Hertfordshire · England
Cheshunt External Mastic
Problem with your movement joints in Cheshunt? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Water getting into walls through failed joints
- Joints where the bead has come unstuck
- Movement joints with cracked, split or missing sealant
The process
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes a few hours for a handful of joints, longer for a whole elevation, including the tidy-up. For a job in Cheshunt, we need access to where the work is and somewhere nearby to park. If the job is outside, mention gates, side access and anything above ground floor.
- First we look over the joints with you, agree which to renew and talk through access.
- 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.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- Move anything stored near the joints
- Mention any tricky access
Getting a quote
Every job is quoted individually, so start by telling us what you need. Just call 0345 464 0079 or drop us an email with the details.
Advice
About our external mastic in Cheshunt
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant all tend to fail early. We strip the joint back and start again. If you have panel joints letting water in and hard, crazed mastic that has stopped moving, we can put it right.
Plenty of homes in a town like Cheshunt have been extended, and the joint where new wall meets old is a classic place for water to get in. Sealing it properly means the right joint depth and a flexible sealant, not a quick bead.
A 12-month guarantee comes as standard, so you’re covered after we’ve gone.
- Where
- Cheshunt (EN7, EN8)
- Wider area
- Hertfordshire
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
For landlords and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will give you a quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.
Outside joints around Cheshunt
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Forty Hall (about 3 miles south) nearby, there’s older building stock in the area around Cheshunt as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
If you live in an older home near St Mary the Virgin, older walls, gutters and the joints where extensions meet them need a flexible sealant. For landlords with property near Cheshunt station, outside joints that have cracked can let damp into a rental, so check them between lets.
Cheshunt is about 14 miles north of City of Westminster, in Hertfordshire. Cheshunt gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Our Hertfordshire coverage runs to 381 places, Cheshunt among them. For nearby work, see our London page (15 miles or so).
Here we cover the EN7 and EN8 postcode area for external mastic. Whether your property is on Marlborough Square, High Street and Flamstead End Road or a nearby road, our applicators can take on the job. You will find Cheshunt on the A10 and B156, which makes it straightforward to reach. Nearby, we also carry out external mastic in Churchgate (1 mile south), Turnford (1 mile north-east), Goff's Oak (2 miles west), Wormley (2 miles north-east) and Wormley West End (2 miles north). Further out, we also cover Watford (15 miles west), Stevenage (15 miles north-west), St Albans (12 miles west), Bishop's Stortford (14 miles north-east), Welwyn Garden City (9 miles north-west) and Harpenden (15 miles north-west). Being one of Hertfordshire’s larger places, Cheshunt has homes, rented property and businesses of every kind.
Around Cheshunt
Typical jobs here are in homes near Goffs-Churchgate Academy, The Green Dragon Public House and Goffs School, among other places. Cheshunt’s nearest station is Cheshunt station, roughly 1.3 miles south-east of the centre. Other landmarks nearby include The National Speedway Museum (2.4 miles north) and St Michaels Hospital (3.7 miles south-west). The countryside around Cheshunt includes Lippitts Hill and Danemead.
Nearby places to Cheshunt
Also in Cheshunt
When something else is needed
New sealant cannot fix everything, and we will tell you before we start. Sealant will not put right:
- Damp that isn’t coming from the joint
- Structural movement, which needs a surveyor or engineer
- Loose or hollow render, which needs re-rendering
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before booking.
Where we work in Cheshunt
- Joints between brick and frames
- Façade panels
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
- Concrete & block
What we’re called out for in Cheshunt
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall.
The most common problems we see are:
- Weeds or debris growing in open joints
- Weathered mastic that no longer stretches
- Joints where the bead has come unstuck
- Failed seals between different materials
For site and facilities teams at buildings such as Andrews Lane Primary School, its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- Whether all the old sealant comes out first
- Which colour the sealant will be
- Whether the sealant suits the joint
- Is VAT in the price?
Aftercare tips
To keep the joints looking good and working properly:
- Get split or bare joints resealed while the damage is small
- Keep water from gutters off the wall
- Point out the joints to other trades
- Clear growth from the base of walls and joints
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed 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.
Different surfaces, different methods
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two.
Cladding and façade panels
Cladding and façade panels are normally separated by sealed joints. Each joint gets a sealant that suits the panel and its movement.
Cheshunt questions
What guarantee comes with external mastic in Cheshunt?
All our work, in Cheshunt and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Can you help a landlord with a rental near Cheshunt station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
Is it worth trying it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
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 the joint does not draw the eye.
Where are you based?
Our base is Crawley. Our area covers South East England, London and Scotland.
Does someone need to be in?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Do you work in Cheshunt?
Yes. We are based in Crawley and work across South East England, London and Scotland, and that includes Cheshunt.