Essex · England
Crow Green External Mastic
Our applicators work in Crow Green on sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and a one-year guarantee.
- Failed seals between different materials
- Sealant that has lost its bond to the brick or render
- Weeds or debris growing in open joints
External mastic for homes and businesses in Crow Green
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the joint doesn’t stand out. We work on render & cladding joints, joints between brick and frames and façade panels, and people most often call us about leaking joints around cladding and façade panels and movement joints with cracked, split or missing sealant.
Around Crow 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.
All our work is covered by a one-year guarantee, wherever you are in Essex.
- Place
- Crow Green (CM15)
- Wider area
- Essex
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Walls and rooflines in Crow Green
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Ingatestone Hall (about 4.4 miles east) are a reminder that the area around Crow Green has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
If you look after a building such as Larchwood Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. In the older streets around Trinity Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Crow Green is about 2 miles north of Brentwood, in Essex. We carry out external mastic for homes and businesses in Crow Green and the surrounding area. Our Essex coverage runs to 644 places, and Crow Green is one of them. There’s also a page for Chelmsford, about 10 miles away.
Every address in CM15 is within our area for external mastic. We also cover Pilgrims Hatch (1 mile south), Doddinghurst Common (1 mile north-west), Bentley (1 mile west), Kelvedon Hatch (1 mile north-west) and Coxtie Green (1 mile west). We also work in nearby towns such as Chelmsford (10 miles north-east), Basildon (9 miles south-east), Harlow (11 miles north-west), Canvey Island (15 miles south-east), Billericay (6 miles east) and Rayleigh (14 miles east).
Around Crow Green
Locally, jobs take us to homes and businesses close to Becket Keys Church of England School, Sawyers Hall College and Weald Country Park and the streets around them. The nearest railway station is Shenfield station, roughly 2.1 miles south-east. Other landmarks nearby include Brentwood Community Hospital (1.9 miles south-east). Green spaces nearby include Thorndon Park.
Places near Crow Green
What else we do in Crow Green
How we quote for external mastic
Your quote is based on your job. We look at:
- How many rooms, windows or areas are involved
- Any mould that needs treating
- The size of the job
- Working hours on commercial sites
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. We take all of that into account in your quote.
Helping us quote
What to tell us when you ask for a quote:
- Any previous sealing or DIY work
- Roughly how big the job is
- What the problem is, such as mould, gaps, leaks or cracking
- Pictures of the joints, sent by email
We don’t publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or email us.
Common questions in Crow Green
Do you cover Crow Green for external mastic?
Yes, Crow Green is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing, and we’ll send you a clear quote.
Will you come out to Crow Green?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
What’s an expansion joint in brickwork?
It’s a deliberate gap that lets the wall expand and contract without cracking. It’s sealed with a flexible sealant, not mortar.
Can you quote for more than one area?
Of course. Doing several areas at once is generally more efficient, so mention them when you ask for a quote.
Can you seal joints between render and window frames?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. The colour is chosen to suit.
Can you match the colour of my brickwork?
The sealant colour is picked to suit the wall, so the joint sits quietly in the wall. There’s a wide choice of exterior colours.
Can new sealant go over the old?
No, it will not last. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Where do you work from?
We’re based in Crawley, and we work across South East England, London and Scotland.
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Tell anyone working on the walls about the movement joints
- Wash walls gently around the sealant
- Keep water from gutters off the wall
- Check external joints each spring
Only paint over the joint if we have confirmed the sealant can take paint. Many exterior sealants aren’t designed to be painted and spoil the finish.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
Should I try it myself first?
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Why deal with it now?
Water gets in through a failed movement joint and can run behind render or cladding. Resealing early keeps the job to the joint itself, rather than the wall around it. Older cottages and farmhouses around Crow Green can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in Crow Green
- White, clear, grey or coloured to suit, where the product allows
- ARBOMaster approved applicator
- Arbo and Everbuild products
- Tidy, careful work
Take a look at our cost guide and customer reviews.
What happens on the day
Most of a good job is in the preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. In total, it usually takes anything from a few hours to several days, depending on the building. Somewhere like Crow Green needs a little journey planning: 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 we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Move anything stored near the joints
- Try not to wet indoor joints just before the visit
- On commercial sites, let us know about site rules
Get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that’s easy.
Advice
For landlords and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we are fully insured for the work.
Do you need external mastic in Crow Green?
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it can’t stretch and tears as soon as the joint widens.
Common reasons people contact us are:
- Weeds or debris growing in open joints
- Movement joints filled with mortar instead of sealant
- Joints where the bead has come unstuck
- Failed sealant between panels on a façade
If you let a flat or house near Shenfield station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What to look for in a quote
- How long the guarantee is
- Who does the work, and how experienced they are
- How hidden problems are handled
- Whether VAT is included