Slough · England
Middlegreen External Mastic
External mastic for Middlegreen, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Weeds or debris growing in open joints
- Failed sealant between panels on a façade
- Movement joints filled with mortar instead of sealant
Different surfaces, different methods
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. We size the backing rod to the gap.
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.
About our external mastic in Middlegreen
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, and when it fails, the wall takes the strain and water finds a way in. If you have brick movement joints where the sealant has split and panel joints letting water in, we can put it right, whatever the surface.
Somewhere as small as Middlegreen, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
Every job comes with a 12-month guarantee.
- Location
- Middlegreen (SL3)
- Wider area
- Slough
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Middlegreen: your questions answered
Do you work for landlords with property near Langley station?
Yes, we work for landlords and letting agents. You can phone 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before we start.
Do you cover smaller places like Middlegreen?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
Can you seal over the old sealant?
No, it won’t last. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Is the work guaranteed?
Yes. All our work carries our 12-month guarantee.
How long does the job take?
As a guide, most jobs take a few hours to a few days, depending on the length of joint and the access. Larger jobs naturally take longer, and we will tell you how long to expect.
How do you reach high-level joints?
That depends on how high the joints are and the ground below. Low-level joints are straightforward; for higher work, tell us about the building and we’ll confirm what’s needed.
What is backing rod for?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only, which would stop it stretching.
Leave it or put it right?
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost around the joint, so the damage spreads beyond the joint. Around Middlegreen, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
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, and we’ll explain the quote if you ask.
Why Middlegreen clients choose us
- Domestic, commercial and hotel work
- Arbo and Everbuild products
- Colour picked to suit the job
- A choice of colours where the product allows
Take a look at how sealant jobs are priced and customer reviews.
Walls and rooflines in Middlegreen
With historic houses such as Windsor Castle (about 2.8 miles south-west) nearby, there’s older building stock in the area around Middlegreen as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to St Mary the Virgin Church include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move. If you let a flat or house near Langley station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. For site and facilities teams at buildings such as The Langley Academy Primary, larger buildings have long runs of movement joint that eventually need resealing.
Middlegreen is about 2 miles east of Slough, in Slough. We carry out external mastic for householders, landlords and businesses in Middlegreen. Middlegreen is one of 31 places in Slough we cover for external mastic. There’s also a page for Reading, roughly 19 miles from Middlegreen.
Work in SL3 works the same way as everywhere else we cover. That includes homes and businesses on Laurel Avenue, St Mary's Road and Maryside. If you are just outside Middlegreen, we cover Langley (1 mile south-east), George Green (1 mile north), Shreding Green (1 mile north-east), Upton (2 miles west) and Wexham Court (2 miles north-west). Further out, we also cover Cippenham (4 miles west), Britwell (3 miles north-west), Burnham (5 miles west), Stoke Poges (3 miles north-west), Huntercombe (4 miles west) and Farnham Common (4 miles north-west).
Local landmarks in Middlegreen
Locally, jobs take us to homes and businesses close to Upton Court Grammar School, The Chestnuts pub and Langley Academy, among other places. For rail, the closest station is Langley station, roughly 0.7 miles east. Nearby you will also find Windsor Castle (2.8 miles south-west) and Museum of Eton Life (2.6 miles south-west). Not far away are Stoke Common.
Nearby places to Middlegreen
Other services in Middlegreen
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
If you are set on DIY, put the effort into 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.
Landlords, agents and businesses in Middlegreen
For anyone letting property in or around Middlegreen, several properties can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
What sealant work can’t fix
It helps to know what we can’t do:
- Structural movement, which needs a surveyor or engineer
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Failed render or damaged cladding panels
If you are not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Brickwork movement joints
- Façade panels
- Joints between brick and frames
- Copings & trims
- Concrete & block
- Render & cladding joints
Aftercare tips
After the cure time, these simple habits help:
- Point out the joints to other trades
- Wash walls gently around the sealant
- Walk round the building once a year and look at the joints
- Do not let climbing plants root in the sealant
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They must stay as flexible joints, never rendered or pointed over.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years.
How it works
Once we are on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes a few hours for a handful of joints, longer for a whole elevation. In a small place like Middlegreen, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Let us know about stairs, lifts or work at height
- Plan for the work area to be out of bounds to pets and children
Get a quote
Need a quote? Please ring 0345 464 0079 or email us with a few details. We will explain what we’d do and give you a clear price before any work starts.