Greater London · England
External & façade joints in New Charlton, Greater London
Movement joints in New Charlton need attention? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Old sealant gone brittle and cracked
- Rain getting behind render or cladding at a joint
- Sealant that has lost its bond to the brick or render
Why deal with it now?
Water gets in through a failed movement joint, behind render and cladding. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in New Charlton, the repair is bigger than the sealant job would have been.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Why us?
- 20+ years of sealant experience
- You choose the colour before work begins
- Full insurance on every job
- We leave the area clean and tidy
See what affects the cost and what customers say.
External mastic for homes and businesses in New Charlton
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two. Common call-outs are for plants rooting in failed movement joints and rain getting behind render or cladding at a joint, across concrete & block, render & cladding joints and façade panels.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
Your job is guaranteed for a year, as with all our work.
- Place
- New Charlton (SE7, SE18, E16)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Walls and rooflines in New Charlton
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
In the older streets around St Catherine Labouré, an extension built onto an older house moves differently, and the joint between them takes the strain. As a London address, New Charlton can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
New Charlton is about 2 miles north-east of Greenwich, in Greater London. New Charlton gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. New Charlton is one of 764 places in Greater London we cover for external mastic. There’s also a page for London, roughly 6 miles from New Charlton.
All of SE7, SE18 and E16 is within our area for external mastic, from the main roads to the quietest streets. If you need external mastic at a property on Floyd Road, Priolo Road and Hasted Road or anywhere close by, we can help. Nearby, we also carry out external mastic in Charlton (1 mile south-east), Westcombe Park (1 mile south-west), Woolwich (1 mile east), Vanbrugh Park Estate (1 mile south-west) and Maze Hill (2 miles south-west). We also work in nearby towns such as London (6 miles west), City of Westminster (8 miles west), Marylebone (8 miles west), Kensington (10 miles west), St Pancras (7 miles west) and Shoreditch (5 miles north-west).
Around New Charlton
In New Charlton, that means homes and buildings near Thames Barrier Park, Thorntree Primary School and The Victoria pub and the streets around them. New Charlton has its own railway station: Charlton station. Other landmarks nearby include Charlton Athletic Museum (within half a mile south) and Greenwich Castle (1.9 miles south-west). Green spaces nearby include Gilbert's Pit.
What happens on the day
On the day, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before work begins. The work generally takes a few hours to a few days, depending on the length of joint and the access. In New Charlton, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Mention any tricky access
- Mention any leaks or damp you’ve noticed
- Clear the area around the work
How to get a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved and give you a clear quote.
Advice
Common problems we fix in New Charlton
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
People usually contact us after spotting one of these:
- Old sealant gone brittle and cracked
- Failed sealant between panels on a façade
- Moss and dirt in joints with no sealant left
- Brick movement joints where the sealant has split
If you let a flat or house near Charlton station, split movement joints are easy to miss on a rental until damp shows inside.
What your quote should include
- How hidden problems are handled
- Whether you can choose the colour
- What preparation is included
- Is VAT in the price?
Surface by surface
Concrete and blockwork
The face of concrete or block is often dusty, so preparation is key. We prime where the sealant needs it before the bead.
Copings and trims
A failed coping joint lets water into the top of the wall. Resealing them is a small job that protects a lot.
Looking after it afterwards
After the cure time, these simple habits help:
- Check external joints each spring
- Keep high-pressure jets off the joints
- Make sure movement joints are not pointed over
- Clear growth from the base of walls and joints
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years.
What sealant work can’t fix
We’ll always be straight with you, so here’s what sealant can’t fix:
- Cracked brickwork or render that needs a builder or plasterer
- Walls that need new movement joints cut into them
- Render that’s blown, hollow or coming away
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before you book.
What we seal
- Render & cladding joints
- Concrete & block
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
FAQs for New Charlton
Can parking be tricky for a visit in New Charlton?
Parking in New Charlton, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you work for landlords with property near Charlton station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Why is there a gap in my brick wall?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.
Can new sealant go over the old?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose. A flexible sealant is the right fill.
Can you seal joints between render and window frames?
Yes. Where different materials meet is one of the most common joints we seal. We use a flexible sealant suited to both surfaces.
Is it messy?
Tidy work is part of the job. We protect what’s around the joints, and the area is left clean when we finish.