Greater London · England
External & façade joints in Angel, Greater London
External mastic for Angel and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
- Old sealant gone brittle and cracked
How we handle external mastic in Angel
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. We are often asked to deal with hard, crazed mastic that has stopped moving and failed sealant between panels on a façade, across façade panels, render & cladding joints and copings & trims.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Place
- Angel (N1, N1P, EC1V)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Honest limits
A few problems are outside what sealant work can do:
- Cracking across the wall rather than at a joint
- Adding movement joints to masonry that has none
- Rising or penetrating damp from elsewhere in the wall
If you’re not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
- Copings & trims
- Façade panels
Towns and villages near Angel
Also in Angel
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Angel buildings and the weather
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. With historic houses such as Dr Johnson's House (about 1.2 miles south) nearby, there’s older building stock in the area around Angel as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
Schools such as St John Evangelist RC Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. Letting a property close to London Kings Cross station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Angel is about 1 mile north-east of St Pancras, in Greater London. For external mastic in and around Angel, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We are based in Crawley and cover Greater London. We cover 764 towns and villages across Greater London.
We cover every part of N1, N1P and EC1V for external mastic. Streets in the area include City Road, Noel Road and Dewey Road, and we cover them all. Main roads around Angel include the A501, so getting to you is simple. Other places close to Angel include Pentonville (1 mile north-east), Clerkenwell (1 mile south), Islington (1 mile north), St Pancras (1 mile south-west) and Kings Cross (1 mile west). Further out, we also cover Kensington (5 miles south-west), Walthamstow (5 miles north-east), Hampstead (3 miles north-west), Ruislip (13 miles west), Brompton (4 miles south-west) and Stockwell (4 miles south).
Around Angel
Typical jobs here are in homes near Risinghill School, Pilsudski Institute of London and The Angel pub. Also close by are Barnard Park (less than half a mile north-west) and Elizabeth Garrett Anderson School (under half a mile west). For rail, the closest station is London Kings Cross station, roughly 0.7 miles west. A little further out are Finsbury Health Centre (0.5 miles south) and Museum of Funeral History (under half a mile south). The countryside around Angel includes Barnsbury Wood and St. James's Park Lake.
What we do, step by step
You do not need to clear the whole room or building, just the space around the work. Everything nearby is protected, and the job takes a few hours for a handful of joints, longer for a whole elevation for a typical job. In Angel, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Getting ready for the visit
- Mention any parking rules near the property
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any previous sealing or DIY attempts
How to get a quote
We quote each job on its own, so the first step is telling us about yours. Simply call 0345 464 0079 or drop us an email and describe the job, and pictures are welcome.
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Questions from Angel
Is parking an issue for external mastic in Angel?
Parking in Angel, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Is Angel in your area for external mastic?
Yes. We work across London and the South East, and Angel is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
What is backing rod for?
We fit closed-cell backing rod wherever the joint depth needs controlling. It sets the sealant depth and prevents three-sided bonding.
Where are you based?
We’re based in Crawley, and we work across South East England, London and Scotland.
How long does external mastic take?
A typical job takes a few hours to a few days, depending on the length of joint and the access, including the preparation. We will confirm how long when we quote.
Is the work guaranteed?
Yes, always. There’s a 12-month guarantee on every job.
When will the joints need doing again?
It varies with how exposed the wall is and how much the joint moves. Look for splits, hardening or edges coming away and have them redone then.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.
Common problems we fix in Angel
If plants are growing out of a joint, the sealant has usually failed or was never there. Dirt and roots then trap moisture in the joint and speed up the damage.
If you can see any of these, it’s time to have the joints looked at:
- Failed seals between different materials
- Leaking joints around cladding and façade panels
- Plants rooting in failed movement joints
- Rain getting behind render or cladding at a joint
Angel is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Before booking anyone
- Who turns up on the day
- How hidden problems are handled
- Whether the sealant suits the joint
- Are they insured?
Quotes for external mastic in Angel
We quote each job individually. These are the things that affect it:
- How many areas need sealing
- The number and length of the joints
- When we can work, for business premises
- Whether there’s mould to deal with
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote.
What we need to know
To help us quote quickly, please include:
- Any access issues, like height or stairs
- What the problem is, such as mould, gaps, leaks or cracking
- If it’s domestic, commercial or a hotel
- Where the property is
Want a quote for external mastic? Please call 0345 464 0079 or email us with a few details. We will explain what we’d do and give you a clear price before any work starts.
Aftercare tips
To keep the joints looking good and working properly:
- Clear growth from the base of walls and joints
- Fix overflowing gutters above sealed joints
- Leave the joints unpainted unless we’ve said otherwise
- Get split or bare joints resealed while the damage is small
Do not let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Different surfaces, different methods
Render joints
Cracks along render joints let water in behind the coat. A sound joint keeps the render dry behind and protects the render itself.
Joints between dissimilar materials
Each side of the joint may need its own preparation. We prepare both faces so the sealant bonds properly.