Surrey · England
Hersham External Mastic
Our applicators work in Hersham on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Weathered mastic that no longer stretches
- Weeds or debris growing in open joints
- Joints pointed up with cement by mistake
External mastic in Hersham: local notes
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. With historic houses such as The Homewood (about 1.4 miles south-east) nearby, there’s older building stock in the area around Hersham as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
For landlords with property near Walton-On-Thames station, split movement joints are easy to miss on a rental until damp shows inside. If you live in an older home near Church of St Peter, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Hersham is about 1 mile south of Walton-on-Thames, in Surrey. Every kind of property in Hersham can book us for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. 395 places in Surrey are on our list, from the larger towns to small villages. London is on our list too, about 16 miles from Hersham.
Work in KT12 is quoted and booked the same way as anywhere else. Whether your property is on Police Station Road, Queensway South and Queensway or anywhere close by, we can help. Hersham is on the A244, so it’s easy for us to get to with everything needed for external mastic. Nearby, we also carry out external mastic in Burwood Park (1 mile south-west), Walton-on-Thames (1 mile north), Whiteley Village (2 miles south-west), St George's Hill (2 miles west) and Weybridge (2 miles west). We also work in nearby towns such as Guildford (11 miles south-west), Woking (8 miles south-west), Camberley (14 miles west), Epsom (6 miles east), Redhill (14 miles south-east) and Ewell (6 miles east).
Landmarks near Hersham
We work in homes and buildings around The Barley Mow Public House, West End Common and Three Rivers Academy and the streets around them. The nearest railway station is Walton-On-Thames station, about 0.6 miles north-west. Nearby you’ll also find No. 2 New Zealand General Hospital (1.6 miles north-west) and Chessington Castle Hill (4.8 miles east). Not far away are Claremont Lake and Jubilee Wood.
External mastic for homes and businesses in Hersham
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two. If you’re dealing with gaps where render, brick and frames meet and panel joints letting water in, we can help, on concrete & block, copings & trims and joints between brick and frames alike.
Houses in smaller places like Hersham can stand more in the open than those in a built-up town, so exposed walls and rooflines take more wind-driven rain. Joints on those sides are usually the first to go.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Where
- Hersham (KT12)
- Region
- Surrey
- Cover
- One year on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
Once we’re on site, we check the joints match what you told us. 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 Hersham is generally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- We start by walking round the building and agreeing the joints and the access.
- 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.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Mention any parking rules near the property
- Let us know about stairs, lifts or work at height
- For business premises, tell us about site rules or sign-in
Getting a quote
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job.
Read more
For landlords and businesses
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
DIY versus a professional finish
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
What the job involves on each surface
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. Each joint gets a sealant that suits the panel and its movement.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
Signs you need external mastic in Hersham
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 cannot stretch and rips as the joint opens.
Keep an eye out for these signs:
- Joints pointed up with cement by mistake
- Cracked joints where brick meets render or frames
- Weeds or debris growing in open joints
- Joints with sealant missing in places
For site and facilities teams at buildings such as Bell Farm Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Before booking anyone
- Whether you can choose the colour
- Whether all the old sealant comes out first
- How the surfaces are prepared before sealing
- How long the guarantee is
What happens if it’s left?
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render, so the damage spreads beyond the joint. Around Hersham, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
Why book with us
- Trusted Arbo and Everbuild sealants
- We agree the colour with you first
- A sealant colour to suit the surroundings
- Experience in homes, commercial sites and hotels
Hersham: your questions answered
Can you help a landlord with a rental near Walton-On-Thames station?
Yes. We work for landlords and agents as well as householders, and several properties can go on one quote. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Can you do external mastic in Hersham?
Yes. We work across London and the South East, and Hersham is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us and we are fully insured.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year.
Can you match the colour of my brickwork?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We pick the one that suits your wall best so it does not stand out.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Do you use backing rod?
We fit closed-cell backing rod wherever the joint depth needs controlling. It sets the sealant depth and prevents three-sided bonding.
Do I have to be there?
That depends on where the joints are. Inside work needs someone to give us access, and for outside work we will agree access with you when we book.
What affects the quote in Hersham
Every job gets its own quote. This is what makes a difference:
- The number and length of the joints
- How much old sealant there is and how hard it is to remove
- Any working-time requirements on site
- Any mould that needs treating
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
What we need to know
When you call or email, it’s useful to know:
- If someone has resealed it before
- Where the property is
- Photos by email, if that is easy
- How we’d reach the joints
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. When it suits you, phone 0345 464 0079 or send us an email.