Greater London · England
Old Chiswick External Mastic
Professional external mastic in and around Old Chiswick, with old sealant always removed completely.
- Joints pointed up with cement by mistake
- Brick movement joints where the sealant has split
- Leaking joints around cladding and façade panels
How we handle external mastic in Old Chiswick
Low-level joints can normally be done from the ground. For joints higher up, give us some details of the building and we will confirm what’s needed to reach them safely. We’re often asked to deal with joints with sealant missing in places and moss and dirt in joints with no sealant left, across copings & trims, façade panels and brickwork movement joints.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Old Chiswick, tell us how high the joints are and how to reach the back of the building.
You are covered for a year from the day we finish. If anything isn’t right with it, phone 0345 464 0079 or send us an email.
- Where
- Old Chiswick (W4, SW13, W6)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How the job changes by surface
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible in all weathers.
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.
What we do, step by step
There isn’t much for you to do on the day. Point us to the joints and we will get on with it. The job generally takes anything from a few hours to several days, depending on the building, including the tidy-up. In Old Chiswick, 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.
- 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
- Try not to wet indoor joints just before the visit
- Tell us about any previous sealing or DIY attempts
- Mention any sign-in or site rules at work premises
Ask for a quote
Getting a quote is simple: let us know the job and the location. Photos by email help us understand the job.
Read more
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
When something else is needed
New sealant cannot fix everything, and we’d rather say so up front. It won’t solve:
- Walls that need new movement joints cut into them
- Failed render or damaged cladding panels
- Rising or penetrating damp from elsewhere in the wall
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Copings & trims
- Façade panels
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
Towns and villages near Old Chiswick
Also in Old Chiswick
Outside joints around Old Chiswick
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 Hogarth's House (about 0.4 miles west) nearby, there’s older building stock in the area around Old Chiswick as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
If you live in an older home near St. Nicholas Church, older walls, gutters and the joints where extensions meet them need a flexible sealant. Old Chiswick is in London, so parking needs planning: let us know about parking bays, permits or a driveway. For site and facilities teams at buildings such as The William Hogarth Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Old Chiswick is about 2 miles south of Acton, in Greater London. We carry out external mastic for householders, landlords and businesses in Old Chiswick and nearby, as part of our work across Greater London. Old Chiswick is one of 764 towns and villages in Greater London where we work. There’s also a page for London, about 7 miles away.
Our applicators cover all of W4, SW13 and W6 for external mastic. That includes homes and businesses on Short Road, Quick Road and Paxton Road and the roads around them. If you are just outside Old Chiswick, we cover Turnham Green (1 mile west), Chiswick (1 mile north-west), Grove Park (1 mile west), Barnes (1 mile south) and Hammersmith (1 mile north-east). Further out, we also cover London (7 miles east), City of Westminster (5 miles north-east), Marylebone (5 miles north-east), St Pancras (6 miles north-east), Shoreditch (8 miles east) and Walthamstow (12 miles north-east).
Local landmarks in Old Chiswick
We work in homes and buildings around George and Devonshire pub, The Swedish School and Polish Library POSK in London. Other local landmarks include Turnham Green (0.8 miles north-west) and Chiswick School (0.5 miles south-west). For rail, the closest station is Chiswick station, roughly 0.8 miles south-west. Well-known places in the area include Kurdish Museum Library and Archive (0.7 miles north-east) and West London Hospital (1.3 miles east). For a walk, there’s Campden Hill and Kew Gardens Lake.
Leave it or put it right?
Sealing over the top of old mastic doesn’t hold for long. New sealant doesn’t bond well to old, weathered sealant, so we always take the old sealant out. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble for homes in Old Chiswick.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, ring 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
What you get with us
- An ARBOMaster approved applicator
- Any old sealant cut out fully, not covered over
- A 12-month guarantee on all work
- White, clear, grey or another colour, product permitting
See what affects the cost and our reviews.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Keep high-pressure jets off the joints
- Check the sealant is paintable before painting near it
- Make sure movement joints are not pointed over
- Walk round the building once a year and look at the joints
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead.
Small splits are the time to act. At that stage it’s a simple cut out and reseal before water has had years to get in.
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Common questions in Old Chiswick
Is parking an issue for external mastic in Old Chiswick?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Do you work for landlords with property near Chiswick station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Can you match the colour of my brickwork?
We choose a sealant colour to suit the brick, stone or render so the joint blends in. There’s a wide choice of exterior colours.
Do you work for hotels and businesses?
Yes. We can plan bigger jobs in stages to suit the site.
Do you have insurance?
Yes. We are fully insured.
What’s an expansion joint in brickwork?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Is it worth trying it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.