Greater London · England
De Beauvoir Town External Mastic
Movement joints in De Beauvoir Town need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Brick movement joints where the sealant has split
- Rain getting behind render or cladding at a joint
- Leaking joints around cladding and façade panels
What affects the cost of external mastic
The quote reflects the job in front of us. We look at:
- Any mould that needs treating
- The product the joint needs
- The number of rooms or windows
- Whether the work is at height
The cost depends on the size of the job, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
What to tell us for a quote
To help us quote quickly, please include:
- A few pictures by email, if you can
- What’s wrong with the joints now
- The type of property
- Roughly how big the job is
For external mastic in De Beauvoir Town, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you’ll get a clear quote before we start.
External mastic for homes and businesses in De Beauvoir Town
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 mortar or filler would crack. If you are dealing with rigid filler in a joint that should flex and weathered mastic that no longer stretches, we can put it right, whatever the surface.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so a leaking gutter joint or failed wall joint can affect more than one home. For a flat in De Beauvoir Town, check the lease for who looks after the outside.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Location
- De Beauvoir Town (N1, E8, N16)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
FAQs for De Beauvoir Town
Do you work for landlords with property near Dalston Junction station?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
Do you cover De Beauvoir Town for external mastic?
Yes, De Beauvoir Town is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing.
How long does external mastic take?
It depends on the size of the job, but as a guide it takes a few hours for a handful of joints, longer for a whole elevation. We’ll give you a better idea when we quote.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
What is a movement joint?
It’s a deliberate gap that lets the wall expand and contract without cracking. It should be filled with flexible sealant, never mortar.
How long does external mastic last?
It depends on the exposure, the movement and the product. Sealant is a maintenance item, so check the joints once a year.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures.
Can you quote for more than one area?
Yes. Just list everything you need and you will get one quote.
Should I try it myself first?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
When it is not the sealant
Before booking, it’s worth knowing the limits:
- Loose or hollow render, which needs re-rendering
- Cracking across the wall rather than at a joint
- Rising or penetrating damp from elsewhere in the wall
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before you book.
Surfaces we seal
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Copings & trims
- Façade panels
- Render & cladding joints
Different surfaces, different methods
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.
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
How it works
We bring everything the job needs with us. After a quick look at the joints together, the area is protected and the work begins. It normally takes a few hours for a handful of joints, longer for a whole elevation. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in De Beauvoir Town. It helps if you can point us to a visitor permit or a bay close to the door.
- 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.
- 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.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- Move anything stored near the joints
- Let us know about earlier repairs to the joints
- Try not to wet indoor joints just before the visit
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.
Related advice
Walls and rooflines in De Beauvoir Town
London terraces and converted houses often share gutters, downpipes and walls, 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 look after a building such as Our Lady and St Joseph Catholic Primary School, larger buildings have long runs of movement joint that eventually need resealing. For an older house near a landmark such as Church of St Peter, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Rented homes near Dalston Junction station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
De Beauvoir Town is about 1 mile north of Hoxton, in Greater London. From the centre of De Beauvoir Town to the outskirts, external mastic is available for homes and businesses alike. De Beauvoir Town is one of 764 towns and villages in Greater London we cover.
Postcode districts we cover here for external mastic: N1, E8 and N16. If you need external mastic at a property on Dove Road, Essex Road and Clare Lane or anywhere close by, we can help. Other places close to De Beauvoir Town include Kingsland (1 mile north-east), Canonbury (1 mile west), Mildmay (1 mile north), Dalston (1 mile east) and Newington Green (1 mile north). Within a short drive, we also cover London (3 miles south), City of Westminster (4 miles south-west), Marylebone (3 miles south-west), Kensington (6 miles south-west), Walthamstow (4 miles north-east) and Hampstead (4 miles west).
Around De Beauvoir Town
Around De Beauvoir Town, our work takes us to homes and buildings near Hackney New School, Bishopsgate Institute Special Collections and Archives and Kingsland Secondary School. You’ll also find The Prince of Wales pub (less than half a mile east) and Shoreditch Park (0.7 miles south-west). De Beauvoir Town has its own railway station: Dalston Junction station. Other landmarks nearby include Clowns Gallery-Museum (within half a mile east) and Montfichet's Tower (2.3 miles south-west). Open spaces near De Beauvoir Town include St. James's Park Lake and Ludgate Hill.
Landlord and commercial work in De Beauvoir Town
Landlords and agents in De Beauvoir Town can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
How to look after the new joints
So the new joints stay in good condition:
- Deal with leaking gutters that soak the joints below
- Walk round the building once a year and look at the joints
- Tell anyone working on the walls about the movement joints
- Don’t let climbing plants root in the sealant
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
Once a joint can’t move, the wall finds another way, generally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.