Greater London · England
External Mastic in Peaks Hill
External mastic in Peaks Hill from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
- Hard, crazed mastic that has stopped moving
About our external mastic in Peaks Hill
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall so the joint doesn’t stand out. Common call-outs are for panel joints letting water in and weathered mastic that no longer stretches, across joints between brick and frames, concrete & block and copings & trims.
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. For a flat in Peaks Hill, check the lease for who looks after the outside.
A one-year guarantee comes as standard, so you’re not left on your own once the job is done.
- Where
- Peaks Hill (CR8, SM6)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Questions from Peaks Hill
Can you do external mastic in Peaks Hill?
Yes. Our work covers London and the South East, and Peaks Hill is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
Can you help a landlord with a rental near Purley station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Do you work at height?
That depends on the building and the joints. We work on joints that can be reached safely. Tell us about the building and we’ll confirm what access is needed.
What should I tell you?
A short description and the location, plus photos if you have them. If we need more, we will ask.
Is there any odour?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
What colours does the sealant come in?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin, matched as closely as the range allows.
How long will you be here?
It depends on the size of the job, but as a guide it takes a few hours for a handful of joints, longer for a whole elevation. We will tell you when we quote.
What is backing rod for?
Backing rod goes into deeper joints as a matter of course. It controls the depth and stops the sealant bonding to the back so the bead can stretch.
How to look after the new joints
How long the joints last depends on use and care. Here’s what we suggest:
- Make sure movement joints aren’t pointed over
- Tell anyone working on the walls about the movement joints
- Clear growth from the base of walls and joints
- Look over the joints every year, ideally after winter
Follow the cure time we give you before the joint is knocked or disturbed. Most exterior sealants skin fast but take longer to cure right through.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal before water has had years to get in.
How the job changes by surface
Joints between dissimilar materials
Different materials may need different primers. We prepare both faces so the sealant bonds properly.
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. They’re resealed over backing rod with a low-modulus sealant coloured to suit the wall.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Outside joints around Peaks Hill
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
Rented homes near Purley station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. As a London address, Peaks Hill can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Peaks Hill is about 1 mile north-west of Purley, in Greater London. We provide external mastic to homes and businesses in Peaks Hill and the surrounding area, as part of our work across Greater London. Peaks Hill is one of 764 places in Greater London where we work for external mastic. There’s also a page for London, roughly 11 miles from Peaks Hill.
Here we cover the CR8 and SM6 postcode area for external mastic. If you need external mastic at a property on Furze Lane, Birch Lane and Plough Lane or a nearby road, we can help. Peaks Hill sits on or near the A2022, which makes travel easy. If you’re just outside Peaks Hill, we cover Russell Hill (1 mile north), Roundshaw (1 mile north), Woodcote (1 mile south-west), Purley (1 mile south-east) and Woodcote Green (1 mile west). We also work in nearby towns such as London (11 miles north), City of Westminster (12 miles north), Marylebone (12 miles north), Kensington (11 miles north), St Pancras (13 miles north) and Shoreditch (13 miles north).
Local landmarks in Peaks Hill
Around Peaks Hill, our work takes us to homes and buildings near Carshalton Park, Margaret Roper Catholic Primary School and The Foxley Hatch pub. The closest station to Peaks Hill is Purley station, roughly 0.8 miles south-east of the centre. Other landmarks nearby include St George's Walk (2.4 miles north-east) and Croydon Airport Visitor Centre (1 mile north-east). For a walk, there’s Duppas Hill and Roundshaw Downs.
What we are called out for in Peaks Hill
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, so it pulls away from the edges.
Look out for these signs:
- Panel joints letting water in
- Plants rooting in failed movement joints
- Gaps where render, brick and frames meet
- Joints pointed up with cement by mistake
Homes close to Church of St Mark include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What to look for in a quote
- The length of the guarantee
- How hidden problems are handled
- Whether the sealant suits the joint
- Who turns up on the day
Quotes for external mastic in Peaks Hill
For a quick quote, just ask. The main things that affect it are:
- Mould in or behind the old joints
- The type of sealant required
- Any working-time requirements on site
- The size of the job
The cost depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before we start, so you know where you stand.
What we need to know
Before you ask for a quote, have a think about:
- What’s wrong with the joints now
- Any previous sealing or DIY work
- A few pictures by email, if you can
- How we’d reach the joints
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work.
What we do, step by step
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it usually takes a few hours for a handful of joints, longer for a whole elevation. In Peaks Hill, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Tell us if parking is tricky
- On commercial sites, let us know about site rules
Getting a quote
For external mastic in Peaks Hill, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
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Places near Peaks Hill
What else we do in Peaks Hill
Leave it or put it right?
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The movement then cracks the brickwork or render nearby. The correct repair is a flexible sealant with the right backing. 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. Dealing with it early is far simpler.
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you’re unsure, ring 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Why Peaks Hill customers choose us
- We agree the colour with you first
- Arbo and Everbuild products
- ARBOMaster approved applicator
- Neat joints and a tidy finish
See our cost guide or what customers say.