Greater London · England
External & façade joints in South Hornchurch, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for South Hornchurch, backed by a 12-month guarantee. Ask us for a quote.
- Damp patches traced to an open external joint
- Movement joints with cracked, split or missing sealant
- Sealant that has lost its bond to the brick or render
How we handle external mastic in South Hornchurch
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. We pick a colour that sits well with the wall so the line blends in. If you have damp patches traced to an open external joint and failed sealant between panels on a façade, we can help, on brickwork movement joints, concrete & block and joints between brick and frames alike.
Modern London flats rely on sealed movement joints and cladding joints. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall, and both kinds of building are found across London.
You get a one-year guarantee, the same in South Hornchurch as everywhere else we work.
- Location
- South Hornchurch (RM13, RM10, RM12)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How the visit works
The work is kept neat and contained to the joints we’re treating, so you can carry on as normal. The job usually takes a few hours to a few days, depending on the length of joint and the access, and we tell you how long to leave it before we go. In South Hornchurch, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Let us know if you’ve seen damp or leaks
- For business premises, tell us about site rules or sign-in
- Keep children and pets away from the work area
How to get a quote
We don’t publish a price list, as no two jobs are quite the same. Instead, we give you a clear quote for your job. To get started, ring 0345 464 0079 or send us an email.
Read more
Signs you need external mastic in South Hornchurch
A lot of failed joints come down to preparation: dusty or wet faces, no primer where one was needed, or old sealant left in. The new sealant then lets go long before it should.
Any of these means the joints need attention:
- Hard, crazed mastic that has stopped moving
- Movement joints with cracked, split or missing sealant
- Sealant pulling away from one side of the joint
- Failed seals between different materials
South Hornchurch is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Questions to ask before booking
- Whether they seal over old material or remove it
- Whether the sealant suits the joint
- How long the guarantee is
- What preparation is included
How the job changes by surface
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant so the movement is taken up.
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.
How we quote for external mastic
We quote each job individually. These are the things that affect it:
- How many areas need sealing
- The type of sealant required
- When we can work, for business premises
- Whether there’s mould to deal with
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Helping us quote
You don’t need to know the technical terms. It helps if you can tell us:
- The type of property
- Photos by email, if that is easy
- Roughly how big the job is
- What the problem is, such as mould, gaps, leaks or cracking
We quote each job on its own, so start by telling us what you need. Simply phone 0345 464 0079 or send us an email and describe the job.
Places near South Hornchurch
Also in South Hornchurch
Why it’s worth doing now in South Hornchurch
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The movement then cracks the brickwork or render nearby. The correct repair is a flexible sealant with the right backing. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in South Hornchurch, the repair is bigger than a sealant job.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we’ll go through it with you.
Why book with us
- Any old sealant cut out fully, not covered over
- Anti-fungal silicone where joints get wet
- An ARBOMaster approved applicator
- Over 20 years’ experience
Read what affects the cost or customer reviews.
Looking after it afterwards
After the cure time, these simple habits help:
- Clear growth from the base of walls and joints
- Make sure movement joints are not pointed over
- Show decorators and builders where the movement joints are
- Have failed joints looked at early
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick.
South Hornchurch buildings and the weather
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. Historic houses like Rainham Hall (about 0.9 miles south) are a reminder that the area around South 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.
For landlords with property near Rainham (Essex) station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Managing a site like Whybridge Junior School? Then larger buildings have long runs of movement joint that eventually need resealing.
South Hornchurch is about 3 miles south of Romford, in Greater London. Homes, rented property, offices and hotels in South Hornchurch can book us for external mastic. The work is guaranteed for a year. Our Greater London coverage runs to 764 places, South Hornchurch among them. We also work in London, around 12 miles away.
We work across the RM13, RM10 and RM12 postcode area for external mastic. External mastic is available to properties on Hood Road, Ford Lane and Philip Road. We also cover Beam Park (1 mile south-west), Rainham (1 mile south-east), Hornchurch Marshes (1 mile south-west), Dagenham (1 mile north-west) and Elm Park (1 mile north-east). Within a short drive, we also cover London (12 miles west), City of Westminster (15 miles west), Marylebone (14 miles west), St Pancras (13 miles west), Shoreditch (11 miles west) and Walthamstow (10 miles north-west).
Landmarks near South Hornchurch
Around South Hornchurch, our work takes us to homes and buildings near The Bell pub, The Brittons Academy and Beam Valley Country Park and the streets around them. South Hornchurch’s nearest station is Rainham (Essex) station, about 0.9 miles south of the centre. Well-known places in the area include St George's Hospital (1.9 miles north-east) and The Brewery (3.1 miles north). For a walk, there’s Ingrebourne Marshes.
Honest limits
We’d rather tell you now than do work that won’t last, so these are the limits:
- Damp that isn’t coming from the joint
- Cracks in the bricks or render themselves, away from the joints
- Render that is blown, hollow or coming away
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly.
Where we work in South Hornchurch
- Brickwork movement joints
- Copings & trims
- Façade panels
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
Questions from South Hornchurch
Is parking an issue for external mastic in South Hornchurch?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Do you work for landlords with property near Rainham (Essex) station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Why is there a gap in my brick wall?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking, and it should be sealed with a flexible sealant.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you do not need to watch us work.
Why do you put foam in the joint first?
Backing rod controls the sealant depth and keeps it off the back of the joint. Then the sealant bonds to two faces and can move.
Do you work in South Hornchurch?
Yes. We’re based in Crawley and work across South East England, London and Scotland, and that includes South Hornchurch.
How long does external mastic last?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Every job carries our 12-month guarantee.
Can you seal joints between render and window frames?
Yes. Materials like render, brick, metal and uPVC all move differently, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.