Greater London · England
External & façade joints in Coombe, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Coombe and across Greater London. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Cracked joints where brick meets render or frames
- Water getting into walls through failed joints
- Old sealant gone brittle and cracked
Coombe: your questions answered
Can parking be tricky for a visit in Coombe?
Parking in Coombe, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
I let a flat near South Croydon station. Can you help?
Yes, we work for letting agents and landlords. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will send you a clear quote.
Do you work at height?
Each building is different. Tell us the height, the number of joints and what’s below them.
How long before the joint can be used?
That depends on the sealant used, so follow the cure time we give you when we finish.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We will tell you what we’re using and why.
Where are you based?
Mr Mastic is based in Crawley. We cover Coombe and the rest of Greater London.
How long does the job take?
A typical job takes a few hours to a few days, depending on the length of joint and the access. Your quote will say how long we expect yours to take.
Do you have insurance?
Yes. We are fully insured, and we can confirm the details when we quote.
External mastic for homes and businesses in Coombe
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing. Typical jobs include sealant that has lost its bond to the brick or render and failed sealant between panels on a façade, on brickwork movement joints, façade panels and concrete & block.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Coombe, tell us how high the joints are and how to reach the back of the building.
A 12-month guarantee comes as standard.
- Place
- Coombe (CR0, CR2, CR9)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
External mastic in Coombe: local notes
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts.
In the older streets around Church Hall United Reformed Church Of St Paul, an extension built onto an older house moves differently, and the joint between them takes the strain. If you let a flat or house near South Croydon station, split movement joints are easy to miss on a rental until damp shows inside. Schools such as Coombe Wood School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Coombe is about 1 mile east of Croydon, in Greater London. If you need external mastic in Coombe, it’s easy to get a quote: please call 0345 464 0079 or email us. We cover Greater London from our Crawley base. Coombe is one of 764 places in Greater London we cover for external mastic. Our London page covers work nearby (9 miles or so).
Our applicators cover all of CR0, CR2 and CR9 for external mastic. Local streets include Oaks Road, Coombe Road and Coombe Lane, all of which we cover. Neighbouring places we cover for external mastic include Croydon (1 mile west), Addiscombe (1 mile north), South Croydon (1 mile south-west), Shirley Oaks (1 mile north-east) and Shirley (1 mile north-east). Within a short drive, we also cover London (9 miles north), City of Westminster (11 miles north), Marylebone (11 miles north), Kensington (11 miles north-west), St Pancras (11 miles north) and Shoreditch (11 miles north).
Around Coombe
Around Coombe, our work takes us to homes and buildings near Coombe Lodge pub, Royal Russell School and St Peter's Primary School and the streets around them. The closest station to Coombe is South Croydon station, roughly 1 mile west. A little further out are St George's Walk (1.4 miles north-west) and Croydon Airport Visitor Centre (2.1 miles west). Not far away are Bramley Bank and Duppas Hill.
Different surfaces, different methods
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best in all weathers.
Render joints
Water behind render can lead to blown patches. Resealing the joints early keeps water out and protects the render itself.
How it works
When we arrive, we look over the joints with you first, so you know exactly what we’re doing. We protect the surfaces around the joints before we start. The work usually takes a few hours for a handful of joints, longer for a whole elevation. For a job in Coombe, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Let us know about earlier repairs to the joints
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about stairs, lifts or work at height
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. When it suits you, call 0345 464 0079 or email us.
Related advice
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Why it’s worth doing now in Coombe
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The wall then cracks somewhere else. A flexible sealant over backing rod is what the joint needs. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in Coombe.
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why book with us
- We leave the area clean and tidy
- Approved under the ARBOMaster scheme
- We agree the colour with you first
- A sealant colour to suit the surroundings
Read what affects the cost and our reviews.
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Walk round the building once a year and look at the joints
- Tell anyone working on the walls about the movement joints
- Clear growth from the base of walls and joints
- Ask before painting over external sealant
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
When it isn’t the sealant
We won’t take on work that will not last, so these are the limits:
- Render that’s blown, hollow or coming away
- Movement that is more than a sealant joint can take
- Adding movement joints to masonry that has none
If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before booking.
Where we work in Coombe
- Concrete & block
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
- Copings & trims
Can I do it myself?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.