Greater London · England
External Mastic in Gants Hill
Sealing brickwork movement joints, render, cladding and façade joints in Gants Hill, with a 12-month guarantee on every job. Call for a quick quote.
- Panel joints letting water in
- Water getting into walls through failed joints
- Sealant that has lost its bond to the brick or render
How the visit works
You do not need to clear the whole room or building, just the space around the work. Everything nearby is protected, and the job takes a few hours to a few days, depending on the length of joint and the access in most cases. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Gants Hill. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Clear the area around the work
- Plan for the work area to be out of bounds to pets and children
- Let us know if you’ve seen damp or leaks
How to get a quote
To get a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. You’ll have a clear quote before we start.
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About our external mastic in Gants Hill
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we will confirm what access is needed. If you have sealant that has lost its bond to the brick or render and movement joints filled with mortar instead of sealant, we can put it right.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Gants Hill, tell us how high the joints are and how to reach the back of the building.
The work is covered for a year after we finish. If anything isn’t right with it, phone 0345 464 0079 or drop us an email.
- Where
- Gants Hill (IG2, IG6, IG1)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How we quote for external mastic
We quote each job individually. These are the things that affect it:
- Mould in or behind the old joints
- The type of sealant required
- When we can work, for business premises
- Whether the work is at height
Doing several joints on one visit usually makes better use of the time than several visits. You will get one clear quote for the whole job.
What we need to know
When you call or email, these details help:
- Roughly how big the job is
- Any previous sealing or DIY work
- Where the property is
- What the problem is, such as mould, gaps, leaks or cracking
We quote each job on its own. Just phone 0345 464 0079 or send us an email with the details and send photos if you have them.
Surface by surface
Concrete and blockwork
The face of concrete or block is often dusty, so preparation is key. A primer goes on where the product requires one before sealing.
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joint sealant has to cope with frequent movement. We choose the product to suit.
Places near Gants Hill
Also in Gants Hill
Do you need external mastic in Gants Hill?
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, so it pulls away from the edges.
People generally contact us when they notice something like this:
- Moss and dirt in joints with no sealant left
- Water getting into walls through failed joints
- Sealant pulling away from one side of the joint
- Failed sealant between panels on a façade
Rented homes near Ilford station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- Which sealant they’ll use, and why
- Is the old sealant removed completely?
- How long the guarantee is
- When the joint can take water or movement
What we cannot put right
A few problems are outside what sealant work can do:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Subsidence or other structural problems
- Render that’s blown, hollow or coming away
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think before you book.
Joints and surfaces we work on
- Brickwork movement joints
- Concrete & block
- Façade panels
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
Aftercare tips
After the cure time, these simple habits help:
- Keep high-pressure jets off the joints
- Check external joints each spring
- Point out the joints to other trades
- Don’t let climbing plants root in the sealant
Don’t paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants aren’t designed to be painted and spoil the finish.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Resealing it early helps prevent that.
Why act early in Gants Hill
Resealing a run of joints in one go is generally better than patching one at a time. Joints of the same age tend to fail together and it means sorting access once. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Gants Hill, the repair is bigger than a sealant job.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are unsure, call 0345 464 0079 or send us an email for an honest opinion and a quote.
Why us?
- We never seal over old sealant
- Over 20 years’ experience
- A 12-month guarantee on all work
- Rated 4.9 stars on Google
See our cost guide or customer reviews.
Gants Hill: your questions answered
Is parking a problem for a job in Gants Hill?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Is Gants Hill in your area for external mastic?
Yes. Our work covers London and the South East, and Gants Hill is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing.
How long before the joint can be used?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used before we leave.
Do you remove the old sealant?
Yes, always, and completely. New silicone does not stick to old silicone, so the joint is cleaned back first.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. A flexible sealant is the right fill.
Are you insured?
Yes. We are fully insured for every job we do.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Why do you put foam in the joint first?
Backing rod goes into deeper joints as a matter of course. It sets the sealant depth and prevents three-sided bonding, so the joint can move.
External mastic in Gants Hill: local notes
In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts. 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.
As a London address, Gants Hill can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Schools such as Gearies Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Gants Hill is about 3 miles north-east of Forest Gate, in Greater London. Every kind of property in Gants Hill can book us for external mastic, old or new, large or small. The work is guaranteed for a year. We cover 764 towns and villages across Greater London, from the larger towns to small villages. London is on our list too, about 9 miles from Gants Hill.
Postcode districts we cover here for external mastic: IG2, IG6 and IG1. External mastic is available to properties on Bute Road, Perth Road and Shere Road and the roads around them. Gants Hill is on the A123, which makes it straightforward to reach with everything needed for external mastic. Neighbouring places we cover for external mastic include Newbury Park (1 mile east), Barkingside (1 mile north-east), Redbridge (1 mile west), Cranbrook (1 mile south-west) and Ilford (1 mile south). Within a short drive, we also cover London (9 miles south-west), City of Westminster (11 miles south-west), Marylebone (10 miles south-west), Kensington (13 miles south-west), St Pancras (9 miles south-west) and Shoreditch (7 miles south-west).
Around Gants Hill
We work in homes and buildings around Valentines Park and Valentines High School, among other places. The nearest railway station is Ilford station, about 1.2 miles south. Well-known places in the area include Stratford Centre (3.9 miles south-west) and Goodmayes Hospital (1.7 miles east). Open spaces near Gants Hill include Hollow Pond and Hainault Lodge.