Greater London · England
External Mastic in Forest Gate
Our applicators work in Forest Gate on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Rigid filler in a joint that should flex
- Sealant pulling away from one side of the joint
- Hard, crazed mastic that has stopped moving
What sealant work can’t fix
We’d rather tell you now than do work that won’t last, so here’s what sealant cannot put right:
- Failed render or damaged cladding panels
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Adding movement joints to masonry that has none
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
What we seal
- Copings & trims
- Joints between brick and frames
- Render & cladding joints
- Concrete & block
- Façade panels
- Brickwork movement joints
How we handle external mastic in Forest Gate
For buildings in Forest Gate, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. If you are dealing with sealant pulling away from one side of the joint and rain getting behind render or cladding at a joint, we can help, on brickwork movement joints, joints between brick and frames and copings & trims alike.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Forest Gate, tell us how high the joints are and how to reach the back of the building.
Whatever the size of the job, it’s backed by our 12-month guarantee in Forest Gate and across Greater London.
- Where
- Forest Gate (E7, E15, E11)
- Wider area
- Greater London
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the cost of external mastic
Call for a quick quote. What matters most is:
- The size of the job
- The type of sealant required
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
Doing several joints on one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
What to tell us for a quote
To make quoting easier, let us know:
- Whether it has been sealed before
- What the problem is, such as mould, gaps, leaks or cracking
- Any access issues, like height or stairs
- Photos by email, if that’s easy
Asking for a quote is easy: let us know what needs doing and where and its rough size. Photos by email help us understand the job.
What happens on the day
The work is kept neat and contained to the area we’re working on. Expect the work to take anything from a few hours to several days, depending on the building, and we explain the cure time before we leave. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Forest Gate. 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.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Mention any tricky access
- Let us know about parking restrictions
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
Every job is quoted individually, so start by telling us what you need. Simply ring 0345 464 0079 or send us an email and describe the job.
Related advice
Landlords, agents and businesses in Forest Gate
Letting agents and landlords in Forest Gate can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll quote.
When to call us in Forest Gate
Some movement joints have been pointed up with mortar by mistake. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Common reasons people contact us are:
- Failed seals between different materials
- Panel joints letting water in
- Movement joints filled with mortar instead of sealant
- Sealant that has lost its bond to the brick or render
Letting a property close to Wanstead Park station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What your quote should include
- The length of the guarantee
- What the quote includes, VAT included or not
- How the colour is chosen
- How the joint is cleaned and prepared
Questions from Forest Gate
Is Forest Gate in your area for external mastic?
Yes. Our work covers London and the South East, and Forest Gate is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
I let a flat near Wanstead Park station. Can you help?
Yes. We work for letting agents and landlords as well as householders, and several properties can go on one quote. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
Can a movement joint be filled with mortar?
No, not where the gap is a movement joint. Pointing it stops it working and can lead to cracking. A flexible sealant is the right fill.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses and we are fully insured.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Is there any odour?
It depends on the product. Some smell for a while, some hardly at all.
Can new sealant go over the old?
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 external mastic looks like in Forest Gate
Historic houses like Valentines Mansion (about 2.2 miles north-east) are a reminder that the area around Forest Gate 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. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you live in an older home near A Radical Church, an extension built onto an older house moves differently, and the joint between them takes the strain. Schools such as Woodgrange Infant School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Forest Gate is about 6 miles north-east of London, in Greater London. Homes, rented property, offices and hotels in Forest Gate is covered for external mastic, old or new, large or small. The work is guaranteed for a year. Forest Gate is one of 764 places in Greater London we cover for external mastic. Our London page covers work nearby.
Jobs for external mastic in E7, E15 and E11 is quoted and booked the same way as anywhere else. If you need external mastic at a property on Elm Road, Ash Road and Cary Road or a nearby road, we can help. Being close to the A114 and A116, Forest Gate is easy for our applicators to reach for external mastic. Neighbouring places we cover for external mastic include Upton (1 mile south), Aldersbrook (1 mile north), Holloway Down (1 mile west), Plashet (1 mile south-east) and Little Ilford (1 mile east). We also work in nearby towns such as London (6 miles south-west), City of Westminster (8 miles west), Marylebone (8 miles west), Kensington (10 miles west), St Pancras (6 miles west) and Shoreditch (5 miles west).
Local landmarks in Forest Gate
In Forest Gate, that means homes and buildings near Tyndale Academy, Forest Gate Community School and The Hudson Bay pub, among other places. Forest Gate has its own railway station: Wanstead Park station. Other landmarks nearby include Stratford Centre (1.3 miles south-west) and Passmore Edwards Museum (0.9 miles south-west). The countryside around Forest Gate includes Hollow Pond and Old Ford Island.
Why it’s worth doing now in Forest Gate
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The wall then cracks somewhere else. A flexible sealant over backing rod is what the joint needs. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Forest Gate, the repair is bigger than the sealant job would have been.
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, ring 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Why choose Mr Mastic in Forest Gate
- Sealant colour chosen to suit
- Experience in homes, commercial sites and hotels
- Approved under the ARBOMaster scheme
- Trusted Arbo and Everbuild sealants
Take a look at our cost guide or what customers say.
Surface by surface
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
Render joints
Water behind render can lead to blown patches. Resealing the joints early keeps water out.