Surrey · England
External & façade joints in The Chart, Surrey
External mastic in The Chart from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Weeds or debris growing in open joints
- Leaking joints around cladding and façade panels
- Cracked joints where brick meets render or frames
Questions from The Chart
Is The Chart within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you cover The Chart for external mastic?
Yes. Our work covers London and the South East, and The Chart is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
How long will you be here?
As a guide, most jobs take anything from a few hours to several days, depending on the building. Bigger jobs take longer.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we’re done.
Are you fully insured?
Yes. We are fully insured.
How much does external mastic cost in The Chart?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You will get a clear quote before we start.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
External mastic for homes and businesses in The Chart
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it, and we don’t skip that step. We work on brickwork movement joints, render & cladding joints and joints between brick and frames, and people most often call us about gaps where render, brick and frames meet and water getting into walls through failed joints.
Outside joints can only be sealed when they’re dry, so work in The Chart is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
Your job is guaranteed for a year, as with all our work.
- Place
- The Chart (RH8)
- Wider area
- Surrey
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Surface by surface
Cladding and façade panels
Panels heat up and cool down quickly, so the joint sealant has to cope with frequent movement. The sealant is chosen with that in mind.
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. We reseal them with an exterior sealant suited to the material.
Why act early in The Chart
Water gets in through a failed movement joint, behind render and cladding. Dealing with it early keeps the repair to the joint, rather than the wall around it. Around The Chart, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint usually makes the job bigger, not smaller. If you are not sure whether it needs doing, call 0345 464 0079 or email us for an honest opinion and a quote.
Why book with us
- Neat joints and a tidy finish
- Anti-fungal sanitary silicone in wet areas
- We never seal over old sealant
- We are fully insured
Read what affects the cost or what customers say.
What we cannot put right
It helps to know what we cannot do too:
- Adding movement joints to masonry that has none
- Loose or hollow render, which needs re-rendering
- Cracks in the bricks or render themselves, away from the joints
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think.
Surfaces we seal
- Façade panels
- Concrete & block
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
Towns and villages near The Chart
What else we do in The Chart
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can be quoted together.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
When to call us in The Chart
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it cannot stretch and tears as soon as the joint widens.
Keep an eye out for any of the following:
- Old sealant gone brittle and cracked
- Movement joints with cracked, split or missing sealant
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
For landlords with property near Hurst Green station, outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- Is the old sealant removed completely?
- How long to leave it before use
- What the quote includes, VAT included or not
- What happens if the job turns out different
What we do, step by step
All our tools and materials come with us in the van. Once we’ve agreed what’s being done, we protect the area and start. Most jobs take a few hours for a handful of joints, longer for a whole elevation. Somewhere as small as The Chart, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Keep children and pets away from the work area
- Move anything stored near the joints
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, call 0345 464 0079 or email us.
Related advice
External mastic in The Chart: local notes
With historic houses such as Chartwell (about 1.9 miles east) nearby, there’s older building stock in the area around The Chart as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Managing a site like Limpsfield CofE Infant School? Then larger buildings have long runs of movement joint that eventually need resealing. In the older streets around St Andrew's, the joints between older walls, newer extensions and the roofline need a sealant that can move.
The Chart is about 6 miles south-east of Caterham, in Surrey. Every kind of property in The Chart is covered for external mastic. Every job comes with our 12-month guarantee. The Chart is one of 395 places in Surrey where we work. Crawley is on our list too, around 14 miles away.
Every address in RH8 is covered for external mastic, from the main roads to the quietest streets. You will find streets such as Stoneleigh Road, St Andrews Way and Ridlands Lane, all of which we cover. Close by, we work in Pains-Hill (1 mile west), Moorhouse Bank (1 mile north-east), Goodley Stock (1 mile east), Limpsfield (1 mile north-west) and Crockham Hill (1 mile south-east). We also work in nearby towns such as Epsom (15 miles north-west), Horley (10 miles south-west), Redhill (9 miles west), Ewell (15 miles north-west), Reigate (10 miles west) and Caterham (6 miles north-west).
Local landmarks in The Chart
Typical jobs here are in homes near Carpenters Arms, Oxted School and Hazelwood School, among other places. The Chart’s nearest station is Hurst Green station, roughly 1.6 miles west of the centre. Nearby you’ll also find Tandridge Priory (0.6 miles north-west). Not far away are Botley Hill and Bay Pond.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Walk round the building once a year and look at the joints
- Have failed joints looked at early
- Show decorators and builders where the movement joints are
- Keep water from gutters off the wall
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
A joint that has stopped moving pushes the movement elsewhere, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.