Greater London · England
External & façade joints in Crofton, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Crofton and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Sealant that has lost its bond to the brick or render
- Joints with sealant missing in places
- Weathered mastic that no longer stretches
Leave it or put it right?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render near the open joint, so the problem grows beyond the joint itself. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why Crofton clients choose us
- Sanitary silicone with an anti-fungal additive in wet areas
- Any old sealant cut out fully, not covered over
- 20+ years of sealant experience
- Colour agreed with you before we start
See our cost guide or our reviews.
How we handle external mastic in Crofton
On houses, flats and commercial buildings across Crofton, we reseal joints in brickwork, render, cladding and façade panels. Every joint gets the same careful preparation: clean, sound faces and a controlled depth. We work on render & cladding joints, copings & trims and joints between brick and frames, and people most often call us about leaking joints around cladding and façade panels and damp patches traced to an open external joint.
Outside work in London starts with access: side passages, upper floors and where to park. In Crofton, joints up high may need ladders or other access, which is worth talking through when you book.
You’re covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or drop us an email.
- Location
- Crofton (BR6, BR5)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
External mastic in Crofton: local notes
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Crofton is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Schools such as Crofton Infant School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Crofton is about 1 mile south-west of Orpington, in Greater London. Crofton gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. 764 places in Greater London are on our list, from the larger towns to small villages. We also work in London, around 11 miles away.
Every address in BR6 and BR5 is covered for external mastic. Local streets include Grange Road, Reed Avenue and Gumping Road. Other places close to Crofton include Broom Hill (1 mile north-east), Locksbottom (1 mile west), Petts Wood (1 mile north), Farnborough (1 mile south) and Green Street Green (2 miles south). Larger places within reach include London (11 miles north-west), City of Westminster (14 miles north-west), Marylebone (14 miles north-west), Kensington (15 miles north-west), St Pancras (14 miles north-west) and Shoreditch (12 miles north-west).
Local landmarks in Crofton
In Crofton, that means homes and buildings near The Priory School, Newstead Wood School and The Maxwell pub. Crofton has its own railway station: Orpington station. Other landmarks nearby include Orpington Hospital (1.1 miles south-east) and Crofton Roman Villa (under half a mile south-east). The countryside around Crofton includes Summer Hill and The Warren.
Questions from Crofton
Do you work for landlords with property near Orpington station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Do you cover Crofton for external mastic?
Yes, Crofton is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or drop us an email and let us know what needs doing.
Do you seal joints where cladding meets other materials?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. We pick a colour that works with both materials.
Can a movement joint be filled with mortar?
No. Rigid materials can’t move with the wall. If it has already been filled, we can generally cut it out and reseal it.
What’s an expansion joint in brickwork?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.
Is there any odour?
That depends on the sealant. Some products have a noticeable smell, others very little.
What do you put in the joint?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
What do you need from me for a quote?
Let us know what needs doing and where, with photos by email if possible. We’ll ask anything else we need to know.
When to call us in Crofton
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
Most people get in touch after spotting one of these:
- Failed seals between different materials
- Brick movement joints where the sealant has split
- Weathered mastic that no longer stretches
- Leaking joints around cladding and façade panels
For an older house near a landmark such as Church of Jesus Christ of Latter-Day Saints, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Questions to ask before you book
- How the joint is cleaned and prepared
- Who turns up on the day
- What guarantee comes with the work
- What insurance they hold
What we can’t put right
We’ll always be straight with you, so here’s what sealant cannot fix:
- Render that is blown, hollow or coming away
- Rising or penetrating damp from elsewhere in the wall
- Walls that need new movement joints cut into them
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Where we work in Crofton
- Joints between brick and frames
- Concrete & block
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Façade panels
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Make sure movement joints are not pointed over
- Fix overflowing gutters above sealed joints
- Leave the joints unpainted unless we have said otherwise
- Wash walls gently around the sealant
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established, so it’s worth resealing at the first signs.
How the job changes by surface
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
DIY sealant or a professional job?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
Nearby places to Crofton
Other services in Crofton
What happens on the day
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from a few hours to several days, depending on the building. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Crofton. It helps if you can point us to a visitor permit or a bay close to the door.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- On commercial sites, let us know about site rules
- Mention if the joints have been sealed before
- Let us know about parking restrictions
Getting 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 add photos by email if you can.