Greater London · England
External Mastic in Gallows Corner
Sealing brickwork movement joints, render, cladding and façade joints for Gallows Corner, backed by a one-year guarantee. Ask us for a quote.
- Plants rooting in failed movement joints
- Damp patches traced to an open external joint
- Panel joints letting water in
What happens if it’s left?
Done well, a resealed joint is a neat, straight line that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner, so it pays to do it properly once. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or email us and we will talk you through it.
Why book with us
- White, clear, grey or coloured to suit, where the product allows
- Over 20 years’ experience
- Full insurance on every job
- Trusted Arbo and Everbuild sealants
See how sealant jobs are priced and our reviews.
How we handle external mastic in Gallows Corner
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 joint does not stand out. We work on copings & trims, concrete & block and render & cladding joints, and the jobs we see most are cracked joints where brick meets render or frames and weathered mastic that no longer stretches.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
You are covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or drop us an email.
- Where
- Gallows Corner (RM3, RM2, RM11)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Outside joints around Gallows Corner
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. Historic houses like Hare Hall (about 0.5 miles south) are a reminder that the area around Gallows Corner has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Rented homes near Gidea Park station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. For site and facilities teams at buildings such as Royal Liberty School, its movement joints, gutters and trims need looking after like any other building’s.
Gallows Corner is about 2 miles north-east of Romford, in Greater London. Our applicators cover external mastic for homes and businesses in Gallows Corner and nearby, as part of our work across Greater London. We cover 764 towns and villages across Greater London, from the larger towns to small villages. You can also see our page for London, roughly 15 miles from Gallows Corner.
All of RM3, RM2 and RM11 is within our area for external mastic. Whether your property is on Ewan Road, Briar Road and Bell Avenue or anywhere close by, our applicators can take on the job. Neighbouring places we cover for external mastic include Gidea Park (1 mile west), Ardleigh Green (1 mile south), Harold Wood (1 mile east), Heath Park (1 mile south) and Emerson Park (1 mile south-east). Further out, we also cover London (15 miles south-west), St Pancras (15 miles west), Shoreditch (13 miles west), Walthamstow (10 miles west), Hoxton (13 miles west) and Whitechapel (13 miles south-west).
Near you in Gallows Corner
Around Gallows Corner, our work takes us to homes and buildings near Havering College of Further and Higher Education, Ardleigh Green Junior School and Raphael Park, among other places. The nearest railway station is Gidea Park station, about 0.8 miles south-west. Nearby you’ll also find Upminster Tithe Barn Museum of Nostalgia (2.6 miles south-east) and Harold Wood Hospital (0.6 miles east). For a walk, there’s Bedfords Park.
How to look after the new joints
So the new joints stay in good condition:
- Check the sealant is paintable before painting near it
- Wash walls gently around the sealant
- Show decorators and builders where the movement joints are
- Never let anyone fill a movement joint with mortar
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
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.
What happens on the day
When we arrive, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before any work begins. Most jobs take a few hours to a few days, depending on the length of joint and the access. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Gallows Corner. It helps if you can point us to a visitor permit or a bay close to the door.
- 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.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Keep children and pets away from the work area
- Tell us about any water getting in
- Clear the area around the work
How to get a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved and give you a clear quote.
Read more
Different surfaces, different methods
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. Each joint gets a sealant that suits the panel and its movement.
When to call us in Gallows Corner
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.
These are the problems we are asked about most:
- Failed seals between different materials
- Joints pointed up with cement by mistake
- Moss and dirt in joints with no sealant left
- Sealant that has lost its bond to the brick or render
In the older streets around St Michael and All Angels Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Before booking anyone
- Is VAT in the price?
- Which colour the sealant will be
- How the surfaces are prepared before sealing
- Whether they seal over old material or remove it
Nearby places to Gallows Corner
More services for Gallows Corner
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
What affects the cost of external mastic
We do not publish a price list. What we look at:
- The product the joint needs
- How many rooms, windows or areas are involved
- Whether old sealant or filler has to be cut out
- When we can work, for business premises
Doing several joints on one visit is usually more efficient than separate visits, so it’s worth mentioning everything you’d like done. We will give you a clear price for the lot.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- The type of property
- Where the property is
- How many joints, rooms or windows are involved
- The problem you’ve noticed
To get a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. You will have a clear quote before work begins.
Gallows Corner: your questions answered
Is parking an issue for external mastic in Gallows Corner?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you cover Gallows Corner for external mastic?
Yes, Gallows Corner is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or send us an email and tell us what needs doing.
Do you guarantee your work?
Yes, for a year. If anything isn’t right with the work within the year, let us know and we’ll sort it.
Can you quote for more than one area?
Yes. Just list everything you need and you’ll get one quote.
I’m a tenant. Can you help?
We are happy to deal with the tenant, landlord or agent. Just make sure your landlord agrees.
Can you seal over the old sealant?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
What’s an expansion joint in brickwork?
Walls move with heat, cold and moisture, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
Do you have insurance?
Yes. We’re fully insured.