Greater London · England
Shacklewell External Mastic
Our applicators work in Shacklewell on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Sealant pulling away from one side of the joint
- Hard, crazed mastic that has stopped moving
- Rain getting behind render or cladding at a joint
External mastic in Shacklewell, done properly
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. If you’re dealing with old sealant gone brittle and cracked and rain getting behind render or cladding at a joint, we can put it right.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. In Shacklewell, joints up high may need ladders or other access, which is worth talking through when you book.
Every job comes with a one-year guarantee, wherever you are in Greater London.
- Location
- Shacklewell (N16, E8, E5)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What happens if it’s left?
Running new sealant over the old bead rarely lasts. The new layer cannot bond properly to old, weathered material, so we always take the old sealant out. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble.
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Why us?
- Trusted Arbo and Everbuild sealants
- A 12-month guarantee on all work
- 20+ years of sealant experience
- Domestic, commercial and hotel work
Take a look at what affects the cost or customer reviews.
Outside joints around Shacklewell
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. In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking.
For landlords with property near Rectory Road station, split movement joints are easy to miss on a rental until damp shows inside. Schools such as The Petchey Academy are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Homes close to Church of St Barnabas include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Shacklewell is about 1 mile east of Highbury, in Greater London. If you need external mastic in Shacklewell, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover Greater London from our Crawley base. Across Greater London, we cover 764 places, Shacklewell among them.
Postcode districts we cover here for external mastic: N16, E8 and E5. If you need external mastic at a property on Muir Road, Allen Road and Downs Road or a nearby road, we can help. With the A107 close by, Shacklewell is easy for our applicators to reach. We also cover the places around Shacklewell: West Hackney (1 mile north), Dalston (1 mile south), Kingsland (1 mile south-west), Newington Green (1 mile west) and Mildmay (1 mile south-west). We also work in nearby towns such as London (4 miles south), City of Westminster (4 miles south-west), Marylebone (4 miles south-west), Kensington (7 miles south-west), St Pancras (3 miles south-west) and Walthamstow (3 miles north-east).
Near you in Shacklewell
Typical jobs here are in homes near Kingsland Secondary School, The Shacklewell Arms and Shacklewell Primary School, among other places. There’s a railway station in Shacklewell itself: Rectory Road station. Other landmarks nearby include Montfichet's Tower (3 miles south-west) and German Hospital (under half a mile south). Open spaces near Shacklewell include Hollow Pond and Woodberry Wetlands.
FAQs for Shacklewell
Do you cover Shacklewell for external mastic?
Yes, Shacklewell is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear price.
Can parking be tricky for a visit in Shacklewell?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Which products do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference.
Do you work at height?
It depends on the height and the site. Low-level joints are straightforward; for higher ones, send details and we’ll confirm the access.
Do you seal joints where cladding meets other materials?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. We pick a colour that works with both materials.
I’m a tenant. Can you help?
Yes. Ask your landlord first, and we can send them the quote if that helps.
How long does external mastic take?
Typically it takes anything from a few hours to several days, depending on the building. Larger jobs naturally take longer, and we’ll tell you how long to expect.
What does external mastic cost?
There’s no set price, as it 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.
How it works
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes anything from a few hours to several days, depending on the building. 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.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- 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.
Getting ready for the visit
- Let us know about parking restrictions
- Mention if the joints have been sealed before
- Mention any tricky access
Ask for a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Read more
Places near Shacklewell
Also in Shacklewell
Different surfaces, different methods
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap and keep the sealant to the right depth.
What affects the quote in Shacklewell
For a quick quote, just ask. What matters most is:
- Whether there’s mould to deal with
- The amount of work
- How much old sealant there is and how hard it is to remove
- How many rooms, windows or areas are involved
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Pictures of the joints, sent by email
- The address or postcode of the job
- How many joints, rooms or windows are involved
- How we’d reach the joints
Getting a quote is simple: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we will take it from there.
How to look after the new joints
After the cure time, these simple habits help:
- Never let anyone fill a movement joint with mortar
- Have failed joints looked at early
- Tell anyone working on the walls about the movement joints
- Look over the joints every year, ideally after winter
Don’t let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
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 so early resealing is worth it.
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Landlords, agents and businesses in Shacklewell
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.