Greater London · England
External & façade joints in Clapton, Greater London
Sealing brickwork movement joints, render, cladding and façade joints in Clapton, with a one-year guarantee on every job. Ask us for a quote.
- Damp patches traced to an open external joint
- Weathered mastic that no longer stretches
- Failed seals between different materials
External mastic in Clapton
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall. If you’re dealing with panel joints letting water in and water getting into walls through failed joints, we can put it right.
Modern London flats rely on sealed movement joints and cladding joints. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall.
All our work comes with a one-year guarantee.
- Where
- Clapton (E5, N16, E8)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
The process
On the day, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before any work begins. Most jobs take anything from a few hours to several days, depending on the building. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Clapton. A visitor permit or a nearby bay makes the visit run more smoothly.
- First we look over the joints with you, agree which to renew and talk through access.
- 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.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- Plan for the work area to be out of bounds to pets and children
- Clear the area around the work
- Let us know if you’ve seen damp or leaks
Ask for a quote
Asking for a quote is easy: tell us what needs doing and where. Photos by email help us understand the job, and we will come back to you with a quote.
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FAQs for Clapton
Is Clapton in your area for external mastic?
Yes. We work across London and the South East, and Clapton is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
I let a flat near Clapton station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can call 0345 464 0079 or email us with the details for a clear quote.
How long does external mastic last?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Every job carries our one-year guarantee.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first.
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. We choose one that suits both surfaces.
How long will you be here?
Typically it takes a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer, and we will say how long yours will take.
Is there any odour?
Some sealants have a smell while they cure, but it fades. Ventilation helps.
Is it OK to fill a movement joint with cement?
No. Cement or mortar can’t stretch. Where a joint has been mortared, it can often be raked out and sealed properly.
Different surfaces, different methods
Cladding and façade panels
Cladding and façade panels are usually separated by sealed joints. We reseal them with a sealant suited to the panel material.
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best year round.
Places near Clapton
What else we do in Clapton
Keeping the joints in good condition
Looking after new joints is easy:
- Show decorators and builders where the movement joints are
- Don’t let climbing plants root in the sealant
- Act on the first splits you see
- Keep movement joints as flexible joints, not mortar
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Resealing it early helps prevent that.
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
What we are called out for in Clapton
Some movement joints have been pointed up with mortar. The joint cannot move, so the wall cracks somewhere else instead.
It’s worth asking for a quote if you see:
- Brick movement joints where the sealant has split
- Hard, crazed mastic that has stopped moving
- Rain getting behind render or cladding at a joint
- Gaps where render, brick and frames meet
For site and facilities teams at buildings such as BSix Sixth Form College, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What to look for in a quote
- What the quote includes, VAT included or not
- How the colour is chosen
- How long to leave it before use
- Whether the sealant suits the joint
DIY sealant or a professional job?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Honest limits
We’ll always be straight with you, so here’s what new sealant won’t do:
- Render that is blown, hollow or coming away
- Cracked brickwork or render that needs a builder or plasterer
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before booking.
Surfaces we seal
- Façade panels
- Concrete & block
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
Outside joints around Clapton
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Clapton station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. In the older streets around Church of St James the Great, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Clapton is about 2 miles east of Highbury, in Greater London. From the centre of Clapton to the outskirts, external mastic is available for homes and businesses alike. Our Greater London coverage runs to 764 places, and Clapton is one of them.
Here we cover the E5, N16 and E8 postcode area for external mastic. External mastic is available to properties on Muir Road, Downs Road and Tilia Road. Other places close to Clapton include Lea Bridge (1 mile north-east), West Hackney (1 mile west), Homerton (1 mile south-east), Lower Clapton (1 mile south-east) and Shacklewell (1 mile south-west). Within a short drive, we also cover London (4 miles south), City of Westminster (5 miles south-west), Marylebone (5 miles south-west), Kensington (7 miles south-west), St Pancras (3 miles south-west) and Whitechapel (3 miles south).
Local landmarks in Clapton
Around Clapton, our work takes us to homes and buildings near The Amhurst Arms Public House, Baden-Powell School and Millfields Park, among other places. There’s a railway station in Clapton itself: Clapton station. Well-known places in the area include Clowns Gallery-Museum (1.2 miles south-west) and Tower of London (3.6 miles south). Not far away are Dartmouth Park Hill and Hollow Pond.