Greater London · England
External Mastic in Waddon
Specialist external mastic for Waddon: careful preparation, the right product and tidy work. Call for a quick quote.
- Hard, crazed mastic that has stopped moving
- Damp patches traced to an open external joint
- Plants rooting in failed movement joints
External mastic for homes and businesses in Waddon
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two. We work on copings & trims, façade panels and joints between brick and frames, and common reasons people get in touch are damp patches traced to an open external joint and joints where the bead has come unstuck.
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 Waddon, it’s worth checking who is responsible for the outside before booking.
Big or small, you get the same 12-month guarantee.
- Where
- Waddon (CR0, CR2, SM6)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the cost of external mastic
We quote each job individually. This is what makes a difference:
- The number and length of the joints
- How much old sealant there is and how hard it is to remove
- The product the joint needs
- Working hours on commercial sites
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will go through it with you.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- Whether it has been sealed before
- Whether it’s a home or a business
- Photos by email, if that’s easy
- The address or postcode of the job
We don’t publish a price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or drop us an email.
Keeping the joints in good condition
Aftercare is simple, and it makes a real difference:
- Keep soil, plants and ivy away from the joints
- Have failed joints looked at early
- Look over the joints every year, ideally after winter
- Make sure movement joints are not pointed over
Do not let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
What happens on the day
On the day, we look over the joints with you first. We protect the surfaces around the joints before we start. Most jobs take a few hours to a few days, depending on the length of joint and the access. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- 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.
How to prepare
- On commercial sites, let us know about site rules
- Let us know about earlier repairs to the joints
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
We quote each job on its own. Simply ring 0345 464 0079 or drop us an email and describe the job, and photos are welcome.
Read more
Can I do it myself?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Walls and rooflines in Waddon
Historic houses like Addington Palace (about 3.1 miles east) are a reminder that the area around Waddon has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
If you live in an older home near Church of St George, the joints between older walls, newer extensions and the roofline need a sealant that can move. Rented homes near Waddon station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Waddon is about 1 mile west of Croydon, in Greater London. Across the CR0 area, our applicators can take on external mastic. Our Greater London coverage runs to 764 places, Waddon among them. London is on our list too, around 9 miles away.
All of CR0, CR2 and SM6 is within our area for external mastic, from the main roads to the quietest streets. That includes homes and businesses on Abbey Road, Alton Road and Epsom Road. We also cover the places around Waddon: Old Town (1 mile north-east), Bandonhill (1 mile west), Beddington (1 mile north-west), Russell Hill (1 mile south-west) and Roundshaw (1 mile south-west). Within a short drive, we also cover London (9 miles north), City of Westminster (11 miles north), Marylebone (11 miles north), Kensington (10 miles north), St Pancras (11 miles north) and Shoreditch (11 miles north).
What’s near Waddon
Around Waddon, our work takes us to homes and buildings near St Andrew's CofE School, Rutherford School and Duppas Hill and the streets around them. Waddon has its own railway station: Waddon station. Other landmarks nearby include St George's Walk (0.9 miles north-east) and Purley War Memorial Hospital (1.7 miles south). For a walk, there’s Duppas Hill and Roundshaw Downs.
Places near Waddon
What else we do in Waddon
Do you need external mastic in Waddon?
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall and make things worse.
Any of these means the joints need attention:
- Panel joints letting water in
- Rain getting behind render or cladding at a joint
- Moss and dirt in joints with no sealant left
- Joints with sealant missing in places
For site and facilities teams at buildings such as Aerodrome Primary Academy, larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before booking
- What happens if the job turns out different
- What insurance they hold
- Whether you can choose the colour
- Whether the sealant suits the joint
Surface by surface
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. A primer goes on where the product requires one before sealing.
What we cannot put right
A few problems are outside what sealant work can do:
- Walls that need new movement joints cut into them
- Render that’s blown, hollow or coming away
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If you are not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Render & cladding joints
- Copings & trims
- Façade panels
- Concrete & block
- Brickwork movement joints
- Joints between brick and frames
Common questions in Waddon
Do you cover Waddon for external mastic?
Yes. Our work covers London and the South East, and Waddon is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Can parking be tricky for a visit in Waddon?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can you seal over the old sealant?
No, it will not last. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
How often do external joints need resealing?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year.
What colours does the sealant come in?
We choose a sealant colour to suit the brick, stone or render, so the joint sits quietly in the wall. Exterior sealants come in a good range of colours.
Are you insured?
Yes. We’re fully insured.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.