Essex · England
Greensted Green External Mastic
External mastic in Greensted Green from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Failed sealant between panels on a façade
- Plants rooting in failed movement joints
- Failed seals between different materials
How the job changes by surface
Render joints
Render has movement joints and stop beads that need sealing. We reseal them with a flexible exterior sealant that suits the render colour.
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best year round.
About our external mastic in Greensted Green
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. If you have panel joints letting water in and gaps where render, brick and frames meet, we can put it right, whatever the surface.
Outside joints can only be sealed when they’re dry, so work in Greensted Green is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
Every job comes with a one-year guarantee, wherever you are in Essex.
- Location
- Greensted Green (CM5)
- Wider area
- Essex
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Towns and villages near Greensted Green
More services for Greensted Green
How the visit works
On the day, there’s very little for you to do. Show us the job and we will take it from there. The job generally takes anything from a few hours to several days, depending on the building. For a village or hamlet like Greensted Green, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Mention any tricky access
- Clear items away from the joints we are working on
- Mention if the joints have been sealed before
Ask for a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Read more
Greensted Green questions
Is there a guarantee on external mastic in Greensted Green?
Every job comes with our 12-month guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Will you come out to Greensted Green?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few photos.
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.
What does external mastic cost?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You will get a clear quote before any work starts.
Can you seal over the old sealant?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. We remove it all first.
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.
Do you use backing rod?
We fit closed-cell backing rod wherever the joint depth needs controlling. It sets the sealant depth and prevents three-sided bonding, so the joint can move.
Signs you need external mastic in Greensted Green
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.
Any of these means the joints need attention:
- Plants rooting in failed movement joints
- Hard, crazed mastic that has stopped moving
- Joints pointed up with cement by mistake
- Leaking joints around cladding and façade panels
For an older house near a landmark such as Greensted Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Questions to ask before booking
- How long to leave it before use
- How much experience the applicator has
- Whether they seal over old material or remove it
- Which colour the sealant will be
Why deal with it now?
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render, so the damage spreads beyond the joint. Where a wall is exposed, as many are in small places like Greensted Green, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Why Greensted Green customers choose us
- Approved under the ARBOMaster scheme
- Tidy, careful work
- You choose the colour before work begins
- White, clear, grey or another colour, product permitting
Read what affects the cost or customer reviews.
How we quote for external mastic
The price is agreed before any work begins. It takes into account:
- How many rooms, windows or areas are involved
- The product the joint needs
- Any working-time requirements on site
- How easy the joints are to reach
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Helping us quote
To make quoting easier, please include:
- Any previous sealing or DIY work
- Where the property is
- How many joints, rooms or windows are involved
- Access, such as stairs, a lift or height
For a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Ask before painting over external sealant
- Point out the joints to other trades
- Keep high-pressure jets off the joints
- Keep movement joints as flexible joints, not mortar
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
Small splits are the time to act. At that stage it’s a simple cut out and reseal with no damage behind it to deal with.
What external mastic looks like in Greensted Green
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. Historic houses like Hill Hall (about 3.2 miles south-west) are a reminder that the area around Greensted Green 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.
Managing a site like The Ongar Academy? Then its movement joints, gutters and trims need looking after like any other building’s.
Greensted Green is about 6 miles south-east of Harlow, in Essex. From the centre of Greensted Green to the outskirts, we cover external mastic for every kind of property. We cover 644 towns and villages across Essex, from the larger towns to small villages. Chelmsford is on our list too, around 12 miles away.
Postcode districts we cover here for external mastic: CM5. That includes homes and businesses on Greensted Road and Toot Hill Road and the roads around them. Neighbouring places we cover for external mastic include Greensted (1 mile east), Bovinger (1 mile north), Shelley (2 miles east), Chipping Ongar (2 miles east) and Bobbingworth (2 miles north). We also work in nearby towns such as Chelmsford (12 miles east), Basildon (14 miles south-east), Harlow (6 miles north-west), Brentwood (7 miles south-east), Billericay (11 miles south-east) and Loughton (7 miles south-west).
Around Greensted Green
Around Greensted Green, our work takes us to homes and buildings near The Green Man pub and Weald Common Flood Meadows. A little further out are St. Margaret's Hospital (3.5 miles west). Open spaces near Greensted Green include Gernon Bushes.
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.