Greater London · England
Barking External Mastic
External mastic in Barking from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Cracked joints where brick meets render or frames
- Weeds or debris growing in open joints
- Hard, crazed mastic that has stopped moving
Your questions about external mastic in Barking
Is parking an issue for external mastic in Barking?
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.
Do you cover Barking for external mastic?
Yes, Barking is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Can a movement joint be filled with mortar?
No. A mortar-filled joint cannot move, so the movement cracks the wall elsewhere. It needs a flexible sealant over backing rod.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages to suit the site.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
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.
External mastic in Barking
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where a rigid filler would soon crack. If you are dealing with gaps where render, brick and frames meet and leaking joints around cladding and façade panels, we can put it right.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. In a converted house in Barking, it’s worth checking who is responsible for the outside before booking.
You get a one-year guarantee, the same in Barking as everywhere else we work.
- Where
- Barking (IG11, RM9, RM8, E6)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Common problems we fix in Barking
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
People generally contact us after spotting something like this:
- Cracked joints where brick meets render or frames
- Sealant that has lost its bond to the brick or render
- Plants rooting in failed movement joints
- Panel joints letting water in
As a London address, Barking can be tricky for parking: let us know about parking bays, permits or a driveway.
Comparing quotes
- What happens if they find a problem under the old sealant
- Whether VAT is included
- What preparation is included
- How the colour is chosen
Why it’s worth doing now in Barking
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render around the joint, so the problem grows beyond the joint itself. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why choose Mr Mastic in Barking
- White, clear, grey or coloured to suit, where the product allows
- A 12-month guarantee on all work
- 180+ five-star Google reviews
- More than 20 years in sealant work
Read what affects the cost or our reviews.
External mastic in Barking: local notes
With historic houses such as Eastbury Manor House (about 0.1 miles east) nearby, there’s older building stock in the area around Barking as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking.
Rented homes near Barking station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. If you look after a building such as Eastbury Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Barking is about 9 miles east of London, in Greater London. We provide external mastic to householders, landlords and businesses in Barking and the surrounding area. Our area takes in 764 places across Greater London, from the larger towns to small villages. London is on our list too, around 9 miles away.
Work in IG11, RM9, RM8 and E6 is quoted and booked the same way as anywhere else. If you need external mastic at a property on Eastbury Square, London Road and Church Road or a nearby road, we can help. Close by, we work in Loxford (1 mile north-west), Creekmouth (1 mile south), Wallend (1 mile west), East Ham (2 miles west) and Beckton (2 miles south-west). We also work in nearby towns such as London (9 miles west), City of Westminster (11 miles west), Marylebone (11 miles west), Kensington (13 miles west), St Pancras (9 miles west) and Shoreditch (8 miles west).
What’s near Barking
In Barking, that means homes and buildings near Mayesbrook Park, Greatfields School and The Barking Dog pub, among other places. For rail, the closest station is Barking station, roughly 0.8 miles north-west. Other landmarks nearby include East End Women's Museum (0.9 miles west) and Barking Community Hospital (less than half a mile north). Open spaces near Barking include Ripple Nature Reserve and Hollow Pond.
How the job changes by surface
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
Cladding and façade panels
Panels heat up and cool down quickly, so the joints work hard every day. We choose the product to suit.
What happens on the day
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes a few hours to a few days, depending on the length of joint and the access. In a London area like Barking, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- Let us know if you’ve seen damp or leaks
- Try not to wet indoor joints just before the visit
How to get a quote
To get a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. You’ll have a clear quote before work begins.
Related advice
For landlords and businesses
We work for letting agents and landlords as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
What else we do in Barking
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Failed render or damaged cladding panels
- Cracked brickwork or render that needs a builder or plasterer
- Movement that’s more than a sealant joint can take
If you’re not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer.
What we seal
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Concrete & block
- Brickwork movement joints
Quotes for external mastic in Barking
Jobs vary more than people expect. The main factors:
- The type of sealant required
- The size of the job
- Whether old sealant or filler has to be cut out
- Whether the work is at height
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- The rough size of the job
- The problem you’ve noticed
- Whether it has been sealed before
- How we’d reach the joints
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.