Windsor and Maidenhead · England
External & façade joints in Boyn Hill, Windsor and Maidenhead
Sealing brickwork movement joints, render, cladding and façade joints in Boyn Hill, with a 12-month guarantee on every job. Ask us for a quote.
- Failed sealant between panels on a façade
- Moss and dirt in joints with no sealant left
- Water getting into walls through failed joints
External mastic for homes and businesses in Boyn Hill
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We strip the joint back and start again. We work on brickwork movement joints, façade panels and concrete & block, and people most often call us about movement joints with cracked, split or missing sealant and damp patches traced to an open external joint.
In and around Boyn Hill, 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.
A 12-month guarantee comes as standard, so you’re covered after we have gone.
- Location
- Boyn Hill (SL6)
- Region
- Windsor and Maidenhead
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How the job changes by surface
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. They’re resealed over backing rod with a low-modulus sealant in a colour to suit the brick.
Boyn Hill questions
I let a flat near Maidenhead station. Can you help?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.
Is Boyn Hill in your area for external mastic?
Yes. Our work covers London and the South East, and Boyn Hill is part of that. Just phone 0345 464 0079 or email us with a few details of the job.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so the joint between them must be flexible. We choose one that suits both surfaces.
What is backing rod for?
Backing rod controls the sealant depth and keeps it off the back of the joint. Then the sealant bonds to two faces and can move.
Is there a guarantee?
Yes: twelve months. If anything is not right with the work within the year, let us know and we will sort it.
How often do external joints need resealing?
It varies with how exposed the wall is and how much the joint moves. Look for splits, hardening or edges coming away, and reseal at that point.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status.
Where is Mr Mastic based?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
The process
On the day, we start by going over the job with you. Surfaces next to the work are protected before work begins. Most jobs take anything from a few hours to several days, depending on the building. A visit to Boyn Hill is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- First, the joints are inspected and the access agreed.
- 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.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Mention any tricky access
- Mention if the joints have been sealed before
- Tell us about any water getting in
Ask for a quote
Every job is quoted individually. Just ring 0345 464 0079 or email us with the details and send photos if you have them.
Advice
When something else is needed
A few problems are outside what sealant work can do:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Render that’s blown, hollow or coming away
- Movement that’s more than a sealant joint can take
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Surfaces we seal
- Façade panels
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Brickwork movement joints
DIY sealant or a professional job?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Walls and rooflines in Boyn Hill
With historic houses such as Dorney Court (about 3.1 miles east) nearby, there’s older building stock in the area around Boyn Hill as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. 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.
Schools such as Larchfield Primary and Nursery School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. For landlords with property near Maidenhead station, outside joints that have cracked can let damp into a rental, so check them between lets.
Boyn Hill is about 1 mile south-west of Maidenhead, in Windsor and Maidenhead. Our applicators cover external mastic for homeowners, landlords and businesses in Boyn Hill and the surrounding area. Our area takes in 57 places across Windsor and Maidenhead, large and small. You can also see our page for Reading, about 11 miles away.
All of SL6 is within our area for external mastic. If you need external mastic at a property on Lock Lane, Ross Road and Curls Road or anywhere close by, our applicators can take on the job. With the A404(M) close by, Boyn Hill is simple for us to get to for external mastic. Neighbouring places we cover for external mastic include Cox Green (1 mile south-west), Maidenhead (1 mile north-east), Bray Wick (1 mile south-east), Woolley Green (1 mile west) and Pinkneys Green (2 miles north-west). Larger places within reach include Windsor (5 miles south-east), North Ascot (7 miles south), Cookham (3 miles north), Dedworth (5 miles south-east), Broomhall (9 miles south-east) and South Ascot (8 miles south). Boyn Hill is one of the larger places we cover in Windsor and Maidenhead.
Local landmarks in Boyn Hill
In Boyn Hill, that means homes and buildings near Ockwells Park, Altwood CofE Secondary School and The Crown pub, among other places. The closest station to Boyn Hill is Maidenhead station, about 1 mile north-east of the centre. Nearby you will also find The Reitlinger Bequest Museum (1.8 miles north-east) and St Mark's Hospital (1 mile north). Open spaces near Boyn Hill include Weycock Hill and The Gullet Local Nature Reserve.
Places near Boyn Hill
What else we do in Boyn Hill
Quotes for external mastic in Boyn Hill
There’s no set price list. The quote depends on:
- The old material and how stubborn it is
- The number and length of the joints
- Whether the work is at height
- The product the joint needs
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or drop us an email.
Asking for a quote
There’s no need for technical detail. Just tell us:
- How many joints, rooms or windows are involved
- Any access issues, like height or stairs
- The address or postcode of the job
- Pictures of the joints, sent by email
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved before giving you a price.
When to call us in Boyn Hill
Some movement joints have been pointed up with mortar by mistake. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Most people get in touch after spotting one of these:
- Brick movement joints where the sealant has split
- Water getting into walls through failed joints
- Movement joints filled with mortar instead of sealant
- Sealant pulling away from one side of the joint
Homes close to All Saints' Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
What your quote should include
- How long to leave it before use
- What product goes in the joint
- What guarantee comes with the work
- Whether all the old sealant comes out first
Why act early in Boyn Hill
Sealing over the top of old mastic doesn’t hold for long. New sealant does not bond well to old, weathered sealant, so the old joint is cut out fully first. In a smaller place like Boyn Hill, 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.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are 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.
Why choose Mr Mastic in Boyn Hill
- We’re fully insured
- We agree the colour with you first
- Sanitary silicone with an anti-fungal additive in wet areas
- 180+ five-star Google reviews
See our cost guide or what customers say.