Greater London · England
External Mastic in Stratford
Sealing brickwork movement joints, render, cladding and façade joints in Stratford, with a 12-month guarantee on every job. Call for a quick quote.
- Water getting into walls through failed joints
- Sealant that has lost its bond to the brick or render
- Rigid filler in a joint that should flex
How we handle external mastic in Stratford
Getting the depth right is half the job. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. We work on brickwork movement joints, joints between brick and frames and copings & trims, and people most often call us about water getting into walls through failed joints and hard, crazed mastic that has stopped moving.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so a leaking gutter joint or failed wall joint can affect more than one home. For a flat in Stratford, check the lease for who looks after the outside.
All our work comes with our 12-month guarantee, wherever you are in Greater London.
- Place
- Stratford (E15, E20, E3)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens if it’s left?
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost near the open joint, so the damage spreads beyond the joint. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
Why Stratford clients choose us
- Over 20 years’ experience
- Arbo and Everbuild products
- Approved under the ARBOMaster scheme
- Sealant colour chosen to suit
Read our cost guide and what customers say.
Common questions in Stratford
Is Stratford in your area for external mastic?
Yes, Stratford is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
Is parking a problem for a job in Stratford?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
What colours does the sealant come in?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin, matched as closely as the range allows.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done.
Do you seal joints where cladding meets other materials?
Yes. Different materials move at different rates, so the joint between them must be flexible. The sealant is matched to both sides.
When will the joints need doing again?
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.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us, and we’re fully insured.
The process
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. Once we have agreed what’s being done, the area is protected and the work begins. Most jobs take a few hours for a handful of joints, longer for a whole elevation. In a London area like Stratford, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- First, the joints are inspected and the access agreed.
- 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.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- Mention any sign-in or site rules at work premises
- Mention any leaks or damp you’ve noticed
Ask for a quote
Every job is quoted individually, so start by telling us what you need. Simply ring 0345 464 0079 or email us and describe the job.
Advice
Keeping the joints in good condition
So the new joints stay in good condition:
- Keep water from gutters off the wall
- Never let anyone fill a movement joint with mortar
- Show decorators and builders where the movement joints are
- Ask before painting over external sealant
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
What the job involves on each surface
Render joints
Cracks along render joints let water in behind the coat. A sound joint keeps the render dry behind and protects the render itself.
Copings and trims
A failed coping joint lets water into the top of the wall. Sealing them early saves the wall below.
Common problems we fix in Stratford
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall and speed up the damage.
The most common problems we see are:
- Joints where the bead has come unstuck
- Panel joints letting water in
- Weeds or debris growing in open joints
- Hard, crazed mastic that has stopped moving
In the older streets around Church of St John the Evangelist, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What your quote should include
- Is VAT in the price?
- Are they insured?
- Is the old sealant removed completely?
- Who does the work, and how experienced they are
Also near Stratford
Other services in Stratford
Honest limits
We won’t take on work that won’t last, so here’s what sealant can’t put right:
- Adding movement joints to masonry that has none
- Damp that isn’t coming from the joint
- Cracks in the bricks or render themselves, away from the joints
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think before booking.
What we seal
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Render & cladding joints
- Concrete & block
- Copings & trims
External mastic in Stratford: local notes
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. 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.
Stratford is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. For landlords with property near Stratford (London) station, split movement joints are easy to miss on a rental until damp shows inside.
Stratford is about 5 miles north-east of London, in Greater London. We provide external mastic to homeowners, landlords and businesses in Stratford, as part of our work across Greater London. Across Greater London, we cover 764 places, and Stratford is one of them.
All of E15, E20 and E3 is within our area for external mastic. External mastic is available to properties on Gay Road, Cam Road and Eve Road and the roads around them. Other places close to Stratford include Maryland (1 mile east), East Village (1 mile north-west), Temple Mills (1 mile north-west), West Ham (1 mile south-east) and Hackney Wick (1 mile west). Larger places within reach include London (5 miles south-west), City of Westminster (7 miles west), Marylebone (6 miles west), Kensington (9 miles west), St Pancras (5 miles west) and Shoreditch (3 miles west).
What’s near Stratford
Locally, jobs take us to homes and businesses close to Carpenters Primary School, The Two Puddings pub and Sarah Bonnell School, among other places. Stratford has its own railway station: Stratford (London) station. A little further out are Stratford Centre (under half a mile south-east) and V&A East (0.5 miles west). Green spaces nearby include Hollow Pond and Old Ford Island.
For landlords and businesses
Letting agents and landlords in Stratford can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for.
We also work for property managers and facilities teams in Stratford and across Greater London. We can quote a run of properties together.