Greater London · England
Woolwich External Mastic
Our applicators work in Woolwich on sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Leaking joints around cladding and façade panels
- Sealant pulling away from one side of the joint
- Weeds or debris growing in open joints
About our external mastic in Woolwich
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. If you’re dealing with joints pointed up with cement by mistake and joints with sealant missing in places, we can put it right.
Outside work in London starts with access: side passages, upper floors and where to park. In Woolwich, joints up high may need ladders or other access, which is worth talking through when you book.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or drop us an email.
- Where
- Woolwich (SE18, E16, SE7)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in Woolwich
Do you cover Woolwich for external mastic?
Yes, Woolwich is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing, and we will give you a clear quote.
Do you work for landlords with property near Woolwich Dockyard station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or email us with the details for a clear quote.
Can I add another job to the visit?
Yes. Just list everything you need.
Are you ARBOMaster approved?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Do you use backing rod?
We fit closed-cell backing rod wherever the joint depth needs controlling. It controls the depth and stops the sealant bonding to the back, so the joint can move.
Can a movement joint be filled with mortar?
No. Cement or mortar cannot stretch. If it has already been filled, we can normally cut it out and reseal it.
How long before the joint can be used?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
Is it worth trying it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
External mastic in Woolwich: local notes
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. 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 Woolwich Dockyard station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. Historic houses such as Queen's House, about 2.9 miles west, show how far back building around Woolwich goes, and older homes nearby need a sealant that suits their walls.
Woolwich is about 6 miles south-east of Leyton, in Greater London. Jobs in 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, Woolwich among them. For nearby work, see our London page.
Here we cover the SE18, E16 and SE7 postcode area for external mastic. Whether your property is on Market Street, Woolwich High Street and Beresford Square Market Place or anywhere close by, our applicators can take on the job. Close by, we work in Plumstead (1 mile east), Charlton (1 mile west), New Charlton (1 mile west), Shooter's Hill (1 mile south) and Kidbrooke (2 miles south-west). Further out, we also cover 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 (7 miles north-west).
What’s near Woolwich
Locally, jobs take us to homes and businesses close to Woolwich Common, Oasis Academy Silvertown and Oasis Academy Silvertown, among other places. There’s a railway station in Woolwich itself: Woolwich Dockyard station. A little further out are Royal Artillery Museum (0.5 miles north-east) and British Hospital for Mothers and Babies (0.5 miles west). Open spaces near Woolwich include Gilbert's Pit.
Signs you need external mastic in Woolwich
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The new sealant then lets go long before it should.
The problems people usually mention when they call are:
- Rigid filler in a joint that should flex
- Joints where the bead has come unstuck
- Moss and dirt in joints with no sealant left
- Gaps where render, brick and frames meet
Woolwich is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Questions to ask before you book
- When the joint can take water or movement
- Whether the sealant suits the joint
- Whether they seal over old material or remove it
- Who turns up on the day
Places near Woolwich
Also in Woolwich
Different surfaces, different methods
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant so neither cracks the other.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. Each joint gets a sealant that suits the panel and its movement.
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- Rising or penetrating damp from elsewhere in the wall
- Cracks in the bricks or render themselves, away from the joints
- Loose or hollow render, which needs re-rendering
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
Where we work in Woolwich
- Copings & trims
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
- Façade panels
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Deal with leaking gutters that soak the joints below
- Keep movement joints as flexible joints, not mortar
- Check the sealant is paintable before painting near it
- Get split or bare joints resealed while the damage is small
Do not let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
Once a joint cannot move, the wall finds another way, usually as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
The process
There is not much for you to do on the day. Point us to the joints and we will get on with it. The job generally takes a few hours for a handful of joints, longer for a whole elevation, including the tidy-up. For a job in Woolwich, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Mention if the joints have been sealed before
Get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that is easy.
Related advice
What happens if it’s left?
A failed movement joint lets water into the wall. Dealing with it early keeps the repair to the joint, rather than the wall around it. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble for homes in Woolwich.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why us?
- Tidy, careful work
- We are fully insured
- Trusted Arbo and Everbuild sealants
- Approved under the ARBOMaster scheme
What affects the quote in Woolwich
Your quote is based on your job. We take into account:
- How many areas need sealing
- When we can work, for business premises
- Whether there’s mould to deal with
- How much old sealant there is and how hard it is to remove
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first.
Asking for a quote
To make quoting easier, please include:
- Whether it’s a home or a business
- If someone has resealed it before
- Where the job is, and your postcode
- How we’d reach the joints
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we’ll talk you through the work before giving you a price.