Essex · England
External Mastic in Netteswell
Sealing brickwork movement joints, render, cladding and façade joints for Netteswell, backed by a one-year guarantee. Call for a quick quote.
- Joints where the bead has come unstuck
- Panel joints letting water in
- Damp patches traced to an open external joint
Work for landlords, hotels and businesses
We also work for property managers and facilities teams in Netteswell and across Essex. We can quote a run of properties together.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can go on one quote.
External mastic for homes and businesses in Netteswell
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement. If you are dealing with movement joints with cracked, split or missing sealant and movement joints filled with mortar instead of sealant, we can put it right, on joints between brick and frames, concrete & block and façade panels alike.
In and around Netteswell, older properties sit alongside newer ones, each with its own outside joints. Older homes need their gutter and trim joints kept tight, newer ones their movement joints.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Location
- Netteswell (CM20, CM18, CM19)
- Region
- Essex
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What the job involves on each surface
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. We prime where the sealant needs it before the bead.
Cladding and façade panels
Panels heat up and cool down quickly, so the joints work hard every day. The sealant is chosen with that in mind.
FAQs for Netteswell
Do older homes in Netteswell need their sealant replacing?
In most cases, yes, if it hasn’t been done for a while. Sealant doesn’t last for ever, and its life depends on use, cleaning and weather, and many homes in Netteswell may already be on their second or third set.
Can you help a landlord with a rental near Harlow Town station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear price.
Is there a guarantee?
Yes, for a year. If there’s a problem with our work in that time, tell us and we’ll put it right.
Are you insured?
Yes. Mr Mastic is fully insured.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Can you reach joints on upper floors?
Each building is different. Send us photos and a rough idea of the height and we will confirm how they can be reached safely.
Can I add another job to the visit?
Yes, and it often makes sense. Doing several areas at once is generally more efficient.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
How it works
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes anything from a few hours to several days, depending on the building. Parking around Netteswell is generally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Move anything stored near the joints
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about earlier repairs to the joints
Getting a quote
We quote each job on its own, so the first step is telling us about yours. Just phone 0345 464 0079 or send us an email with the details and send photos if you have them.
Related advice
What affects the cost of external mastic
Your quote is based on your job. We take into account:
- How many areas need sealing
- Any working-time requirements on site
- The size of the job
- Whether the work is at height
What it costs depends on how much there is to do, how much old material has to come out and access to the work. We give a clear quote before any work starts.
Helping us quote
What to tell us when you ask for a quote:
- How we’d reach the joints
- Any previous sealing or DIY work
- Pictures of the joints, sent by email
- Whether it’s a home or a business
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
What external mastic looks like in Netteswell
Netteswell is part of Harlow, one of the post-war new towns. Many homes date from the post-war decades and were built in phases, so whole streets can have gutters, trims and wall joints reaching the end of their life together. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Harlow Town station, split movement joints are easy to miss on a rental until damp shows inside. In the older streets around St Andrew's Methodist Church, older walls, gutters and the joints where extensions meet them need a flexible sealant. Managing a site like Freshwaters Primary Academy? Then its movement joints, gutters and trims need looking after like any other building’s.
Netteswell is about 1 mile west of Harlow, in Essex. Whether you are in the middle of Netteswell or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Our Essex coverage runs to 644 places, and Netteswell is one of them. Chelmsford is on our list too, about 16 miles from Netteswell.
Here we cover the CM20, CM18 and CM19 postcode area for external mastic. If you need external mastic at a property on Park Lane, School Lane and Maddox Road or a nearby road, our applicators can take on the job. You will find Netteswell on the A1019, which makes it straightforward to reach. We also cover the places around Netteswell: Harlow (1 mile east), Mark Hall South (1 mile east), Mark Hall North (1 mile north-east), Latton (1 mile south-east) and Bush Fair (1 mile south). Within a short drive, we also cover Brentwood (13 miles south-east), Loughton (9 miles south), Waltham Abbey (7 miles south-west), Great Dunmow (13 miles north-east), Epping (5 miles south) and Stansted Mountfitchet (10 miles north-east).
Around Netteswell
Around Netteswell, our work takes us to homes and buildings near Brays Grove, BMAT STEM Academy and Garden Tiger pub, among other places. Netteswell’s nearest station is Harlow Town station, roughly 0.8 miles north-west of the centre. Well-known places in the area include Harlow Mill (1.6 miles north-east) and Princess Alexandra Hospital (0.8 miles west). For a walk, there’s Hunsdon Mead.
Should I try it myself first?
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.
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.
Towns and villages near Netteswell
What else we do in Netteswell
What sealant work can’t fix
In fairness, there are a few things sealant will not fix:
- Failed render or damaged cladding panels
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Adding movement joints to masonry that has none
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly before booking.
What we seal
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Façade panels
- Joints between brick and frames
- Copings & trims
Looking after it afterwards
After the cure time, these simple habits help:
- Check the sealant is paintable before painting near it
- Clear growth from the base of walls and joints
- Wash walls gently around the sealant
- Deal with leaking gutters that soak the joints below
Only paint over the joint if we have confirmed the sealant can take paint. Paint can crack on a flexible joint and spoil the finish.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Catch it early and you reduce the risk.