Greater London · England
External & façade joints in Yiewsley, Greater London
Movement joints in Yiewsley need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Water getting into walls through failed joints
- Hard, crazed mastic that has stopped moving
- Movement joints filled with mortar instead of sealant
External mastic in Yiewsley
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. If you have sealant that has lost its bond to the brick or render and movement joints with cracked, split or missing sealant, we can put it right, whatever the surface.
Outside work in London starts with access: side passages, upper floors and where to park. In Yiewsley, joints up high may need ladders or other access, which is worth talking through when you book.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Yiewsley (UB5, UB4, UB1)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Landlords, agents and businesses in Yiewsley
If you manage several properties in or around Yiewsley, several properties can be quoted together. Send us the addresses and the work at each.
In hotels, rooms out of use cost money, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
Common questions in Yiewsley
Can you do external mastic in Yiewsley?
Yes, Yiewsley is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or send us an email and tell us what needs doing.
Can you help a landlord with a rental near Southall station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Can I add another job to the visit?
Yes, and it often makes sense. Doing several areas at once is usually more efficient.
What should I tell you?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply call 0345 464 0079 or send us an email.
Can you reach joints on upper floors?
That depends on how high the joints are and the ground below. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Yiewsley.
When will the joints need doing again?
It varies from wall to wall: joints on exposed walls or with a lot of movement age sooner. Check them each year and reseal when they split or harden. Our work comes with a 12-month guarantee.
Do you use backing rod?
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.
Walls and rooflines in Yiewsley
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Northolt Manor (about 1.4 miles north-east) nearby, there’s older building stock in the area around Yiewsley as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
As a London address, Yiewsley can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Schools such as Brookside Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Yiewsley is about 2 miles north-east of Hayes, in Greater London. Whether you are in the middle of Yiewsley or further out, we cover external mastic for every kind of property. 764 places in Greater London are on our list, from the larger towns to small villages. We also work in London, around 13 miles away.
Jobs for external mastic in UB5, UB4 and UB1 works the same way as everywhere else we cover. External mastic is available to properties on Owen Road, Friar Road and Maple Road and the roads around them. Neighbouring places we cover for external mastic include Yeading (1 mile north), Dormers Wells (2 miles south-east), Northolt (2 miles north-east), Southall (2 miles south) and South Ruislip (2 miles north). Further out, we also cover London (13 miles east), City of Westminster (10 miles east), Marylebone (11 miles east), Kensington (8 miles east), St Pancras (12 miles east) and Shoreditch (13 miles east).
Near you in Yiewsley
We work in homes and buildings around White Hart Public House, Northala Fields and Barnhill Community High School, among other places. The nearest railway station is Southall station, roughly 1.8 miles south. A little further out are Hayes Cottage Hospital (1.5 miles south-west) and The Chimes (3.8 miles west). The countryside around Yiewsley includes Northala Fields and Yeading Brook Meadows.
What sealant work cannot fix
Some problems need a builder, plumber or other trade rather than us:
- Cracked brickwork or render that needs a builder or plasterer
- Subsidence or other structural problems
- Render that’s blown, hollow or coming away
If you’re not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer.
Where we work in Yiewsley
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
- Façade panels
- Render & cladding joints
- Concrete & block
Keeping the joints in good condition
How long the joints last depends on use and care. We suggest:
- Check the sealant is paintable before painting near it
- Do not let climbing plants root in the sealant
- Wash walls gently around the sealant
- Keep water from gutters off the wall
Keep the joints clear of soil, plants and climbing growth. 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.
How the visit works
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours to a few days, depending on the length of joint and the access. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Tell us about any water getting in
- Keep pets and children clear of the area while we work
- For business premises, tell us about site rules or sign-in
Getting a quote
We quote each job on its own. Just call 0345 464 0079 or send us an email with the details.
Related advice
What affects the cost of external mastic
Jobs vary more than people expect. What affects the quote:
- Whether there’s mould to deal with
- The type of sealant required
- The number and length of the joints
- How many areas need sealing
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- Roughly how big the job is
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
- Access, such as stairs, a lift or height
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
When to call us in Yiewsley
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. The joint can’t move, so the wall cracks somewhere else instead.
People normally contact us after spotting one of these:
- Leaking joints around cladding and façade panels
- Joints where the bead has come unstuck
- Damp patches traced to an open external joint
- Joints with sealant missing in places
In the older streets around St Joseph the Worker & Dovetail Centre, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Before you book anyone
- How much experience the applicator has
- The length of the guarantee
- What product goes in the joint
- Whether they’re fully insured
Places near Yiewsley
What else we do in Yiewsley
DIY sealant or a professional job?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.