Expansion Joint Sealing in St Johns
Expansion and movement joint sealing in walls, decks and floors in St Johns and across Greater London. CHAS accredited and fully insured, with a 12-month guarantee.
- Sealant peeling off one face of the joint
- Chipped joint edges on forklift routes
- Weathered movement joint sealant that no longer flexes
Expansion joint sealing for businesses in St Johns
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Expansion joint sealing in St Johns, done properly
Brickwork and blockwork walls have vertical movement joints at intervals, and they’re easy to miss until the sealant fails. Once the seal fails, rain reaches the cavity and the joint can no longer close. The old seal is cut away, backing rod goes in at depth, and a low-modulus masonry sealant is gunned and tooled with primer where the maker calls for it. If you are dealing with spalled or broken joint edges in floors and decks and movement joints with split or torn sealant, we can put it right, on brickwork movement joints, blockwork control joints and precast concrete panel joints alike. Facilities teams, main contractors and managing agents in St Johns tend to want the same three things: a fixed quote, no surprises on site and a 12-month guarantee behind the result.
Floor and movement joints in London take heavy use: car park decks, loading bays, shopping centre malls and podiums over occupied space. When a joint fails, grit and water get in and the arrises start to break up, so it pays to act early.
Every job we finish is backed by a 12-month workmanship guarantee. If a joint we sealed fails because of how it was installed, we come back and put it right.
- Location
- St Johns (SE13, SE10, SE8)
- Region
- Greater London
- Cover
- 12 months on every job
- Quotes
- Fixed quote, scope in writing
- Call
- 01277 525 020
- Updated
- 3 November 2026
Why act early in St Johns
Re-sealing with the same product that failed is often a false economy. If the joint is too narrow or the product wrong for the movement, it needs a different approach and we will tell you honestly. In St Johns, each extra visit means more notices, permits and disruption, so cutting the old sealant out fully and doing it right once is the better route.
There’s no price list, because the scope varies so much from one building to the next. For a fixed figure, call for a quote.
Why us?
- Over 20 years of commercial sealing
- Work carried out by CSCS-carded applicators
- Fixed quotes based on photographs, drawings or a visit
- Fully insured
See how commercial sealant jobs are priced or our accreditations and insurance.
Doing it in-house
Putting right a botched joint often costs more than sealing it well at the start, since all of it has to come out and the faces be cleaned back again. That’s why many clients bring in a specialist from the beginning.
Certain joints really need a specialist: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. Getting these wrong typically costs more in the end than doing them right.
Different surfaces, different methods
Car park decks and ramps
Failed deck joints often show as leaks on the level below. The old seal comes out, the edges are prepared and the joint resealed.
Podium joints
Podium decks are exposed and often trafficked. A sealant suited to both traffic and exposure is used.
How a job runs
Where the site stays busy, we agree a sequence with your contact so the disruption stays in one area at once. Each section is protected, cleaned back and sealed, then handed back before we move to the next. In St Johns, most buildings stay in use during the work, so zones and timings are agreed with whoever manages the building. Areas are handed back as each section is finished.
- We assess the joints on site or from photos, noting widths and how each has failed.
- A fixed quote names the sealant we propose and its movement class.
- Phasing is agreed so decks, floors or entrances can stay in use where needed.
- The failed seal is cut out and both joint faces cleaned back to sound material.
- Backing rod or bond-breaker sets the depth, primer goes on where specified, and the sealant is applied and tooled.
- Finished joints are inspected, the cure time confirmed and the 12-month guarantee applies.
What we need from you
- Point out parking and an unloading spot
- Let us know about inductions and permits
- Let building users know which areas are affected
Getting a fixed quote
Let us know the site, the scope and your timescale, and a fixed quote will follow. The easiest way is to ring 01277 525 020 or email us.
Related advice
Other services in St Johns
For managing agents and facilities managers
Whether you are a managing agent, a property factor or an owner’s representative: send the details, accept a fixed quote, and we carry out and guarantee the work. Keys, access and contacts can be agreed in advance.
Housing associations and managing agents often need work done across blocks and communal areas. Work can be phased so residents and staff keep access throughout, and each stage is agreed with your contact.
Floors, slabs and movement joints in St Johns
London car parks, loading bays and podium decks often can’t close for long, so joints are sealed in sections with each area handed back once cured. Less than 3 miles from St Johns 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.
Campuses like University of Greenwich - Greenwich Campus (1.1 miles north-east of St Johns) mix old and new buildings, with movement joints wherever they meet. Large sites such as University Hospital Lewisham (1.1 miles south of St Johns) have car parks, service roads and long elevations with movement joints in brick and panels. Warehouse floors on estates like Brookmarsh Industrial Estate, 0.7 miles to the north of St Johns, carry pallet trucks and forklifts over every saw-cut joint.
St Johns is about 4 miles south-east of London, in Greater London. Commercial clients in St Johns use us for work on movement joints. Our Greater London coverage takes in 764 places.
We take on movement joints across the SE13, SE10 and SE8 postcode area, for business premises of every kind. We cover commercial and managed buildings on Avon Road, Mill Lane and Clare Road and the roads nearby. Main routes into St Johns include the A2210 and A2211, which helps when planning parking and deliveries for the job. Sites close to St Johns are covered too, including New Cross (1 mile west), Deptford (1 mile north), Lewisham (1 mile south-east), Telegraph Hill (1 mile west) and Ladywell (1 mile south). Nearby towns on our patch include London (4 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (8 miles west), St Pancras (6 miles north-west) and Shoreditch (5 miles north-west).
Landmarks near St Johns
In St Johns, that means premises near Wickham Arms, Brookmill Park and Addey and Stanhope School. Other local landmarks include St. Paul's (0.7 miles north) and Laban Centre (0.8 miles north). There’s a railway station in St Johns itself: St Johns station. Nearby you will also find Fan Museum (0.9 miles north-east) and Lewisham Shopping Centre (0.7 miles south-east). The countryside around St Johns includes Brookmill Road Local Nature Reserve and Tower Hill.
Questions we are asked in St Johns
Can you take on a job at a hospital such as University Hospital Lewisham?
Yes, healthcare and care buildings are part of our work. Work is phased so departments keep running, under the site’s own rules.
Do you work in London buildings with loading restrictions?
Yes. Booked loading bays, goods lifts and permit-to-work systems are normal for London jobs. Share the building’s contractor rules and we will work to them. We allow for the ULEZ, which covers every borough
Can weather delay the job?
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.
What causes movement joint sealant to fail?
Most often the movement is too much for the product or the joint width. That’s why we check width, depth and movement class before quoting, rather than replacing like for like.
Do you take on small jobs?
We quote for single jobs as well as large packages and programmes. Photos and a description are enough to start.
Can a joint be sealed if the edges are broken?
Spalled edges need repairing before a new seal will last, and we’ll point out where that’s the case. Sealing over them leads to early failure.
Will you just go over the old sealant?
No. Sealing over old material is one of the classic causes of early joint failure, so it all comes out first.
When it isn’t the sealant
A proper diagnosis includes knowing what sealant can’t do. We will tell you if the real problem is one of these:
- Crumbling edges that would give a new bead nothing sound to grip
- Leaks coming from the membrane rather than the joint seal
- A joint that has to be widened or re-detailed before it can work
Not sure which it is? You can speak to us on 01277 525 020 or email us and we will tell you honestly before you book.
Joints and surfaces we work on
- Car park decks and ramps
- Cladding panel joints
- Precast concrete panel joints
- Podiums and floor movement joints
- Blockwork control joints
- Brickwork movement joints