Greater London · England
External & façade joints in Hornchurch, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Hornchurch and across Greater London. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Brick movement joints where the sealant has split
- Movement joints filled with mortar instead of sealant
- Gaps where render, brick and frames meet
What affects the quote in Hornchurch
There’s no set price list. The quote depends on:
- The product the joint needs
- The number and length of the joints
- How much old sealant there is and how hard it is to remove
- Whether there’s mould to deal with
Combining jobs into one visit is normally more efficient than separate visits. You’ll get one clear quote for the whole job.
What to tell us for a quote
Photos help, but a description is a good start. Try to tell us:
- Whether it has been sealed before
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
- Access, such as stairs, a lift or height
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or send us an email.
About our external mastic in Hornchurch
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing and we use one wherever it does. We work on joints between brick and frames, copings & trims and façade panels, and people most often call us about failed seals between different materials and moss and dirt in joints with no sealant left.
Outside work in London starts with access: side passages, upper floors and where to park. In Hornchurch, joints up high may need ladders or other access, which is worth talking through when you book.
Whatever the size of the job, you get the same 12-month guarantee in Hornchurch and across Greater London.
- Place
- Hornchurch (RM12, RM11, RM14, RM1)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Should I try it myself first?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
A DIY attempt does not rule out a professional job. We cut it out and start again.
Keeping the joints in good condition
Aftercare is simple:
- Never let anyone fill a movement joint with mortar
- Ask before painting over external sealant
- Keep high-pressure jets off the joints
- Point out the joints to other trades
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
Act while the splits are small. Then it’s a straightforward cut-out and reseal.
What we do, step by step
Good joint work is mostly preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours to a few days, depending on the length of joint and the access. For a job in Hornchurch, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
- Keep children and pets away from the work area
Getting a quote
Want a quote for external mastic? Please call 0345 464 0079 or drop us an email with a few details. We’ll explain what we’d do and send you a clear quote before we start.
Related advice
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report. Several properties can be quoted together.
If you manage several properties in or around Hornchurch, several properties can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
Questions from Hornchurch
Can you help a landlord with a rental near Emerson Park station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Do you cover Hornchurch for external mastic?
Yes. We work across London and the South East, and Hornchurch is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing.
Can you do several jobs on one visit?
Yes. Just list everything you need and you will get one quote.
Why is there a gap in my brick wall?
A vertical gap in a long brick wall is normally a movement joint. It lets the bricks expand without cracking, and it should be sealed with a flexible sealant.
Is there any odour?
There can be a smell while the sealant cures, but it fades. Opening a window helps.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Should I point up the gap in my brickwork?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.
What information do you need?
Just the basics: where it is, what you’ve noticed and how we reach it. After that, simply phone 0345 464 0079 or email us.
How the job changes by surface
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. Backing rod sized to the joint sets it and keep the sealant to the right depth.
Common problems we fix in Hornchurch
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it cannot stretch and rips as the joint opens.
Most people get in touch after spotting one of these:
- Weeds or debris growing in open joints
- Joints pointed up with cement by mistake
- Gaps where render, brick and frames meet
- Brick movement joints where the sealant has split
In the older streets around Saint George's Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What your quote should include
- What happens if the job turns out different
- How much experience the applicator has
- What the cure time is
- Whether they seal over old material or remove it
Also near Hornchurch
Other services in Hornchurch
Hornchurch buildings and the weather
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. Historic houses like Hare Hall (about 1.8 miles north) are a reminder that the area around Hornchurch 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.
As a London address, Hornchurch can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. If you let a flat or house near Emerson Park station, outside joints that have cracked can let damp into a rental, so check them between lets.
Hornchurch is about 6 miles south-west of Brentwood, in Greater London. Across the RM12 area, our applicators can take on external mastic. Our area takes in 764 places across Greater London, large and small. There’s also a page for London, about 14 miles away.
Postcode districts we cover here for external mastic: RM12, RM11, RM14 and RM1. Whether your property is on High Street, The Avenue and Stanley Road or a nearby road, we can help. Main roads around Hornchurch include the A125. Other places close to Hornchurch include Upminster Bridge (1 mile east), Heath Park (1 mile north-west), Emerson Park (1 mile north-east), Hacton (2 miles south) and Ardleigh Green (2 miles north). Larger places within reach include London (14 miles west), St Pancras (14 miles west), Shoreditch (13 miles west), Walthamstow (10 miles west), Hoxton (13 miles west) and Whitechapel (13 miles west).
What’s near Hornchurch
We work in homes and buildings around Abbs Cross Academy and Arts College, J.J. Moon's pub and St. Andrew's Park. For rail, the closest station is Emerson Park station, roughly 0.7 miles north of the centre. Nearby you’ll also find Upminster Tithe Barn Museum of Nostalgia (1.9 miles east) and The Brewery (1.8 miles north-west). For a walk, there’s Hornchurch Cutting.