Expansion Joint Sealing in Streatham
Sealant work in Streatham for main contractors, managing agents and facilities managers: expansion and movement joint sealing in walls, decks and floors, quoted at a fixed price.
- Damp inside where a wall movement joint has failed
- Movement joints with split or torn sealant
- New sealant over old, now failing
Expansion joint sealing for businesses in Streatham
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Leave it or put it right?
A torn seal left alone usually gets worse. Grit and water fill the gap and the material either side breaks up and the job grows to repairs as well as sealing. Resealing early keeps the work to sealant. In Streatham, each extra visit means more notices, permits and disruption, so a proper job first time, with the old sealant fully removed, is worth it.
Small jobs and large programmes are priced from the same things: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote and we’ll put a fixed figure on it.
Why appoint us
- 12-month guarantee on workmanship
- Failed material removed, not covered up
- Constructionline member for supplier checks
- One contact handling all your sites
Take a look at our cost guide or our accreditations and insurance.
Expansion joint sealing in Streatham
Mastic Doctor has sealed movement joints since 2005, for main contractors, FMs, managing agents and building owners. CHAS accredited, Constructionline member, CSCS-carded applicators and five million pounds of public liability insurance. Workmanship is backed by our 12-month guarantee. If you are dealing with spalled or broken joint edges in floors and decks and sealant pulling off the joint face, we can put it right, on podiums and floor movement joints, cladding panel joints and car park decks and ramps alike. One point of contact handles commercial sealant work in Streatham from the first photos to the final walk-round, for single jobs and planned programmes alike.
Areas such as a loading bay or car park deck in Streatham normally have to stay in use. Joints are done in sections, with bays coned off one after another, so the site keeps operating, at times agreed with the building manager.
Every job ends the same way: guaranteed. You get a 12-month guarantee on our workmanship, and the quote explains what it covers.
- Place
- Streatham (SW16, SW2, CR4, SW12)
- Wider area
- Greater London
- Cover
- A 12-month guarantee
- Price
- A fixed quote before we start
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Should maintenance staff do it?
Certain joints really need a specialist: for example fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. Getting these wrong typically costs more in the end than doing them right.
A short, simple internal joint is often within reach of a maintenance team. Where it goes wrong is preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.
Places near Streatham
Other services in Streatham
When it isn’t the sealant
A few problems need another trade or a different fix, and we point that out rather than sealing over them:
- Joints too narrow for the movement, which need redesigning by the engineer
- Waterproofing layers buried beneath the sealant
- Proprietary pre-formed expansion joint systems
If you are not sure, just call the office on 01277 525 020 or send details through our quote form and we will give you a straight answer before you book.
Surfaces we seal
- Precast concrete panel joints
- Blockwork control joints
- Cladding panel joints
- Podiums and floor movement joints
- Car park decks and ramps
- Brickwork movement joints
Common questions from Streatham clients
Can you work in a London building with booked loading and goods-lift slots?
Yes. Booked loading bays, goods lifts and permit-to-work systems are normal for London jobs. Say when the building is occupied and when it’s quiet, and we will plan accordingly.
Can you take on a job at a hospital such as British Home & Hospital for Incurables?
Yes, hospitals are one of the sectors we cover. We follow the site’s permits, sign-in and infection-control procedures in every area.
Will your applicators have CSCS cards?
Yes. Our applicators hold CSCS cards, as many construction sites ask for.
Does the weather affect the work?
Outside, yes. The joint has to be dry and within the product’s temperature range, so frost, rain or cold mornings can delay outside work. Inside work is seldom held up.
Why do our movement joints keep failing?
The common causes are poor preparation, three-sided adhesion, the wrong movement class and weathering. Working out the cause comes first since each needs a different fix.
How long will the new sealant last?
Nobody can honestly give a figure in years, since movement, weather, cleaning and use all affect it. Regular inspection is the best way to catch problems early.
What’s the quickest route to a quote?
