Greater London · England
External Mastic in North Woolwich
Professional external mastic in and around North Woolwich, with old sealant always removed completely and a 12-month guarantee.
- Hard, crazed mastic that has stopped moving
- Sealant pulling away from one side of the joint
- Joints pointed up with cement by mistake
About our external mastic in North Woolwich
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. Common call-outs are for movement joints filled with mortar instead of sealant and leaking joints around cladding and façade panels, on brickwork movement joints, façade panels and render & cladding joints.
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 North Woolwich, check the lease for who looks after the outside.
You are covered for a year from the day we finish. If there’s a problem with it, please call 0345 464 0079 or email us.
- Where
- North Woolwich (SE18, E16, E6)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What we do, step by step
There is not much for you to do on the day. Show us the job and we will take it from there. The job generally takes a few hours to a few days, depending on the length of joint and the access from start to finish. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Mention if the joints have been sealed before
- Try not to wet indoor joints just before the visit
- Clear the area around the work
Get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Read more
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
When something else is needed
In fairness, some problems need a different trade:
- Render that is blown, hollow or coming away
- Rising or penetrating damp from elsewhere in the wall
- Walls that need new movement joints cut into them
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think before booking.
Joints and surfaces we work on
- Copings & trims
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Render & cladding joints
Nearby places to North Woolwich
Also in North Woolwich
What affects the quote in North Woolwich
Some jobs are bigger than they look, and some smaller. The main factors:
- The size of the job
- Any mould that needs treating
- The number of rooms or windows
- When we can work, for business premises
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. Your quote takes all of that into account.
What to tell us for a quote
When you call or email, these details help:
- If someone has resealed it before
- A few pictures by email, if you can
- The address or postcode of the job
- If it’s domestic, commercial or a hotel
We quote each job on its own. Just phone 0345 464 0079 or drop us an email with the details, and photos are welcome.
Common problems we fix in North Woolwich
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
These are the problems we’re asked about most:
- Water getting into walls through failed joints
- Weathered mastic that no longer stretches
- Panel joints letting water in
- Sealant that has lost its bond to the brick or render
For landlords with property near Woolwich Dockyard station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Questions to ask before booking
- What happens if the job turns out different
- Is VAT in the price?
- How the colour is chosen
- When the joint can take water or movement
Common questions in North Woolwich
Do you cover North Woolwich for external mastic?
Yes, North Woolwich is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job.
Can parking be tricky for a visit in North Woolwich?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Can landlords and businesses book you?
Yes, we do. We work in homes, commercial premises and hotels, and we are fully insured.
Do you work for hotels and businesses?
Yes. We can plan bigger jobs in stages.
Can you do several jobs on one visit?
Yes. Several rooms, windows or areas can go on one quote.
How much does external mastic cost in North Woolwich?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before we start.
Where do you work from?
We work from Crawley. We cover North Woolwich and the rest of Greater London.
Can you seal joints between render and window frames?
Yes. Materials like render, brick, metal and uPVC all move differently, so a flexible sealant is needed where they meet. The sealant is matched to both sides.
What external mastic looks like in North Woolwich
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Eastbury Manor House (about 2.9 miles north-east) are a reminder that the area around North Woolwich has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
In the older streets around St John's Church, older walls, gutters and the joints where extensions meet them need a flexible sealant. North Woolwich is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
North Woolwich is about 1 mile north of Woolwich, in Greater London. Jobs in North Woolwich get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Our Greater London coverage runs to 764 places, and North Woolwich is one of them. London is on our list too, around 7 miles away.
Postcode districts we cover here for external mastic: SE18, E16 and E6. You’ll find streets such as Drew Road, Tate Road and Pier Road, and we cover them all. Neighbouring places we cover for external mastic include Cyprus (1 mile north), Royal Docks (1 mile north-west), Beckton (1 mile north-east), Silvertown (1 mile west) and Custom House (1 mile west). We also work in nearby towns such as London (7 miles west), City of Westminster (9 miles west), Marylebone (9 miles west), Kensington (11 miles west), St Pancras (8 miles west) and Shoreditch (6 miles west).
Landmarks near North Woolwich
Around North Woolwich, our work takes us to homes and buildings near Beckton District Park, Drew Primary School and The Mitre pub, among other places. For rail, the closest station is Woolwich Dockyard station, roughly 0.7 miles south. Other landmarks nearby include British Hospital for Mothers and Babies (0.8 miles south-west) and Gallions Reach Shopping Park (1.1 miles north-east). For a walk, there’s Gilbert's Pit.
Why act early in North Woolwich
Done well, a resealed joint is a neat, straight line that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner so it’s worth doing right. In a flat in North Woolwich, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we will explain what it covers.
Why North Woolwich clients choose us
- Sanitary silicone with an anti-fungal additive in wet areas
- One-year guarantee on every job
- An ARBOMaster approved applicator
- Any old sealant cut out fully, not covered over
Different surfaces, different methods
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it. Tell us what the building has when you get in touch.
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.