The Mastic Doctor team standing beside their branded vans outside an office building
Greater London · England

North Cray expansion joint sealing

We carry out expansion and movement joint sealing in walls, decks and floors in North Cray and the surrounding area. Send details for a fixed quote.

  • Layers of sealant in a movement joint
  • Water dripping through deck or ramp joints
  • Torn sealant in brick or block movement joints
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Signed off, with 12 months’ guarantee.
South East, London & Scotland
Constructionline member
Fully insured: £5m PL

Expansion joint sealing near North Cray

Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.

Warehouse floors and decks around North Cray

Basement car parks and service yards in London tend to be in use all working day, which is why we work a few bays at a time. The 3 miles around North Cray take in at least three named trading estates, business parks or retail parks. That puts plenty of warehouse floors, service yards and car parks close by, all with joints under traffic.

For buildings at a park such as Old Bexley Business Park, which lies north-east of North Cray, brick and panel movement joints are easy to forget until one leaks. A campus such as University of Greenwich Avery Hill Campus, 2.8 miles to the west of North Cray, has long runs of movement joint in its buildings, decks and paving.

North Cray is about 2 miles east of Sidcup, in Greater London. Businesses, contractors and managing agents in North Cray use us for work on movement joints. North Cray is one of 764 places we cover in Greater London. For work in that direction, see our London page.

Commercial sites across DA14 are covered for movement joints. Streets here include Water Lane, North Cray Road and Leafield Lane, and sites on any of them can send details for a fixed quote. Just outside North Cray, we also work in Bexley (1 mile north), Coldblow (1 mile north-east), Ruxley (1 mile south), Blendon (1 mile north-west) and Joyden's Wood (1 mile east). A short drive away, we cover London (11 miles north-west), City of Westminster (14 miles north-west), Marylebone (14 miles north-west), Kensington (15 miles west), St Pancras (13 miles north-west) and Shoreditch (11 miles north-west).

Around North Cray

Locally, jobs take us to sites close to Foots Cray Meadows, Cleeve Park School and The White Cross pub. For rail, the closest station is Albany Park station, roughly 0.6 miles north-west of the centre. Well-known places in the area include Broadway Shopping Centre (1.7 miles north) and Bexley Hospital (1.8 miles north). Green spaces nearby include Wansunt Pit and Summer Hill.

Map of North Cray © OpenStreetMap contributors

Expansion joint sealing in North Cray

Internal floor joints take trolleys, pallet trucks and forklifts. Unsupported edges break up under wheels. We will tell you if the edges need repairing before sealing. If you are dealing with arrises breaking up along floor joints and sealant peeling off one face of the joint, we can put it right, whatever the surface. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, in North Cray it comes down to the same thing: failed joints cut out, faces prepared and the right sealant laid to the right depth.

Areas such as a loading bay or car park deck in North Cray usually have to stay in use. Joints are done in sections, with bays coned off one after another, so the site keeps operating.

We stand behind the joints we seal: 12 months, guaranteed. That covers our preparation and application.

Mastic Doctor team members lined up next to their branded vans outside an office building
Location
North Cray (DA14)
Region
Greater London
Guarantee
A 12-month guarantee
Price
Quoted before any work starts
Call
01277 525 020
Updated
3 November 2026

After the work

For the best life from the joints:

  • Inspect exposed joints once the cold weather has passed
  • Plan racking layouts so feet don’t land on a joint
  • Put movement joints on the planned maintenance inspection round
  • Keep stones and debris out of open joint lines

Floor joints on main traffic routes need watching more closely than the rest. Avoid standing heavy loads or racking legs on the joints.

Once debris packs a failed joint, the structure has nowhere to expand. The arrises crack and break away under the load. A sound seal keeps the joint working.

Why it’s worth doing now in North Cray

Combining joint work with other maintenance reduces set-up costs. Leaking joints need sealing now because damage continues. Urgent joints now, the rest later, is often the sensible plan. Repeat call-outs disrupt occupied London buildings, so a proper job first time, with the old sealant fully removed, is worth it.

