastic?
Yes, Greenstead is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
I rent my home. Can I book you?
We’re happy to deal with the tenant, landlord or agent. Just make sure your landlord agrees.
When is the sealant fully cured?
That depends on the sealant used, so please follow the time we give you.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Is there any odour?
Possibly a little. It fades as the sealant cures, and ventilation helps.
How do I get a quote for external mastic in Greenstead?
Size, access and the old material all affect the cost. Ask us for a quote and we’ll talk you through it.
Can you seal over the old sealant?
No, it will not last. It may look fine at first, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
When to call us in Greenstead
If plants are growing out of a joint, the sealant has normally failed or was never there. Dirt and roots then trap moisture in the joint.
The problems people generally mention when they call are:
- Movement joints with cracked, split or missing sealant
- Joints where the bead has come unstuck
- Old sealant gone brittle and cracked
- Rigid filler in a joint that should flex
For site and facilities teams at buildings such as Unity Primary Academy, its movement joints, gutters and trims need looking after like any other building’s.
Before you book anyone
- What product goes in the joint
- Whether they seal over old material or remove it
- What preparation is included
- How much experience the applicator has
What external mastic looks like in Greenstead
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Castle House (about 4.8 miles north-east) are a reminder that the area around Greenstead 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.
Rented homes near Hythe station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to Church of St Andrew include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Greenstead is about 2 miles east of Colchester, in Essex. Across the CO4 area, our applicators can take on external mastic. Greenstead is one of 644 places in Essex where we work. We also work in Chelmsford, about 22 miles from Greenstead.
We cover every part of the CO4, CO1 and CO2 postcode area for external mastic and the streets around it. Streets in the area include Tabor Road, Arrow Road and Forest Road, all of which we cover. Greenstead sits on or near the A137. We also cover The Hythe (1 mile south-west), Crockleford Heath (1 mile north-east), Old Heath (1 mile south), Wivenhoe Cross (2 miles south-east) and Elmstead (2 miles south-east). Within a short drive, we also cover Clacton-on-Sea (11 miles south-east), Witham (14 miles south-west), Harwich (14 miles east), Camulodunum (3 miles west), Halstead (13 miles west) and Heybridge (15 miles south-west).
Near you in Greenstead
We work in homes and buildings around Salary Brook Local Nature Reserve, Colchester Academy and The Rising Sun Public House, among other places. Greenstead’s nearest station is Hythe station, about 0.5 miles south-west of the centre. A little further out are Colchester Castle (1.5 miles west) and Grandad's Photography Museum (1.3 miles west). For a walk, there’s Cockaynes Wood.
Landlord and commercial work in Greenstead
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
For anyone letting property in or around Greenstead, several properties can go on one quote. Send us the addresses and the work at each.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Wash walls gently around the sealant
- Deal with leaking gutters that soak the joints below
- Point out the joints to other trades
- Don’t let climbing plants root in the sealant
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Resealing it early helps prevent that.