Surrey · England
Chaldon External Mastic
Movement joints in Chaldon need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Movement joints with cracked, split or missing sealant
- Leaking joints around cladding and façade panels
- Joints pointed up with cement by mistake
External mastic in Chaldon
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. Typical jobs include weathered mastic that no longer stretches and water getting into walls through failed joints, on joints between brick and frames, render & cladding joints and concrete & block.
In a village or hamlet like Chaldon, older cottages and farm buildings often stand in the open, 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.
Big or small, it’s backed by our one-year guarantee in Chaldon and across Surrey.
- Where
- Chaldon (CR3)
- Wider area
- Surrey
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What we do, step by step
The work is kept neat and contained to the joints we’re treating, so you can get on with your day. The job usually takes a few hours to a few days, depending on the length of joint and the access, and we explain the cure time before we leave. For a village or hamlet like Chaldon, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- Each joint is checked and the colour of the new sealant agreed.
- 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.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Clear items away from the joints we’re working on
- Mention any leaks or damp you’ve noticed
- Try not to wet indoor joints just before the visit
Get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.
Advice
Why deal with it now?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. Older cottages and farmhouses around Chaldon can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
The cost reflects the work involved, not guesswork. That is why we ask a few questions first.
Why book with us
- A sealant colour to suit the surroundings
- Experience in homes, commercial sites and hotels
- Anti-fungal silicone where joints get wet
- White, clear, grey or another colour, product permitting
See our cost guide and what customers say.
Aftercare tips
After the cure time, these simple habits help:
- Make sure movement joints are not pointed over
- Get split or bare joints resealed while the damage is small
- Avoid pressure-washing directly into sealant joints
- Don’t let climbing plants root in the sealant
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
What external mastic looks like in Chaldon
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Caterham station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to Church of St Peter and St Paul include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Chaldon is about 1 mile south-west of Caterham, in Surrey. Anywhere in CR3, our applicators can take on external mastic. Chaldon is one of 395 towns and villages in Surrey where we work. Crawley is on our list too, around 12 miles away.
We cover every part of CR3 for external mastic. External mastic is available to properties on Mount Avenue, Linden Drive and Marshall Close. Main roads around Chaldon include the B2031. If you are just outside Chaldon, we cover Netherne on-the-Hill (2 miles north-west), Merstham (2 miles west), Brewer Street (2 miles south), South Merstham (2 miles south-west) and Hooley (2 miles west). Larger places within reach include Epsom (8 miles north-west), Horley (7 miles south), Redhill (4 miles south-west), Ewell (8 miles north-west), Reigate (5 miles south-west) and Walton-on-Thames (15 miles north-west).
What’s near Chaldon
We work in homes and buildings around de Stafford School, Kitchen Copse and The King And Queen Public House, among other places. For rail, the closest station is Caterham station, roughly 1.2 miles east. Other landmarks nearby include Bletchingley Castle (2.8 miles south) and St Lawrence's Hospital (0.5 miles north-east). For a walk, there’s South London Downs National Nature Reserve and Nore Hill.
How we quote for external mastic
We do not publish a price list, because no two jobs are the same. What we look at:
- The amount of work
- Working hours on commercial sites
- The product the joint needs
- How easy the joints are to reach
What it costs depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start.
Asking for a quote
What to tell us when you ask for a quote:
- Photos by email, if that is easy
- The type of property
- How we’d reach the joints
- Where the job is, and your postcode
To get a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. We will give you a clear quote before any work starts.
Your questions about external mastic in Chaldon
Do you work for landlords with property near Caterham station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Will you come out to Chaldon?
Yes, Chaldon is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
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’ll tell you what we are using.
How long does the job take?
As a guide, most jobs take a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer, and we’ll tell you how long to expect.
Do you use backing rod?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. That way it bonds to the two sides only and can stretch.
Where do you work from?
Our base is Crawley. Our area covers South East England, London and Scotland.
Do you seal joints where cladding meets other materials?
Yes. Joints between dissimilar materials are a big part of external work. We use a flexible sealant suited to both surfaces with primer where required.
Different surfaces, different methods
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.
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.
Do you need external mastic in Chaldon?
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
Most people get in touch after spotting one of these:
- Rain getting behind render or cladding at a joint
- Joints where the bead has come unstuck
- Movement joints filled with mortar instead of sealant
- Panel joints letting water in
For site and facilities teams at buildings such as St Peter and St Paul CofE Infant School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- Whether all the old sealant comes out first
- Whether VAT is included
- Which colour the sealant will be
- How hidden problems are handled
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report. Several properties can be quoted together.
For anyone letting property in or around Chaldon, several properties can be quoted together. Just tell us the addresses and what each one needs, and pictures by email help.