Surrey · England
External Mastic in Old Malden
Specialist external mastic for Old Malden: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Failed sealant between panels on a façade
- Gaps where render, brick and frames meet
- Sealant pulling away from one side of the joint
Common questions in Old Malden
Can you do external mastic in Old Malden?
Yes, Old Malden is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Can you help a landlord with a rental near Tolworth station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Is it OK to fill a movement joint with cement?
No. Cement or mortar can’t stretch and the joint fails. Where a joint has been mortared, it can often be raked out and sealed properly.
Is it OK to seal over old sealant?
No, because it fails. The old sealant always comes out first, so the new sealant bonds properly.
Why do you put foam in the joint first?
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.
How long does external mastic take?
Typically it takes a few hours for a handful of joints, longer for a whole elevation. Larger jobs naturally take longer, and we’ll say how long yours will take.
How often do external joints need resealing?
It varies from wall to wall: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Every job carries our one-year guarantee.
What should I tell you?
The location, the problem and the rough size of the job. If you can, email a few photos.
How we handle external mastic in Old Malden
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. We are often asked to deal with failed seals between different materials and rigid filler in a joint that should flex, across joints between brick and frames, brickwork movement joints and façade panels.
Around Old Malden, garages, outbuildings and extensions all add to the joints on the outside of a home. Gutter ends, garage door frames and the joints where an extension meets the house are typical spots for leaks.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Old Malden (KT19, KT4, KT5)
- Wider area
- Surrey
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What we do, step by step
We keep the work tidy and contained to the joints we are treating, so you can carry on as normal. The job normally takes anything from a few hours to several days, depending on the building, and we explain the cure time before we leave. For a job in Old Malden, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- 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.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Tell us if parking is tricky
- Move anything stored near the joints
Getting a quote
Getting a quote is simple: let us know what needs doing and where and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.
Advice
Why it’s worth doing now in Old Malden
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner. In an older home around Old Malden, damp from a failed joint can get into timber and plaster, and that is a much bigger job than renewing the sealant.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we’ll go through it with you.
Why us?
- ARBOMaster approved applicator
- 4.9 on Google from 180+ five-star reviews
- Sanitary silicone with an anti-fungal additive in wet areas
- Arbo and Everbuild products
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Point out the joints to other trades
- Ask before painting over external sealant
- Never let anyone fill a movement joint with mortar
- Wash walls gently around the sealant
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint.
Once a joint cannot move, the wall finds another way, usually as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
External mastic in Old Malden: local notes
Historic houses like Fitznells Manor (about 1.8 miles south-east) are a reminder that the area around Old Malden 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. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Managing a site like Knollmead Primary School? Then larger buildings have long runs of movement joint that eventually need resealing. Homes close to Parish Church of St Mary the Virgin include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep. Letting a property close to Tolworth station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Old Malden is about 2 miles north-west of Ewell, in Surrey. Wherever you are in the KT19 postcode area, we can carry out external mastic at your property. We cover 395 towns and villages across Surrey, large and small. Our London page covers work nearby.
Jobs for external mastic in KT19, KT4 and KT5 is quoted and booked the same way as anywhere else. Whether your property is on Curtis Road, Rowden Road and Grafton Road or a nearby road, we can help. Nearby, we also carry out external mastic in Worcester Park (1 mile east), Tolworth (1 mile north-west), Stoneleigh (1 mile south-east), Berrylands (1 mile north-west) and Chessington (2 miles south-west). Within a short drive, we also cover Woking (14 miles west), Epsom (3 miles south), Horley (14 miles south), Redhill (10 miles south-east), Egham (13 miles west) and Reigate (10 miles south).
Near you in Old Malden
In Old Malden, that means homes and buildings near Richard Challoner School, The Plough Inn Public House and Hogsmill LNR, among other places. The nearest railway station is Tolworth station, roughly 0.5 miles west of the centre. Well-known places in the area include Bentall Centre (3 miles north-west) and Tolworth Hospital (0.9 miles west). The countryside around Old Malden includes The Lake and Kingston Hill Road area.
What affects the cost of external mastic
Your quote is based on your job. We look at:
- Whether old sealant or filler has to be cut out
- Which sealant suits the joint
- The size of the job
- Access and height
The cost reflects the work involved, not guesswork. That is why we ask about the job first.
Asking for a quote
When you contact us, it’s useful to know:
- Photos by email, if that’s easy
- Whether it has been sealed before
- Where the job is, and your postcode
- How many joints, rooms or windows are involved
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Landlord and commercial work in Old Malden
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 that we can handle for you.
We work for landlords and agents as well as homeowners. Resealing between tenancies keeps a property looking cared for.
Nearby places to Old Malden
More services for Old Malden
Surface by surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant in a colour to suit the brick.
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two so neither cracks the other.
Should I try it myself first?
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.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.