Windsor and Maidenhead · England
External Mastic in Clewer
Problem with your movement joints in Clewer? We cut out the old, prepare the joints and apply the right sealant.
- Failed sealant between panels on a façade
- Failed seals between different materials
- Joints with sealant missing in places
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
About our external mastic in Clewer
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where a rigid filler would soon crack. We work on façade panels, concrete & block and brickwork movement joints, and common reasons people get in touch are joints pointed up with cement by mistake and movement joints with cracked, split or missing sealant.
In and around Clewer, older properties sit alongside newer ones, each with its own outside joints. Older homes need their gutter and trim joints kept tight, newer ones their movement joints.
Our work is backed for twelve months, in Clewer and everywhere else we cover.
- Location
- Clewer (SL4)
- Region
- Windsor and Maidenhead
- Cover
- One year on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
More services for Clewer
When to call us in Clewer
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
Any of these means the joints need attention:
- Movement joints with cracked, split or missing sealant
- Cracked joints where brick meets render or frames
- Weathered mastic that no longer stretches
- Failed sealant between panels on a façade
If you live in an older home near Church of St Andrew, an extension built onto an older house moves differently, and the joint between them takes the strain.
Before you book anyone
- Whether VAT is included
- What guarantee comes with the work
- What insurance they hold
- What the cure time is
What external mastic looks like in Clewer
Historic houses like Windsor Castle (about 1 mile east) are a reminder that the area around Clewer has older buildings as well as new. 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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Windsor & Eton Central station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Managing a site like St Edward's Catholic First School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Clewer is about 1 mile north of Windsor, in Windsor and Maidenhead. Homes, rented property, offices and hotels in Clewer can book us for external mastic. The work is guaranteed for a year. Across Windsor and Maidenhead, we cover 57 places, Clewer among them. There’s also a page for Reading, roughly 15 miles from Clewer.
All of SL4 is within our area for external mastic, from the main roads to the quietest streets. That includes homes and businesses on Oak Lane, Vale Road and Mill Lane and the roads around them. With the A308 and A332 close by, Clewer is easy for our applicators to reach for external mastic. If you are just outside Clewer, we cover Windsor (1 mile south), Eton (1 mile north-east), Eton Wick (1 mile north-west), Boveney (1 mile west) and Dedworth (1 mile south-west). We also work in nearby towns such as Maidenhead (5 miles north-west), Boyn Hill (5 miles west), North Ascot (5 miles south-west), Cookham (7 miles north-west), Furze Platt (6 miles north-west) and Broomhall (6 miles south).
Around Clewer
Typical jobs here are in homes near The Windsor Boys' School, The Windsor Boys' School and The Vansittart Arms and the streets around them. The closest station to Clewer is Windsor & Eton Central station, about 0.7 miles east of the centre. Nearby you’ll also find Museum of Antiquities (0.7 miles north-east) and King Edward VII Hospital (1 mile south-east). For a walk, there’s Taplow Lake and Bray Pit.
Leave it or put it right?
Resealing a run of joints in one go is generally better than patching one at a time. They’ve weathered the same way. In a smaller place like Clewer, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts.
Why us?
- Sealant colour chosen to suit
- You choose the colour before work begins
- Quality sealants from Arbo and Everbuild
- A choice of colours where the product allows
See what affects the cost and customer reviews.
Questions from Clewer
I let a flat near Windsor & Eton Central station. Can you help?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
Is Clewer in your area for external mastic?
Yes. Our work covers London and the South East, and Clewer is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Does someone need to be in?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that usually means someone at home.
Can a movement joint be filled with mortar?
No. A mortar-filled joint can’t move, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
How do I get a quote for external mastic in Clewer?
Size, access and the old material all affect the cost. Call for a quick quote.
Is there a guarantee?
Yes, for a year. If there’s a problem with our work in that time, tell us and we’ll put it right.
Where is Mr Mastic based?
We are based in Crawley, and we cover South East England, London and all of Scotland.
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Keep soil, plants and ivy away from the joints
- Point out the joints to other trades
- Walk round the building once a year and look at the joints
- Never let anyone fill a movement joint with mortar
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Resealing it early helps prevent that.
Honest limits
To be straight with you, some problems need a different trade:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Render that’s blown, hollow or coming away
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly.
What we seal
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Brickwork movement joints
- Façade panels
- Copings & trims
How we quote for external mastic
Your quote is based on your job. We take into account:
- The old material and how stubborn it is
- The number and length of the joints
- Any working-time requirements on site
- How easy the joints are to reach
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or email us and we will talk you through it.
What we need to know
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- How we’d reach the joints
- A few pictures by email, if you can
- Roughly how big the job is
- Whether it has been sealed before
Every job is quoted individually, so start by telling us what you need. Simply ring 0345 464 0079 or send us an email and describe the job and send photos if you have them.
How the visit works
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours to a few days, depending on the length of joint and the access. Parking around Clewer is usually easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- 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.
How to prepare
- Let us know about earlier repairs to the joints
- Move anything stored near the joints
- Mention any tricky access
Ask for a quote
Need a quote? Please ring 0345 464 0079 or drop us an email with a few details. We’ll explain what we’d do and give you a clear quote before any work starts.