Greater London · England
External Mastic in Brook Green
External mastic across Brook Green and nearby, with old sealant always removed completely and a 12-month guarantee.
- Gaps where render, brick and frames meet
- Brick movement joints where the sealant has split
- Moss and dirt in joints with no sealant left
How we handle external mastic in Brook Green
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing, and we don’t skip that step. If you are dealing with brick movement joints where the sealant has split and joints pointed up with cement by mistake, we can put it right.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. In Brook Green, joints up high may need ladders or other access, which is worth talking through when you book.
You’re covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or email us.
- Where
- Brook Green (W6, W14, W12)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
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 sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Different surfaces, different methods
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. A primer goes on where the product requires one before the bead.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so its sealant has to stay flexible.
What happens if it’s left?
A failed movement joint lets water into the wall, behind render and cladding. Dealing with it early keeps the repair to the joint, instead of the wall and finishes around it. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Brook Green, the repair is bigger than a sealant job.
The cost reflects the work involved, not guesswork. That’s why we ask about the job first and agree the price before starting.
Why choose Mr Mastic in Brook Green
- A sealant colour to suit the surroundings
- A 12-month guarantee on all work
- Trusted Arbo and Everbuild sealants
- We never seal over old sealant
Read our cost guide and our reviews.
FAQs for Brook Green
Do you cover Brook Green for external mastic?
Yes. We work across London and the South East, and Brook Green is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing.
Is parking a problem for a job in Brook Green?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Why do you put foam in the joint first?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
How long before the joint can be used?
Cure times vary by product. Before we leave, we’ll tell you the cure time.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages to suit the site.
Do you take out the old sealant first?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Do you work at height?
That depends on the building and the joints. We work on joints that can be reached safely. Tell us about the building and we will confirm what access is needed.
Can you quote for more than one area?
Yes. More than one area can go on one quote.
The process
When we arrive, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before work begins. Most jobs take a few hours for a handful of joints, longer for a whole elevation. For a job in Brook Green, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First, the joints are inspected and the access agreed.
- 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.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Let us know about earlier repairs to the joints
- Keep children and pets away from the work area
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Related advice
Towns and villages near Brook Green
Also in Brook Green
What we are called out for in Brook Green
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.
The most common problems we see are:
- Water getting into walls through failed joints
- Cracked joints where brick meets render or frames
- Movement joints filled with mortar instead of sealant
- Failed sealant between panels on a façade
If you let a flat or house near Kensington Olympia station, split movement joints are easy to miss on a rental until damp shows inside.
What your quote should include
- Whether they’re fully insured
- How the surfaces are prepared before sealing
- Which sealant they’ll use, and why
- What the quote includes, VAT included or not
When it isn’t the sealant
Sealant isn’t the answer to every problem, and we’d rather say so up front. It will not solve:
- Structural movement, which needs a surveyor or engineer
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Failed render or damaged cladding panels
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before booking.
Surfaces we seal
- Joints between brick and frames
- Concrete & block
- Brickwork movement joints
- Render & cladding joints
- Façade panels
- Copings & trims
Landlord and commercial work in Brook Green
We also work for property managers and facilities teams. We can quote a run of properties together, and we are fully insured for the work.
If you manage several properties in or around Brook Green, several properties can be quoted together. Just tell us the addresses and what each one needs.
What external mastic looks like in Brook Green
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
In the older streets around The Parish Church of Saint Mary, older walls, gutters and the joints where extensions meet them need a flexible sealant. For site and facilities teams at buildings such as Larmenier & Sacred Heart Catholic Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Brook Green is about 1 mile west of Kensington, in Greater London. Wherever you are in the W6 postcode area, we cover external mastic for homes and businesses. Brook Green is one of 764 towns and villages in Greater London we cover for external mastic.
Work in W6, W14 and W12 is quoted and booked the same way as anywhere else. If you need external mastic at a property on Adie Road, Rowan Road and Anley Road or anywhere close by, we can help. Other places close to Brook Green include Hammersmith (1 mile west), Brackenbury Village (1 mile west), North End (1 mile south-east), West Kensington (1 mile south-east) and Fulham (1 mile south-east). Larger places within reach include London (5 miles east), City of Westminster (3 miles north-east), Marylebone (3 miles north-east), St Pancras (5 miles north-east), Shoreditch (6 miles east) and Walthamstow (11 miles north-east).
What’s near Brook Green
In Brook Green, that means homes and buildings near Queen's Head pub, Sacred Heart High School and Polish Library POSK in London. Nearby too are Corona Theatre School (0.6 miles west) and St Paul's Gardens (under half a mile south-east). The closest station to Brook Green is Kensington Olympia station, roughly 0.5 miles east of the centre. A little further out are Culture House (0.6 miles north) and Hammersmith Broadway (within half a mile south-west). Not far away are WWT London Wetland Centre and Campden Hill.