Greater London · England
Monks Orchard External Mastic
External mastic for Monks Orchard and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Panel joints letting water in
- Damp patches traced to an open external joint
- Hard, crazed mastic that has stopped moving
External mastic for homes and businesses in Monks Orchard
Short cuts in external joints show up within a season or two. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We strip the joint back and start again. If you have plants rooting in failed movement joints and sealant pulling away from one side of the joint, we can put it right, whatever the surface.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so a leaking gutter joint or failed wall joint can affect more than one home. For a flat in Monks Orchard, check the lease for who looks after the outside.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Monks Orchard (CR0, SE25, CR9)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What the job involves on each surface
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best year round.
How it works
Once we are 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 for a handful of joints, longer for a whole elevation. In Monks Orchard, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- 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
- Mention any tricky access
- Where the joints are inside, avoid wetting them before we arrive
- Mention any sign-in or site rules at work premises
How to get a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Advice
Walls and rooflines in Monks Orchard
Historic houses like Addington Palace (about 1.8 miles south) are a reminder that the area around Monks Orchard has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For an older house near a landmark such as St George The Martyr Church, an extension built onto an older house moves differently, and the joint between them takes the strain. Monks Orchard is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Monks Orchard is about 2 miles north-east of Croydon, in Greater London. Jobs in Monks Orchard get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Monks Orchard is one of 764 towns and villages in Greater London where we work. For nearby work, see our London page.
All of CR0, SE25 and CR9 is within our area for external mastic, from the main roads to the quietest streets. If you need external mastic at a property on Long Lane, Poppy Lane and Homer Road or a nearby road, our applicators can take on the job. Close by, we work in Shirley (1 mile south), Shirley Oaks (1 mile west), Addiscombe (1 mile west), Ashburton (1 mile north-west) and Woodside (1 mile north-west). Larger places within reach include London (8 miles north), City of Westminster (10 miles north-west), Marylebone (10 miles north-west), Kensington (10 miles north-west), St Pancras (10 miles north) and Shoreditch (10 miles north).
Around Monks Orchard
Around Monks Orchard, our work takes us to homes and buildings near Orchard Way Primary School, The Cricketers pub and Ashburton Park and the streets around them. The closest station to Monks Orchard is Elmers End station, about 1.2 miles north. Other landmarks nearby include St George's Walk (2 miles west) and Crystal Palace Museum (2.8 miles north). Green spaces nearby include Bramley Bank and Duppas Hill.
What we’re called out for in Monks Orchard
Some movement joints have been pointed up with mortar by mistake. The joint can’t move, so the wall cracks somewhere else instead.
These are the problems we’re asked about most:
- Joints pointed up with cement by mistake
- Cracked joints where brick meets render or frames
- Joints where the bead has come unstuck
- Water getting into walls through failed joints
Schools such as Oasis Academy Shirley Park are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Questions to ask before booking
- Whether you can choose the colour
- Are they insured?
- What the cure time is
- What preparation is included
Why deal with it now?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble for homes in Monks Orchard.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What you get with us
- You choose the colour before work begins
- Tidy, careful work
- Trusted Arbo and Everbuild sealants
- Old sealant always removed completely
Read our cost guide and what customers say.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Leave the joints unpainted unless we have said otherwise
- Keep water from gutters off the wall
- Clear growth from the base of walls and joints
- Keep movement joints as flexible joints, not mortar
Don’t paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants aren’t designed to be painted, and paint can crack as the joint moves.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Catch it early and you reduce the risk.
Also near Monks Orchard
What else we do in Monks Orchard
Honest limits
A few problems are outside what sealant work can do:
- Subsidence or other structural problems
- Cutting new joints into brickwork, which is building work rather than sealant work
- Loose or hollow render, which needs re-rendering
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly.
Surfaces we seal
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Façade panels
- Copings & trims
- Joints between brick and frames
Monks Orchard: your questions answered
Do you work for landlords with property near Elmers End station?
Yes, we work for letting agents and landlords. Just call 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Can you do external mastic in Monks Orchard?
Yes, Monks Orchard is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we will send you a clear quote.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Pointing it stops it working and can lead to cracking. We will reseal it with a flexible sealant.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Where are you based?
Our base is Crawley. Our area covers South East England, London and Scotland.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
What do you need from me for a quote?
A short description and the location, plus photos if you have them. If we need more, we will ask.
Landlord and commercial work in Monks Orchard
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
We also work for property managers and facilities teams in Monks Orchard and across Greater London. We can quote a run of properties together, and we are fully insured.