Surrey · England
Sidlow External Mastic
Professional external mastic in and around Sidlow, with old sealant always removed completely.
- Hard, crazed mastic that has stopped moving
- Rain getting behind render or cladding at a joint
- Movement joints with cracked, split or missing sealant
External mastic for homes and businesses in Sidlow
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. We work on façade panels, concrete & block and copings & trims, and people most often call us about weeds or debris growing in open joints and rain getting behind render or cladding at a joint.
Around Sidlow, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points.
Each job carries a 12-month guarantee.
- Location
- Sidlow (RH2)
- Region
- Surrey
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Sidlow questions
Do you work for landlords with property near Salfords station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear quote.
Do you cover smaller places like Sidlow?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Sidlow and the rest of Surrey, along with the rest of our area.
Do you take out the old sealant first?
Yes, every time. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
What is backing rod for?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides so it can flex with the joint.
Is it messy?
Very little: the area around the joints is protected first, and we tidy up before we go.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Is the work guaranteed?
Yes. All our work carries our one-year guarantee.
Quotes for external mastic in Sidlow
The price is agreed before any work begins. It’s based on:
- The old material and how stubborn it is
- Access and height
- How many areas need sealing
- Which sealant suits the joint
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and agree the price before starting.
Asking for a quote
When you call or email, it’s useful to know:
- Any previous sealing or DIY work
- The address or postcode of the job
- What’s wrong with the joints now
- Whether it’s a home or a business
We do not publish a price list. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or drop us an email.
When to call us in Sidlow
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it can’t stretch and rips as the joint opens.
Common reasons people contact us include:
- Failed seals between different materials
- Movement joints with cracked, split or missing sealant
- Plants rooting in failed movement joints
- Joints where the bead has come unstuck
Rented homes near Salfords station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- How the surfaces are prepared before sealing
- Whether the sealant suits the joint
- Who turns up on the day
- Whether all the old sealant comes out first
What the job involves on each surface
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so its sealant has to stay flexible.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. We cut out the old sealant and reseal with a product suited to both surfaces.
Landlord and commercial work in Sidlow
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Should I try it myself first?
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 does not work out, we can still put it right.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Why act early in Sidlow
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and does not last. Where a wall is exposed, as many are in small places like Sidlow, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why book with us
- Any old sealant cut out fully, not covered over
- A sealant colour to suit the surroundings
- 20+ years of sealant experience
- Sanitary silicone with an anti-fungal additive in wet areas
Read our cost guide or our reviews.
How it works
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take a few hours to a few days, depending on the length of joint and the access. In a small place like Sidlow, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- For business premises, tell us about site rules or sign-in
- Let us know about earlier repairs to the joints
Get a quote
We quote each job on its own, so start by telling us what you need. Simply ring 0345 464 0079 or drop us an email and describe the job and send photos if you have them.
Related advice
Nearby places to Sidlow
Other services in Sidlow
External mastic in Sidlow: local notes
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as Dovers Green School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. Homes close to Emmanuel Church include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Sidlow is about 2 miles south of Reigate, in Surrey. Whether you’re in the middle of Sidlow or further out, external mastic is available for homes and businesses alike. Sidlow is one of 395 places in Surrey where we work for external mastic. You can also see our page for Crawley, roughly 7 miles from Sidlow.
We cover every part of the RH2 postcode area for external mastic and the streets around it. We also cover Irons Bottom (1 mile south-west), South Park (1 mile north), Leigh (2 miles west), Reigate (2 miles north) and Dawesgreen (2 miles west). Within a short drive, we also cover Epsom (9 miles north), Redhill (3 miles north-east), Ewell (10 miles north), Walton-on-Thames (15 miles north-west), Caterham (7 miles north-east) and Dorking (6 miles west).
Near you in Sidlow
In Sidlow, that means homes and buildings near Earlswood Common, Reigate School and Burys Court School. The nearest railway station is Salfords station, about 1.8 miles east of the centre. A little further out are Reigate Priory Museum (2 miles north) and East Surrey Hospital (1.8 miles north-east). For a walk, there’s Colley Hill and Reigate Heath.