Greater London · England
External Mastic in Edmonton
Specialist external mastic for Edmonton: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Sealant pulling away from one side of the joint
- Cracked joints where brick meets render or frames
- Plants rooting in failed movement joints
External mastic for homes and businesses in Edmonton
On houses, flats and commercial buildings across Edmonton, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. We’re often asked to deal with failed sealant between panels on a façade and weeds or debris growing in open joints, across concrete & block, joints between brick and frames and render & cladding joints.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. In Edmonton, joints up high may need ladders or other access, which is worth talking through when you book.
A 12-month guarantee comes as standard.
- Where
- Edmonton (N9, N18, N13, EN1)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. A few tips:
- Do not let climbing plants root in the sealant
- Look over the joints every year, ideally after winter
- Ask before painting over external sealant
- Keep water from gutters off the wall
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges and let water in behind.
A joint that has stopped moving pushes the movement elsewhere, normally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
Places near Edmonton
More services for Edmonton
Landlord and commercial work in Edmonton
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
The process
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The job generally takes a few hours for a handful of joints, longer for a whole elevation from start to finish. In Edmonton, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Keep children and pets away from the work area
- Move anything stored near the joints
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
To get a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. You’ll have a clear quote before work begins.
Related advice
Walls and rooflines in Edmonton
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Edmonton Green station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. For an older house near a landmark such as All Saints' Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Edmonton is about 9 miles north-east of City of Westminster, in Greater London. Homes, rented property, offices and hotels in Edmonton can book us for external mastic, old or new, large or small. The work is guaranteed for a year. Across Greater London, we cover 764 places, Edmonton among them. There’s also a page for London, roughly 9 miles from Edmonton.
All of N9, N18, N13 and EN1 is covered for external mastic, from the main roads to the quietest streets. We cover properties on The Broadway, Plevna Road and Galahad Road. Edmonton is on the B137 and B154, so it’s easy for us to get to. Other places close to Edmonton include Upper Edmonton (1 mile south), Picketts Lock (1 mile east), Northumberland Park (1 mile south), Ponders End (1 mile north-east) and Bush Hill Park (1 mile north-west). Larger places within reach include London (9 miles south), City of Westminster (9 miles south-west), Marylebone (8 miles south-west), Kensington (10 miles south-west), St Pancras (7 miles south) and Shoreditch (7 miles south).
Local landmarks in Edmonton
Around Edmonton, our work takes us to homes and buildings near NiW Furniture pub, The Latymer School and Starks Field School. Edmonton has its own railway station: Edmonton Green station. A little further out are Edmonton Green Shopping Centre (less than half a mile north-east) and North Middlesex University Hospital (1 mile south-west). Green spaces nearby include Highams Park Lake and Ainslie Wood.
When to call us in Edmonton
The wrong product in a moving joint is a classic cause. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Any of these means the joints need attention:
- Movement joints with cracked, split or missing sealant
- Plants rooting in failed movement joints
- Cracked joints where brick meets render or frames
- Old sealant gone brittle and cracked
Edmonton is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
What your quote should include
- What guarantee comes with the work
- How the surfaces are prepared before sealing
- Is the old sealant removed completely?
- Whether the sealant suits the joint
Different surfaces, different methods
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. The movement joint takes that up, so its sealant has to stay flexible.
Your questions about external mastic in Edmonton
Is parking a problem for a job in Edmonton?
Parking in Edmonton, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can you do external mastic in Edmonton?
Yes. We work across London and the South East, and Edmonton is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Edmonton and the rest of Greater London.
Do you guarantee your work?
Yes. There’s a 12-month guarantee on every job, large or small.
Do you remove the old sealant?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
What is backing rod for?
Backing rod goes into deeper joints as a matter of course. It controls the depth and stops the sealant bonding to the back so the bead can stretch.
How long does the job take?
Typically it takes a few hours to a few days, depending on the length of joint and the access. Bigger jobs take longer, and we’ll tell you how long to expect.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
How we quote for external mastic
There’s no set price list, because no two jobs are the same. What we look at:
- The size of the job
- Which sealant suits the joint
- Mould in or behind the old joints
- Working hours on commercial sites
What it costs depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before we start, so you know where you stand.
What to tell us for a quote
What to tell us when you ask for a quote:
- The type of property
- What the problem is, such as mould, gaps, leaks or cracking
- Where the property is
- Roughly how big the job is
We quote each job on its own. Simply ring 0345 464 0079 or send us an email and describe the job, and photos are welcome.
Why it’s worth doing now in Edmonton
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner so it’s worth doing right. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we’ll explain the quote if you ask.
Why book with us
- Full insurance on every job
- Over 20 years’ experience
- You choose the colour before work begins
- Arbo and Everbuild products