Greater London · England
External Mastic in East Ham
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in East Ham. Fully insured, ARBOMaster approved and guaranteed for a year.
- Rigid filler in a joint that should flex
- Sealant that has lost its bond to the brick or render
- Moss and dirt in joints with no sealant left
Why deal with it now?
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner. 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. Putting it right early is much less trouble.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why choose Mr Mastic in East Ham
- Anti-fungal sanitary silicone in wet areas
- Any old sealant cut out fully, not covered over
- Trusted Arbo and Everbuild sealants
- Colour agreed with you before work begins
About our external mastic in East Ham
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. We are often asked to deal with joints with sealant missing in places and plants rooting in failed movement joints, on brickwork movement joints, joints between brick and frames and render & cladding joints.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. 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.
Each job carries a 12-month guarantee, whatever its size.
- Where
- East Ham (E6, IG11, E13, E12)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Common questions in East Ham
I let a flat near Barking station. Can you help?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or email us with the details for a clear quote.
Can parking be tricky for a visit in East Ham?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Can a movement joint be filled with mortar?
No. Rigid materials cannot move with the wall and the joint fails. Where a joint has been mortared, it can often be raked out and sealed properly.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
When is the sealant fully cured?
Different products cure at different speeds, so follow the cure time we give you when we finish.
What is backing rod for?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
Do I have to be there?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Do you have insurance?
Yes. We are fully insured for every job we do.
How we quote for external mastic
Jobs vary more than people expect. What affects the quote:
- Mould in or behind the old joints
- The product the joint needs
- The amount of work
- How easy the joints are to reach
The cost depends on the size of the job, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Asking for a quote
What to tell us when you ask for a quote:
- Pictures of the joints, sent by email
- If someone has resealed it before
- Whether it’s a home or a business
- Roughly how big the job is
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. Whenever you’re ready, call 0345 464 0079 or send us an email.
What external mastic looks like in East Ham
With historic houses such as Eastbury Manor House (about 1.9 miles east) nearby, there’s older building stock in the area around East Ham as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts.
As a London address, East Ham can be tricky for parking: let us know about parking bays, permits or a driveway. For an older house near a landmark such as St Bartholomew's Church, the joints between older walls, newer extensions and the roofline need a sealant that can move. Rented homes near Barking station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
East Ham is about 5 miles south-east of Walthamstow, in Greater London. If you need external mastic in East Ham, please call 0345 464 0079 or email us for a quick quote. We are based in Crawley and cover Greater London, East Ham included. East Ham is one of 764 towns and villages in Greater London where we work for external mastic. You can also see our page for London, roughly 7 miles from East Ham.
Postcode districts we cover here for external mastic: E6, IG11, E13 and E12. If you need external mastic at a property on High Street South, Market Street and High Street North or a nearby road, our applicators can take on the job. Main roads around East Ham include the A13 and A117, so getting to you is simple. We also cover Wallend (1 mile north-east), Upton Park (1 mile west), Plashet (1 mile north), Beckton (1 mile south-east) and Greengate (1 mile west). Larger places within reach include London (7 miles west), City of Westminster (9 miles west), Marylebone (9 miles west), Kensington (11 miles west), St Pancras (7 miles west) and Shoreditch (6 miles west).
Landmarks near East Ham
Around East Ham, our work takes us to homes and buildings near The Miller's Well pub, Beckton District Park and The Service for Deaf and Partially Hearing Children and the streets around them. For rail, the closest station is Barking station, about 1.3 miles north-east. Nearby you will also find Greenwich Castle (4.3 miles south-west) and Gallions Reach Shopping Park (1.6 miles south-east). Open spaces near East Ham include Ripple Nature Reserve and Hollow Pond.
How it works
There isn’t much for you to do on the day. Point us to the joints and we will get on with it. The work itself takes a few hours to a few days, depending on the length of joint and the access from start to finish. In East Ham, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- Let us know about stairs, lifts or work at height
- Mention if the joints have been sealed before
- Clear items away from the joints we’re working on
Ask for a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
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Should I try it myself first?
A DIY attempt does not rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
What sealant work can’t fix
Before you book, it’s worth knowing the limits too:
- Failed render or damaged cladding panels
- Movement that’s more than a sealant joint can take
- Damp that isn’t coming from the joint
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly before booking.
Surfaces we seal
- Render & cladding joints
- Concrete & block
- Joints between brick and frames
- Copings & trims
- Façade panels
- Brickwork movement joints
What the job involves on each surface
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. We reseal their joints with backing rod and a flexible product.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
Work for landlords, hotels and businesses
For anyone letting property in or around East Ham, several properties can be quoted together. Send us the addresses and the work at each.
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.