Greater London · England
External Mastic in Tooting Bec
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Tooting Bec. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Plants rooting in failed movement joints
- Joints with sealant missing in places
- Movement joints filled with mortar instead of sealant
External mastic in Tooting Bec
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where a rigid filler would soon crack. Common call-outs are for joints pointed up with cement by mistake and plants rooting in failed movement joints, on brickwork movement joints, façade panels 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. In a converted house in Tooting Bec, it’s worth checking who is responsible for the outside before booking.
Whatever the size of the job, you get the same 12-month guarantee.
- Location
- Tooting Bec (SW17, SW19, CR4)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Tooting Bec
Can you help a landlord with a rental near Tooting station?
Yes. We work for letting agents and landlords as well as homeowners, 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.
Is Tooting Bec in your area for external mastic?
Yes, Tooting Bec is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
Can you seal over the old sealant?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Can you reach joints on upper floors?
Each building is different. Tell us the height, the number of joints and what’s below them.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
How long does external mastic last?
It varies with how exposed the wall is and how much the joint moves. Look for splits, hardening or edges coming away and have them redone then.
Do you take out the old sealant first?
Yes, every time. New silicone does not stick to old silicone, so the joint is cleaned back first.
Is it worth trying it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
What affects the quote in Tooting Bec
The quote reflects the job in front of us. We take into account:
- How many rooms, windows or areas are involved
- Any mould that needs treating
- The old material and how stubborn it is
- Whether the work is at height
We don’t show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Asking for a quote
Before you ask for a quote, have a think about:
- A few pictures by email, if you can
- How many joints, rooms or windows are involved
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
We quote each job on its own, so start by telling us what you need. Just ring 0345 464 0079 or email us with the details and send pictures if you have them.
Nearby places to Tooting Bec
What else we do in Tooting Bec
Landlord and commercial work in Tooting Bec
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
If you’re set on DIY, put the effort into 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.
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Show decorators and builders where the movement joints are
- Walk round the building once a year and look at the joints
- Keep movement joints as flexible joints, not mortar
- Avoid pressure-washing directly into sealant joints
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.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
What we do, step by step
A visit follows a simple pattern: we look at the joints together, protect the area around them, carry out the job and tidy away. It usually takes anything from a few hours to several days, depending on the building. In Tooting Bec, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Mention any parking rules near the property
- Keep children and pets away from the work area
Getting a quote
There’s no standard price list, because every job is different. Instead, we give you a clear quote for your job. To arrange one, ring 0345 464 0079 or send us an email.
Related advice
How the job changes by surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.
When something else is needed
We will always be straight with you, so here’s what new sealant won’t do:
- Cracks in the bricks or render themselves, away from the joints
- Adding movement joints to masonry that has none
- Loose or hollow render, which needs re-rendering
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think before booking.
Surfaces we seal
- Brickwork movement joints
- Copings & trims
- Concrete & block
- Render & cladding joints
- Façade panels
- Joints between brick and frames
Walls and rooflines in Tooting Bec
Historic houses like Southside House (about 3 miles west) are a reminder that the area around Tooting Bec has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking.
Managing a site like St Boniface RC Primary School? Then larger buildings have long runs of movement joint that eventually need resealing. Homes close to St Augustine include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep. Tooting Bec is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Tooting Bec is about 3 miles south-west of Stockwell, in Greater London. For external mastic in and around Tooting Bec, please ring 0345 464 0079 or email us for a quick quote. We cover Greater London from our Crawley base. We cover 764 towns and villages across Greater London, large and small. Our London page covers work nearby, about 6 miles away.
Here we cover the SW17, SW19 and CR4 postcode area for external mastic. That includes homes and businesses on Vant Road, Byton Road and Avarn Road and the roads around them. Close by, we work in Tooting (1 mile south-east), Colliers Wood (1 mile south), Furzedown (1 mile east), Summerstown (1 mile north-west) and Streatham Park (1 mile east). Larger places within reach include London (6 miles north-east), City of Westminster (6 miles north), Marylebone (6 miles north), Kensington (5 miles north), St Pancras (7 miles north) and Shoreditch (8 miles north-east).
What’s near Tooting Bec
In Tooting Bec, that means homes and buildings near Wandle Park, King's Head pub and Ernest Bevin College and the streets around them. For rail, the closest station is Tooting station, about 0.6 miles south of the centre. A little further out are Grove Hospital (less than half a mile south-west) and Southside Wandsworth (2.1 miles north-west). Green spaces nearby include Henman Hill and Battersea Park Lake.