Essex · England
External Mastic in Roundbush Green
External mastic for Roundbush Green and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Moss and dirt in joints with no sealant left
- Rain getting behind render or cladding at a joint
- Hard, crazed mastic that has stopped moving
How we quote for external mastic
We don’t publish a price list. What we look at:
- Which sealant suits the joint
- When we can work, for business premises
- Whether there’s mould to deal with
- How easy the joints are to reach
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Helping us quote
You do not need to know the technical terms. It helps if you can tell us:
- A few pictures by email, if you can
- How we’d reach the joints
- Where the job is, and your postcode
- What’s wrong with the joints now
Want a quote for external mastic? Please ring 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
About our external mastic in Roundbush Green
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. If you’re dealing with water getting into walls through failed joints and failed sealant between panels on a façade, we can put it right, on brickwork movement joints, joints between brick and frames and façade panels alike.
Older homes in small places like Roundbush Green may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water normally gets in, and they need the right sealant at the right depth.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Where
- Roundbush Green (CM6)
- Region
- Essex
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How the job changes by surface
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that’s happened, we rake it out and reseal it properly if the joint can be cleared.
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.
What happens on the day
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes anything from a few hours to several days, depending on the building from start to finish. For a village or hamlet like Roundbush Green, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- Old sealant and any debris are cut and raked out.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Let us know about earlier repairs to the joints
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, call 0345 464 0079 or send us an email.
Advice
Honest limits
A few problems are outside what sealant work can do:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Movement that’s more than a sealant joint can take
- Failed render or damaged cladding panels
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Façade panels
Should I try it myself first?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Questions from Roundbush Green
Will you come out to Roundbush Green?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
What guarantee comes with external mastic in Roundbush Green?
All our work, in Roundbush Green and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
What colours does the sealant come in?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We choose the closest to your brick or render so it doesn’t stand out.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Are you fully insured?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
Do you seal joints where cladding meets other materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Nearby places to Roundbush Green
More services for Roundbush Green
Leave it or put it right?
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. Older cottages and farmhouses around Roundbush Green can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins.
What you get with us
- Colour agreed with you before we start
- A sealant colour to suit the surroundings
- Old sealant always removed completely
- 180+ five-star Google reviews
Read our cost guide or customer reviews.
Aftercare tips
To keep the joints looking good and working properly:
- Tell anyone working on the walls about the movement joints
- Deal with leaking gutters that soak the joints below
- Make sure movement joints aren’t pointed over
- Check external joints each spring
Don’t paint over the new sealant unless we have said the product is paintable. Many exterior sealants are not designed to be painted, and paint can crack as the joint moves.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Resealing it early helps prevent that.
External mastic in Roundbush Green: local notes
Historic houses like Barrington Hall (about 3.1 miles north-west) are a reminder that the area around Roundbush Green has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Parish Church of St Mary, older walls, gutters and the joints where extensions meet them need a flexible sealant. For site and facilities teams at buildings such as Rodings Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Roundbush Green is about 8 miles south-east of Bishop's Stortford, in Essex. Jobs in Roundbush Green get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. 644 places in Essex are on our list, large and small. For nearby work, see our Chelmsford page (9 miles or so).
Postcode districts we cover here for external mastic: CM6. If you need external mastic at a property on Dunmow Road and Drury Lane or anywhere close by, our applicators can take on the job. Other places close to Roundbush Green include Keeres Green (1 mile south), Great Canfield (2 miles north), High Roding (2 miles north-east), High Easter (2 miles east) and Stagden Cross (3 miles east). We also work in nearby towns such as Chelmsford (9 miles south-east), Braintree (12 miles north-east), Harlow (9 miles west), Brentwood (13 miles south), Billericay (14 miles south) and Witham (14 miles east).
What’s near Roundbush Green
We work in homes and buildings around Axe And Compasses Public House. Other landmarks nearby include Willingale Doe (4.2 miles south). For a walk, there’s Portingbury Hills.