Greater London · England
External & façade joints in Yiewsley, Greater London
Problem with your movement joints in Yiewsley? We remove the old material, prepare the joints and seal them properly.
- Movement joints filled with mortar instead of sealant
- Gaps where render, brick and frames meet
- Weeds or debris growing in open joints
How we handle external mastic in Yiewsley
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall so the line blends in. We are often asked to deal with joints pointed up with cement by mistake and sealant that has lost its bond to the brick or render, on joints between brick and frames, copings & trims and façade panels.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. For a home in Yiewsley, tell us how high the joints are and how to reach the back of the building.
Each job carries a 12-month guarantee.
- Location
- Yiewsley (UB7, UB8)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What happens on the day
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. After a quick look at the joints together, the area is protected and the work begins. 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. Mention any building rules, key holders or managing agents when you book.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Tell us about any previous sealing or DIY attempts
- Mention any parking rules near the property
Getting a quote
Want a quote for external mastic? Please ring 0345 464 0079 or email us and tell us about the job. We’ll explain what we’d do and give you a clear price before we start.
Advice
Leave it or put it right?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Yiewsley, the repair is bigger than a sealant job.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
Why Yiewsley customers choose us
- One-year guarantee on every job
- You choose the colour before work begins
- Any old sealant cut out fully, not covered over
- We’re fully insured
Take a look at our cost guide or what customers say.
Yiewsley buildings and the weather
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
Homes close to St Matthew's include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain. For site and facilities teams at buildings such as Rabbsfarm Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Yiewsley is about 2 miles south-west of Hillingdon, in Greater London. Wherever you are in the UB7 postcode area, our applicators can take on external mastic. 764 places in Greater London are on our list. We also work in London, about 16 miles from Yiewsley.
Postcode districts we cover here for external mastic: UB7 and UB8. Streets in the area include High Street, Castle Avenue and Kingston Avenue. Being close to the A408, Yiewsley is simple for us to get to. If you’re just outside Yiewsley, we cover West Drayton (1 mile south), Cowley (1 mile north-west), Thorney (1 mile south-west), Hillingdon (2 miles north-east) and Uxbridge (2 miles north). Larger places within reach include City of Westminster (13 miles east), Marylebone (14 miles east), Kensington (11 miles east), St Pancras (15 miles east), Hampstead (13 miles east) and Ruislip (5 miles north-east).
What’s near Yiewsley
Locally, jobs take us to homes and businesses close to Stockley Academy, Lake Farm Country Park and George and Dragon pub, among other places. For rail, the closest station is West Drayton station, about 0.5 miles south-west of the centre. Nearby you will also find Hillingdon Hospital (0.7 miles north) and The Chimes (2.1 miles north). Green spaces nearby include Uxbridge Moor and Staines Reservoirs.
Do you need external mastic in Yiewsley?
Sunlight, wet weather and frost wear exterior sealant down. Over the years it hardens, cracks on the surface and loses its give, so the joint eventually tears or comes away from one side.
If you can see any of these, it’s time to have the joints looked at:
- Water getting into walls through failed joints
- Joints with sealant missing in places
- Gaps where render, brick and frames meet
- Moss and dirt in joints with no sealant left
Yiewsley is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
What your quote should include
- How hidden problems are handled
- Who turns up on the day
- Is the old sealant removed completely?
- What product goes in the joint
How we quote for external mastic
Every job gets its own quote. These are the things that affect it:
- The old material and how stubborn it is
- Working hours on commercial sites
- How much there is to do
- Whether there’s mould to deal with
Combining jobs into one visit generally makes better use of the time than several visits. You’ll get one clear quote for the whole job.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- A few pictures by email, if you can
- Whether it’s a home or a business
- What the problem is, such as mould, gaps, leaks or cracking
- Roughly how big the job is
Asking for a quote is easy: let us know the job and the location. A few photos by email make the job easier to understand, and we will take it from there.
Can I do it myself?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Also near Yiewsley
Other services in Yiewsley
Aftercare tips
Good habits help new joints last longer. Our tips:
- Clear growth from the base of walls and joints
- Keep water from gutters off the wall
- Keep movement joints as flexible joints, not mortar
- Wash walls gently around the sealant
Look over the joints once a year, ideally after winter. Watch for splits, edges coming away or growth in the joint.
A joint that has stopped moving pushes the movement elsewhere, generally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
Yiewsley: your questions answered
Is parking a problem for a job in Yiewsley?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Do you cover Yiewsley for external mastic?
Yes, Yiewsley is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Will the new joint stand out?
We aim for a joint that suits the wall rather than one that jumps out. Colour is agreed with you before we begin.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Yiewsley, along with the rest of our area.
Will there be a smell?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
Is it messy?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Landlords, agents and businesses in Yiewsley
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.