Greater London · England
External Mastic in Norbury
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Norbury and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Rain getting behind render or cladding at a joint
- Rigid filler in a joint that should flex
- Old sealant gone brittle and cracked
Common questions in Norbury
Is parking an issue for external mastic in Norbury?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Can you help a landlord with a rental near Norbury station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just ring 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. We’ll reseal it with a flexible sealant.
Do the sealants smell?
Some sealants have a smell while they cure. Opening a window helps.
How do I get a quote for external mastic in Norbury?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or email us and let us know what needs doing and where.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Can you quote for more than one area?
Yes, and it often makes sense. Doing several areas at once is generally more efficient, so mention them when you ask for a quote.
Can you reach joints on upper floors?
That depends on the building and the joints. Where joints can be reached safely, we will do them. Tell us about the building and we will confirm what access is needed.
About our external mastic in Norbury
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. We work on concrete & block, joints between brick and frames and render & cladding joints, and common reasons people get in touch are water getting into walls through failed joints and weeds or debris growing in open joints.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. In a converted house in Norbury, it’s worth checking who is responsible for the outside before booking.
Whatever the size of the job, it’s backed by our 12-month guarantee in Norbury and across Greater London.
- Where
- Norbury (CR7, SW16, SE19)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Norbury
Also in Norbury
Walls and rooflines in Norbury
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Managing a site like Kensington Avenue Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For landlords with property near Norbury station, outside joints that have cracked can let damp into a rental, so check them between lets.
Norbury is about 1 mile north of Thornton Heath, in Greater London. If you need external mastic in Norbury, please call 0345 464 0079 or email us for a quick quote. We cover Greater London from our Crawley base, Norbury included. Across Greater London, we cover 764 places, Norbury among them. For nearby work, see our London page, about 6 miles away.
All of CR7, SW16 and SE19 is within our area for external mastic. Streets in the area include Green Lane, Croft Road and Downs Road, all of which we cover. If you are just outside Norbury, we cover Pollards Hill (1 mile north), Thornton Heath (1 mile south), Streatham (2 miles north-west), Streatham Park (2 miles north-west) and Mitcham (2 miles west). Within a short drive, we also cover London (6 miles north), City of Westminster (8 miles north), Marylebone (8 miles north), Kensington (7 miles north-west), St Pancras (8 miles north) and Shoreditch (8 miles north).
Local landmarks in Norbury
Typical jobs here are in homes near Norbury Manor Business and Enterprise College for Girls, Grangewood Park and Silburn Reid, among other places. For rail, the closest station is Norbury station, about 0.6 miles west of the centre. A little further out are Crystal Palace Museum (1.5 miles north-east) and Croydon University Hospital (1.3 miles south). Open spaces near Norbury include Knight's Hill and Biggin Wood.
What the job involves on each surface
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. Each is resealed with a weatherproof, flexible sealant.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
Can I do it myself?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Deal with leaking gutters that soak the joints below
- Show decorators and builders where the movement joints are
- Act on the first splits you see
- Look over the joints every year, ideally after winter
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They must stay as flexible joints, never rendered or pointed over.
A joint that has stopped moving pushes the movement elsewhere, generally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
Why act early in Norbury
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way and it means sorting access once. 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. Dealing with it early is far simpler.
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or email us and we will talk you through it.
What you get with us
- White, clear, grey or coloured to suit, where the product allows
- ARBOMaster approved applicator
- Over 20 years’ experience
- Trusted Arbo and Everbuild sealants
See what affects the cost and customer reviews.
Do you need external mastic in Norbury?
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.
Look out for any of the following:
- Plants rooting in failed movement joints
- Panel joints letting water in
- Movement joints filled with mortar instead of sealant
- Joints with sealant missing in places
For an older house near a landmark such as St Oswald, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Before you book anyone
- Who turns up on the day
- Whether you can choose the colour
- Whether they seal over old material or remove it
- How the joint is cleaned and prepared
The process
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a few hours to a few days, depending on the length of joint and the access. For a job in Norbury, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We look at every joint and agree a colour to suit the wall.
- 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.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Let us know about earlier repairs to the joints
- Keep pets and children clear of the area while we work
Get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we’ll talk you through the work and give you a clear price.
Advice
Landlords, agents and businesses in Norbury
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.
Landlords and letting agents in Norbury can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.