Greater London · England
Edgware Bury External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Edgware Bury, with a 12-month guarantee on every job. Ask us for a quote.
- Cracked joints where brick meets render or frames
- Joints pointed up with cement by mistake
- Damp patches traced to an open external joint
How we handle external mastic in Edgware Bury
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the line blends in. We work on brickwork movement joints, copings & trims and façade panels, and common reasons people get in touch are joints pointed up with cement by mistake and failed sealant between panels on a façade.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall, and both kinds of building are found across London.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Edgware Bury (HA8)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Signs you need external mastic in Edgware Bury
A lot of failed joints come down to preparation: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
Most people get in touch when they notice one of these:
- Hard, crazed mastic that has stopped moving
- Gaps where render, brick and frames meet
- Movement joints filled with mortar instead of sealant
- Plants rooting in failed movement joints
Letting a property close to Elstree & Borehamwood station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
What your quote should include
- Whether they’re fully insured
- Who does the work, and how experienced they are
- Is the old sealant removed completely?
- How long to leave it before use
Surface by surface
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two so neither cracks the other.
Edgware Bury questions
Is parking a problem for a job in Edgware Bury?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Do you cover Edgware Bury for external mastic?
Yes. Our work covers London and the South East, and Edgware Bury is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear quote.
Should I point up the gap in my brickwork?
No, not where the gap is a movement joint. Pointing it stops it working. We’ll reseal it with a flexible sealant.
Where do you work from?
We are a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Do you do commercial work?
Yes, regularly. We can plan bigger jobs in stages.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we are done.
Can you match the colour of my brickwork?
The sealant colour is picked to suit the wall, so the joint sits quietly in the wall. There’s a wide choice of exterior colours.
Leave it or put it right?
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 a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Why Edgware Bury customers choose us
- Rated 4.9 stars on Google
- Colour picked to suit the job
- Anti-fungal sanitary silicone in wet areas
- We are fully insured
Take a look at what affects the cost or our reviews.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
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.
How it works
Once we are on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours to a few days, depending on the length of joint and the access. For a job in Edgware Bury, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- 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.
- 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.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Keep pets and children clear of the area while we work
- Mention any parking rules near the property
- Clear items away from the joints we’re working on
Getting a quote
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. A few pictures by email make the job easier to understand, and we’ll come back to you with a quote.
Advice
Also near Edgware Bury
What else we do in Edgware Bury
For landlords and businesses
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.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
What external mastic looks like in Edgware Bury
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. London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts.
Edgware Bury is in London, so parking needs planning: let us know about parking bays, permits or a driveway. In the older streets around St Andrew, an extension built onto an older house moves differently, and the joint between them takes the strain.
Edgware Bury is about 1 mile north-west of Edgware, in Greater London. We carry out external mastic for homes and businesses in Edgware Bury and the surrounding area, as part of our work across Greater London. Across Greater London, we cover 764 places, and Edgware Bury is one of them. We also work in London, about 12 miles from Edgware Bury.
Jobs for external mastic in HA8 works the same way as everywhere else we cover. If you are just outside Edgware Bury, we cover Broadfields Estate (1 mile south-east), Deacon's Hill (1 mile north), Elstree (1 mile north-west), Edgware (1 mile south-east) and The Hale (1 mile south-east). Within a short drive, we also cover London (12 miles south-east), City of Westminster (10 miles south-east), Marylebone (10 miles south-east), Kensington (10 miles south), St Pancras (10 miles south-east) and Shoreditch (11 miles south-east).
Near you in Edgware Bury
Locally, jobs take us to homes and businesses close to London Academy and Edgwarebury Park, among other places. The nearest railway station is Elstree & Borehamwood station, roughly 1.3 miles north. Other landmarks nearby include Royal National Orthopaedic Hospital (1 mile west) and Elstree and Borehamwood Museum (1.6 miles north). The countryside around Edgware Bury includes Edgware Way Grassland and Darland's Lake.
When it is not the sealant
New sealant cannot fix everything, and we will tell you before any work starts. Sealant will not put right:
- Cracking across the wall rather than at a joint
- Walls that need new movement joints cut into them
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think before booking.
Where we work in Edgware Bury
- Render & cladding joints
- Brickwork movement joints
- Façade panels
- Concrete & block
- Joints between brick and frames
- Copings & trims