Essex · England
External Mastic in Newhall
External mastic in Newhall from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rigid filler in a joint that should flex
- Joints with sealant missing in places
- Gaps where render, brick and frames meet
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Look over the joints every year, ideally after winter
- Keep movement joints as flexible joints, not mortar
- Act on the first splits you see
- Fix overflowing gutters above sealed joints
Do not let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years, so it’s worth resealing at the first signs.
About our external mastic in Newhall
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. The colour is chosen to suit the brick or render so the line blends in. We are often asked to deal with weeds or debris growing in open joints and sealant that has lost its bond to the brick or render, on joints between brick and frames, façade panels and render & cladding joints.
Around Newhall, garages, outbuildings and extensions all add to the joints on the outside of a home. Gutter ends, garage door frames and the joints where an extension meets the house are typical spots for leaks.
There’s a 12-month guarantee on every job, large or small.
- Location
- Newhall (CM17, CM20)
- Region
- Essex
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Your questions about external mastic in Newhall
Do you cover smaller places like Newhall?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can you help a landlord with a rental near Harlow Mill station?
Yes, we work for landlords and agents. Just call 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status, and we’re fully insured.
Can you seal over the old sealant?
No, and we never do. It may look fine at first, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Can a movement joint be filled with mortar?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. We’ll reseal it with a flexible sealant.
Is there any odour?
Possibly a little. Any smell clears as the sealant cures.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us and we’re fully insured.
Do you work at height?
It depends on the building. Where joints can be reached safely, we will do them. Give us some details and we will confirm the access.
What the job involves on each surface
Render joints
Render has movement joints and stop beads that need sealing. They’re resealed in a sealant that suits the render.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
External mastic in Newhall: local notes
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Harlow, which Newhall is part of, is one of England’s post-war new towns. Homes here were built in phases, many of them in the post-war decades, so whole streets can have gutters, trims and wall joints reaching the end of their life together.
For an older house near a landmark such as Church of St Mary the Virgin, older walls, gutters and the joints where extensions meet them need a flexible sealant. For landlords with property near Harlow Mill station, outside joints that have cracked can let damp into a rental, so check them between lets.
Newhall is about 1 mile east of Harlow, in Essex. Whether you are in the middle of Newhall or further out, external mastic is available for homes and businesses alike. Across Essex, we cover 644 places, Newhall among them. Our Chelmsford page covers work nearby, about 15 miles away.
We work across CM17 and CM20 for external mastic and the streets around it. If you need external mastic at a property on Moss Lane, Petal Lane and Robin Lane or a nearby road, our applicators can take on the job. With the A414 and A1025 close by, Newhall is simple for us to get to. Nearby, we also carry out external mastic in Latton (1 mile south-west), Mark Hall South (1 mile west), Harlow (1 mile west), Mark Hall North (1 mile north-west) and Foster Street (1 mile south-east). We also work in nearby towns such as Chelmsford (15 miles east), Brentwood (12 miles south-east), Loughton (9 miles south), Waltham Abbey (8 miles south-west), Great Dunmow (12 miles north-east) and Epping (5 miles south).
What’s near Newhall
We work in homes and buildings around Mark Hall School, The Small Copper pub and Gibberd Garden and the streets around them. Newhall’s nearest station is Harlow Mill station, about 1.3 miles north of the centre. Nearby you’ll also find Mark Hall Cycle Museum (0.7 miles north-west) and Princess Alexandra Hospital (2.1 miles west). Green spaces nearby include Hunsdon Mead.
Places near Newhall
More services for Newhall
What happens if it’s left?
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. In an older home around Newhall, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What you get with us
- Approved under the ARBOMaster scheme
- Trusted Arbo and Everbuild sealants
- Old sealant always removed completely
- Colour picked to suit the job
See what affects the cost or our reviews.
Landlord and commercial work in Newhall
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will give you a quote.
We work for letting agents and landlords as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
What affects the quote in Newhall
There’s no set price list. The quote depends on:
- The old material and how stubborn it is
- How many rooms, windows or areas are involved
- Any working-time requirements on site
- Which sealant suits the joint
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
What we need to know
To help us quote quickly, please include:
- Whether it’s a home or a business
- Any previous sealing or DIY work
- Any access issues, like height or stairs
- The rough size of the job
We don’t publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or drop us an email.
The process
The work is kept neat and contained to the area we’re working on, so you can carry on as normal. Expect the work to take anything from a few hours to several days, depending on the building. For a job in Newhall, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Let us know about parking restrictions
- Keep pets and children clear of the area while we work
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we will explain what’s involved and give you a clear price.
Advice
Do you need external mastic in Newhall?
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall and speed up the damage.
Any of these means the joints need attention:
- Brick movement joints where the sealant has split
- Water getting into walls through failed joints
- Weathered mastic that no longer stretches
- Rigid filler in a joint that should flex
For site and facilities teams at buildings such as Newhall Primary Academy, its movement joints, gutters and trims need looking after like any other building’s.
What to look for in a quote
- How the surfaces are prepared before sealing
- Whether you can choose the colour
- How long to leave it before use
- What insurance they hold