Expansion joint sealing in St Mary Cray
We carry out expansion and movement joint sealing in walls, decks and floors in St Mary Cray and the surrounding area. Send photographs or drawings for a fixed quote.
- Rain penetration at brick or block movement joints
- Arrises breaking up along floor joints
- Brittle, chalky sealant on external joints
Expansion joint sealing for businesses in St Mary Cray
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Questions we’re asked in St Mary Cray
Can you work at a site such as Halo Business Park, by St Mary Cray?
Yes. Estates, retail parks and business parks around St Mary Cray, Halo Business Park among them, are all within reach. Send details of the unit and the work through our quote form for a quick quote.
Do you take on jobs in St Mary Cray where loading and access are tightly controlled?
Yes. Inductions, permits and timed loading are routine for us in London. Say when the building is occupied and when it’s quiet, and we will plan accordingly.
What causes movement joint sealant to fail?
The way it has failed typically tells us why: a split through the middle points to over-stretching, while peeling from one face points to preparation or primer. Broken edges are a third possibility.
Do you use silicone or polyurethane in movement joints?
It depends on the movement, exposure and traffic. Low-modulus neutral-cure silicone suits many facade joints, while polyurethane is common in trafficked floor and deck joints.
Can you handle several sites?
Yes. Multi-site work and planned programmes are a core part of the service, with each site phased to suit its occupants.
Can you work while the building is occupied?
Yes, as long as we plan it. Tell us your site hours and access windows and we’ll plan around them.
How long do sealant joints last?
It depends on movement, UV and weather, cleaning, traffic and the product. Sealant joints are maintenance items, so inspect them regularly.
Expansion joint sealing in St Mary Cray
We cover the full range of movement joints: vertical joints in brick and block facades, joints between precast or cladding panels, concrete slab and deck joints, ramps, podiums and internal floors. The product depends on the movement, the weather and anything that runs over it. We work on brickwork movement joints, blockwork control joints and podiums and floor movement joints, and the usual reasons a site gets in touch are previous reseals laid over old sealant and joints where the bead has lost adhesion. Whether you call it commercial sealant work, mastic application or joint sealing, the work in St Mary Cray is the same: the right product in a properly prepared joint.
Areas such as a loading bay or car park deck in St Mary Cray usually have to stay in use. We work through joints a section at a time, closing small areas in turn, at times agreed with the building manager.
Our workmanship is guaranteed for 12 months. If a joint we sealed fails because of how it was installed, we come back and put it right.
- Where
- St Mary Cray (BR5, BR6, BR7)
- Region
- Greater London
- Guarantee
- A 12-month guarantee
- Quote
- Fixed quote, scope in writing
- Call
- 01277 525 020
- Updated
- 3 November 2026
Doing it in-house
Certain joints really need a specialist: for instance fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. A poor seal in places like these tends to cost more to put right later.
Paperwork matters too. Many sites expect CSCS cards, RAMS and proof of insurance, and our CSCS-carded applicators are used to working under those rules.
What we are called out for in St Mary Cray
The edges of the material can fail rather than the sealant. If the edge of the joint is friable, the bond fails with it so edge repair has to come before resealing.
What tends to prompt an enquiry:
- Arrises breaking up along floor joints
- Expansion joints filled with dirt and stones
- Water getting into the wall through a failed joint
- New sealant over old, now failing
Parks like Halo Business Park, under half a mile to the east of St Mary Cray, combine paved areas, car parks and building elevations, each with joints that move.
Questions to ask before you book
- How the existing material will be dealt with
- Proof of insurance
- Their plan for phasing and protecting the area
- Is depth set with backing rod, or bond-breaker tape in shallow joints?
For managing agents and facilities managers
Agents, factors and owners’ representatives all follow the same route: send the details, accept a fixed quote, and we carry out and guarantee the work. We can agree access arrangements and keyholder contacts beforehand.
When you manage a building on behalf of an owner, you need clear quotes and clear reporting. You get a fixed quote, an agreed scope and a walk round at the end.
How a job runs
We follow your site rules from the start: sign-in, induction and whatever permit system the building uses. With the paperwork done, we take the joints in the sequence agreed with you, and each area is checked before we leave it. Most London premises stay occupied while we are on site, so we agree zones and timings with the building or facilities manager. 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.
Before we start on site
- Tell us which areas need to stay in use
- Let building users know which areas are affected
- Point out parking and an unloading spot
Ask for a quote
A handful of photographs and a postcode is the fastest way to a quote. Send them through the quote form, or speak to us on 01277 525 020 or email us to discuss it first.
Related advice
Why it’s worth doing now in St Mary Cray
Resealing is usually the answer, not replacing the element. Where the edges are sound, cutting out and resealing is enough. We’ll flag where edges need repair before sealing. Repeat call-outs disrupt occupied London buildings, so cutting the old sealant out fully and doing it right once is the better route.
Pricing movement joints depends on quantities, condition and access, and any specification that applies. Call for a quote.
Why us?
- Old sealant cut out, never sealed over
- Colours chosen to suit frames, cladding or finishes where possible
- Sealing commercial buildings since 2005
- Constructionline member
Take a look at our cost guide or how we’re accredited.
Places near St Mary Cray
More services for St Mary Cray
Different surfaces, different methods
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.
Podium joints
Podium joints often sit within a waterproofing system. Where the specification calls for sealant, we reseal, and tell you if the problem looks like the waterproofing below.
Traffic, movement and joints around St Mary Cray
The 3 miles around St Mary Cray take in at least three named trading estates, business parks or retail parks. Floors, loading bays and yards on sites like these are where floor and movement joints work hardest. Few London car parks or loading bays can be taken out of use for more than a short spell, which is why we work a few bays at a time.
A campus such as University of Greenwich Avery Hill Campus (4 miles north of St Mary Cray) has long runs of movement joint in its buildings, decks and paving. Sites like Queen Mary's Hospital, 1.9 miles north of St Mary Cray, carry ambulances, deliveries and visitors’ cars over their road and deck joints.
St Mary Cray is about 11 miles south-east of London, in Greater London. If you are looking for expansion joint sealing in St Mary Cray, we can help, as we do across Greater London. 764 places across Greater London fall within our area, including St Mary Cray. For work in that direction, see our London page (11 miles or so).
Work on movement joints is covered throughout BR5, BR6 and BR7. Buildings on New Road, Kent Road and Park Road are within our area. You’ll find St Mary Cray on or near the A224. We also cover Poverest (1 mile south-west), St Paul's Cray (1 mile north), Orpington (1 mile south), Derry Downs (1 mile south-east) and Kevington (1 mile east) for movement joints. Nearby towns on our patch include London (11 miles north-west), City of Westminster (14 miles north-west), Marylebone (14 miles north-west), Kensington (15 miles north-west), St Pancras (13 miles north-west) and Shoreditch (12 miles north-west).
What’s near St Mary Cray
In St Mary Cray, that means premises near Harris Academy Orpington, The Blue Anchor Public House and Walsingham School and the streets around them. There’s a railway station in St Mary Cray itself: St Mary Cray station. A little further out are London Borough of Bromley Museum (0.9 miles south) and Lullingstone Castle (4.5 miles south-east). For a walk, there’s Summer Hill and The Warren.