Greater London · England
External Mastic in Brentham Garden Suburb
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Brentham Garden Suburb. Fully insured, ARBOMaster approved and guaranteed for a year.
- Sealant pulling away from one side of the joint
- Brick movement joints where the sealant has split
- Leaking joints around cladding and façade panels
About our external mastic in Brentham Garden Suburb
Getting the depth right is half the job. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. We are often asked to deal with failed sealant between panels on a façade and movement joints filled with mortar instead of sealant, across brickwork movement joints, joints between brick and frames and concrete & block.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
Our work is backed for twelve months, in Brentham Garden Suburb and everywhere else we cover.
- Where
- Brentham Garden Suburb (W5, W13, UB6)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Common questions in Brentham Garden Suburb
Is parking an issue for external mastic in Brentham Garden Suburb?
Parking in Brentham Garden Suburb, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you cover Brentham Garden Suburb for external mastic?
Yes, Brentham Garden Suburb is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or send us an email and let us know what needs doing, and we’ll send you a clear quote.
Do you remove the old sealant?
Yes, always, and completely. New sealant won’t bond properly to old, so the joint is cleaned back first.
I’m a tenant. Can you help?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Are you an approved applicator?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
How long before the joint can be used?
Different products cure at different speeds, so please follow the time we give you.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We will tell you what we’re using and why.
For landlords and businesses
We also work for property managers and facilities teams in Brentham Garden Suburb and across Greater London. Several sites can go on one quote.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. Our tips:
- Deal with leaking gutters that soak the joints below
- Keep movement joints as flexible joints, not mortar
- Do not let climbing plants root in the sealant
- Tell anyone working on the walls about the movement joints
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick which cost more to put right than the joint.
DIY sealant or a professional job?
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.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Surface by surface
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. We size the backing rod to the gap and keep the sealant to the right depth.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.
Honest limits
Before you book, it’s worth knowing the limits too:
- Adding movement joints to masonry that has none
- Structural movement, which needs a surveyor or engineer
- Damp that is not coming from the joint
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in Brentham Garden Suburb
- Copings & trims
- Render & cladding joints
- Façade panels
- Joints between brick and frames
- Brickwork movement joints
- Concrete & block
Walls and rooflines in Brentham Garden Suburb
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. With historic houses such as Pitzhanger Manor (about 1.1 miles south) nearby, there’s older building stock in the area around Brentham Garden Suburb 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.
For site and facilities teams at buildings such as St Gregory's Catholic Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. As a London address, Brentham Garden Suburb can be tricky for parking: let us know about parking bays, permits or a driveway. For an older house near a landmark such as Church of St Barnabas, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Brentham Garden Suburb is about 1 mile north of Ealing, in Greater London. Whether you’re in the middle of Brentham Garden Suburb or further out, external mastic is available for homes and businesses alike. We cover 764 towns and villages across Greater London, large and small. There’s also a page for London, about 9 miles away.
Our applicators cover all of the W5, W13 and UB6 postcode area for external mastic. Streets in the area include Kings Road, Selby Road and Marsh Road, and we cover them all. We also cover Pitshanger (1 mile west), Perivale (1 mile north-west), Ealing (1 mile south), Hanwell (2 miles south-west) and South Ealing (2 miles south). Larger places within reach include London (9 miles east), City of Westminster (7 miles east), Marylebone (7 miles east), Kensington (5 miles east), St Pancras (8 miles east) and Shoreditch (10 miles east).
What’s near Brentham Garden Suburb
We work in homes and buildings around Ealing Independent College, Library for Iranian Studies and St Benedict's School and the streets around them. Nearby too are Castle Bar Park (1 mile west) and Brentham Clubhouse pub (within half a mile north-west). For rail, the closest station is Ealing Broadway station, roughly 0.9 miles south. Well-known places in the area include London Transport Museum Depot (1.9 miles south-east) and Central Middlesex Hospital (1.7 miles east). Green spaces nearby include Castlebar Hill and Middle Lake.
How it works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. Most jobs take a few hours for a handful of joints, longer for a whole elevation. 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.
- 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.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any leaks or damp you’ve noticed
- Mention any sign-in or site rules at work premises
How to get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
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Towns and villages near Brentham Garden Suburb
Other services in Brentham Garden Suburb
What affects the cost of external mastic
The quote reflects the job in front of us. We look at:
- The number of rooms or windows
- Any mould that needs treating
- When we can work, for business premises
- Which sealant suits the joint
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
- Any previous sealing or DIY work
- The rough size of the job
We don’t publish a price list, because every job is different. Instead, we give you a clear price for your job. To arrange one, call 0345 464 0079 or drop us an email.