You can use the quote form on this site; alternatively, speak to us on 01277 525 020 or send details through our quote form. Photos, drawings or a joint schedule help us quote quickly.
Our process
Tell us your site hours and access windows and we will plan around them. On the day, the work area is kept contained and tidy, and we check in with your contact before moving on to each new area. Planning a London job such as one in Streatham starts with access. Send the building rules and access times with your enquiry.
- First, the joints are inspected for width, movement and the type of failure.
- A fixed quote follows, naming the sealant and its movement class.
- The failed seal is removed and both faces are cleaned until sound and dry, flagging any broken edges that need repair before sealing.
- We control the depth with backing rod or, in shallow joints, bond-breaker tape.
- Where the maker calls for primer, it’s applied first, then the bead goes in and is tooled to a concave finish.
- We check every joint before sign-off, and the work carries our 12-month guarantee.
Before we start on site
- Send asbestos survey details if the building is pre-2000
- Have the specification and drawings to hand
- Share your working hours and any access restrictions
Quotes
Pricing a project or setting a maintenance budget? Send the scope and any drawings, and we’ll return a fixed quote that you can work with. For a chat about it beforehand, call the office on 01277 525 020 or email us.
Related advice
Joints that move: notes for Streatham
Less than 3 miles from Streatham there are at least three named estates and business parks. That puts plenty of warehouse floors, service yards and car parks close by, all with joints under traffic. In London, decks, bays and service yards typically have to keep running, so joints are sealed in sections with each area handed back once cured.
Phasing is what makes joint work possible on busy sites such as Mitcham Industrial Estate (1.5 miles south-west of Streatham): one bay, aisle or car park row at a time. On industrial estates such as Zennor Road Industrial Estate (1.3 miles north-west of Streatham), saw-cut floor joints, loading bay slabs and yard joints take the heaviest traffic.
Streatham is about 5 miles south of London, in Greater London. Streatham sits inside our coverage, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. Across Greater London, 764 places are covered, Streatham among them.
Commercial sites across SW16, SW2, CR4 and SW12 are covered for movement joints. We cover commercial and managed buildings on Stanthorpe Road, Gleneagle Mews and Madeira Road. Access to Streatham is via the A205 and A216 among other routes. Sites close to Streatham are covered too, including Streatham Park (1 mile west), Furzedown (1 mile west), Streatham Hill (1 mile north), Hyde farm estate (1 mile north) and Grange Mills (1 mile north-west). Nearby towns on our patch include London (5 miles north), City of Westminster (6 miles north), Marylebone (6 miles north), Kensington (6 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).
Landmarks near Streatham
Around Streatham, our work takes us to commercial buildings near Bishop Thomas Grant Catholic Secondary School, Streatham Common and Waldorf School of South West London, among other places. There’s a railway station in Streatham itself: Streatham station. A little further out are Clockworks Museum (1.1 miles east) and Southside Wandsworth (3.3 miles north-west). For a walk, there’s Knight's Hill and Battersea Park Lake.
Surface by surface
Car park decks and ramps
Deck and ramp joints take tyre loads, grit and de-icing salts. A trafficable sealant suited to the movement goes in.
Joints between different materials
Hybrid or MS polymer sealants bond to many substrates. We pick the product for the materials and the movement, and confirm it in the quote.
Do you need expansion joint sealing in Streatham?
Three-sided adhesion is a common cause of early failure. Sealant fixed to the base and sides can’t flex, so it tears, which is why depth control matters.
Things that usually lead to an enquiry:
- Expansion joints filled with dirt and stones
- Spalled or broken joint edges in floors and decks
- Leaks through car park deck joints onto the level below
- Torn sealant in brick or block movement joints
Retail centres such as Priory Retail Park, 2.3 miles west of Streatham, have floors, service yards and car parks with joints under constant traffic.
Questions to ask before you book
- What level of public liability insurance do they hold?
- How they’ll work around occupants
- Will CSCS-carded applicators be on site?
- The terms of the workmanship guarantee