There’s no price list, since every building and every scope is different. Call for a quote and we’ll price your job on its own details.

Why appoint us

  • Work to your specification and the manufacturer’s guidance
  • CSCS-carded applicators
  • CHAS accredited
  • Coloured sealants to suit the setting, where available

Take a look at what affects the cost or our accreditations and insurance.

On site: what to expect

Occupied buildings need a little choreography. We sign and contain the area we’re in, keep walkways clear and work section by section so the rest of the building stays in use. Most London premises stay occupied while we’re on site, so zones and timings are agreed with whoever manages the building. Phased work keeps the rest of the building in use.

  1. We start with photographs, approximate lengths and any drawings, visiting where needed.
  2. We compare each joint’s width with the movement and the sealant’s capability, and flag anything that needs an engineer.
  3. Every joint is cleared of the failed seal and any grit packed into it.
  4. Any broken arrises or friable edges are flagged before work goes further.
  5. The right sealant goes in at the right depth, bonded to the two sides only.
  6. Each area is handed back after its cure time, under our 12-month guarantee.

Preparing the site

  • Arrange parking or a loading space
  • Let us know about inductions and permits
  • Agree which areas must stay open

Get a fixed quote

A handful of photographs and a postcode is the fastest way to a quote. Upload them with the quote form, or ring 01277 525 020 or email us to discuss it first.

Get a quick quote

Read more

Questions we are asked in North Cray

Can you work on a hospital site such as Queen Mary's Hospital?

Yes, hospitals are one of the sectors we cover. The estates team’s permit system and infection-control rules come first, and the work is planned around them.

Do you work in London buildings with loading restrictions?

Yes, we plan every London job around the building’s own access rules. Send the building rules and access times with your enquiry. All of Greater London is inside the ULEZ, and our planning allows for it

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.

What if there’s asbestos in the old mastic?

Some older mastics, especially in pre-2000 buildings, can contain asbestos. Before we disturb old sealant in an older building, we ask to see the asbestos register or survey, and work stops until any suspect material has been tested. Removing asbestos is a job for asbestos specialists, not us.

What about RAMS and site documents?

Tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we’ll confirm with the quote.

Is colour matching possible?

In many cases, yes. Sealants are made in a wide range of standard colours, and matching to RAL references or nearby finishes is commonly requested. We confirm what’s available for the specified product when we quote.

Do you cover North Cray?

Yes. Sites across North Cray are covered.

What we are called out for in North Cray

Weathering wears down sealant on exposed elevations and decks. In time the bead chalks, stiffens and cracks and opens at the next temperature swing.

Most enquiries start with one or more of the following:

  • Debris jammed in movement joints
  • Weathered movement joint sealant that no longer flexes
  • Expansion joints split through the centre of the bead
  • Spalled or broken joint edges in floors and decks

Centres like Broadway Shopping Centre (to the north of North Cray) have mall floors and service decks whose joints carry steady traffic.

Comparing quotes

  • How the existing material will be dealt with
  • Do they follow the manufacturer’s priming guidance?
  • Who will actually carry out the work
  • The terms of the workmanship guarantee

Choosing a commercial sealant contractor

Should maintenance staff do it?

General builders and handymen seal joints, but it isn’t their main trade. A specialist prepares properly, controls joint depth and picks a product with the right movement class.

For a quick touch-up, site staff may be fine, but larger jobs are different: a specialist brings efficiency, a consistent finish and a 12-month guarantee.

Owners, agents and contractors

We work for building owners and managing agents on sealant work across single buildings or whole portfolios. Several sites can go on one quote, so there’s one set of paperwork to deal with.

FMs need a contractor who is easy to get on site. Tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we will confirm with the quote.

Accreditations

Trusted. Accredited. Insured.