Greater London · England
External & façade joints in Hayes, Greater London
External mastic for Hayes, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Sealant that has lost its bond to the brick or render
- Old sealant gone brittle and cracked
- Failed seals between different materials
External mastic for homes and businesses in Hayes
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. We work on joints between brick and frames, brickwork movement joints and copings & trims, and people most often call us about hard, crazed mastic that has stopped moving and panel joints letting water in.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Hayes, tell us how high the joints are and how to reach the back of the building.
We stand behind the work with a one-year guarantee, so you are covered after we’ve gone.
- Location
- Hayes (UB3, UB4, UB8, UB10)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Outside joints around Hayes
With historic houses such as Northolt Manor (about 3 miles north-east) nearby, there’s older building stock in the area around Hayes as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In the older streets around Church of St Mary, the joints between older walls, newer extensions and the roofline need a sealant that can move. Hayes is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Hayes is about 8 miles east of Slough, in Greater London. From the centre of Hayes to the outskirts, we cover external mastic for every kind of property. Hayes is one of 764 towns and villages in Greater London where we work. You can also see our page for London, roughly 14 miles from Hayes.
All of UB3, UB4, UB8 and UB10 is within our area for external mastic. If you need external mastic at a property on Church Road, Drenon Square and Townfield Square or anywhere close by, we can help. Hayes sits on or near the A312. We also cover Hillingdon (2 miles north-west), Yiewsley (2 miles west), West Drayton (2 miles west), Cowley (3 miles west) and Uxbridge (3 miles north-west). Larger places within reach include London (14 miles east), City of Westminster (12 miles east), Marylebone (12 miles east), Kensington (9 miles east), St Pancras (13 miles east) and Shoreditch (15 miles east).
Landmarks near Hayes
Around Hayes, our work takes us to homes and buildings near Dr Triplett's CofE Primary School, Rosedale College and Barra Hall Park, among other places. For rail, the closest station is Hayes & Harlington station, about 0.9 miles south. Other landmarks nearby include Hillingdon Museum and Archives Services (3.2 miles north-west) and Hayes Cottage Hospital (under half a mile north). Not far away are Middle Lake and Yeading Brook Meadows.
Signs you need external mastic in Hayes
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
The most common problems we see are:
- Leaking joints around cladding and façade panels
- Hard, crazed mastic that has stopped moving
- Cracked joints where brick meets render or frames
- Joints where the bead has come unstuck
If you let a flat or house near Hayes & Harlington station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Questions to ask before booking
- Whether they’re fully insured
- Whether all the old sealant comes out first
- What the quote includes, VAT included or not
- Which sealant they’ll use, and why
Hayes questions
Is Hayes in your area for external mastic?
Yes, Hayes 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.
Can parking be tricky for a visit in Hayes?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Are you fully insured?
Yes, we are fully insured for domestic and commercial work.
Can you reach joints on upper floors?
Each building is different. Send us pictures and a rough idea of the height.
Why do you put foam in the joint first?
Backing rod controls the sealant depth and keeps it off the back of the joint. That way it bonds to the two sides only and can stretch.
Is there a guarantee?
Yes, always. Each job is guaranteed for twelve months.
Do you do commercial work?
Yes. We can plan bigger jobs in stages.
The process
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes a few hours for a handful of joints, longer for a whole elevation from start to finish. In a London area like Hayes, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Move anything stored near the joints
- Let us know if you’ve seen damp or leaks
- Mention any parking rules near the property
Getting a quote
There’s no standard price list. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or drop us an email.
Read more
Towns and villages near Hayes
What else we do in Hayes
Aftercare tips
After the cure time, these simple habits help:
- Show decorators and builders where the movement joints are
- Walk round the building once a year and look at the joints
- Keep soil, plants and ivy away from the joints
- Keep high-pressure jets off the joints
Avoid pressure-washing straight into the joints. A strong jet can damage the edges of the bead and let water in behind.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years, so it’s worth resealing at the first signs.
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
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 does not work out, we can still put it right.
Why deal with it now?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Hayes, the repair is bigger than the sealant job would have been.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Why us?
- ARBOMaster approved applicator
- Arbo and Everbuild products
- Any old sealant cut out fully, not covered over
- You choose the colour before work begins
Take a look at our cost guide and customer reviews.
Surface by surface
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. That movement goes into the joint, so its sealant has to stay flexible.
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.