Record time waterproofing at King’s Cross Station

Record time waterproofing at King’s Cross Station

Flexcrete’s Cementitious Coating 851 was chosen to waterproof the mass pour concrete roof of the plant room in King’s Cross Station due to its fast cast and waterproofing qualities.


Opened in 1852, King’s Cross Station now handles 47 million passengers a year and is famous as the departure point for the Hogworts’ Express in the Harry Potter films.

To prepare for the 2012 Olympics, £400m has been allocated for upgrading, with the Eastern Range being converted into offices for 400 staff utilising much of the original structure. Located under the original roof, newly constructed plant rooms required a permanent waterproofing system.


JV Contractor Laing O’Rourke Costain chose Cementitious Coating 851 following its successful application over green concrete at Heathrow T5. After pouring the slab, it was left to cure overnight before preparing with a stiff brush and thorough soaking. To prevent outgassing, Cemprotec EF Primer was applied, a fillet was installed around the perimeter with Fastfill and Cementitious Coating 851 was laid at 2mm thickness. Cemprotec EF Grit was cast into the surface to give a slip resistant finish. Within the space of 4 days, the slab was cast and waterproofing completed in record time, with heavy machinery installed just a few days later.

Add to Project Board

Create a new project board:

View Waterproof Protective Coatings Product Entry
Flexcrete Technologies

Flexcrete Technologies

Flexcrete Technologies Limited is the UK’s leading independent manufacturer of technical mortars and high performance coatings. With origins dating back to 1983, they are a technology-driven company with an track record of setting industry...
View company profile

Make an enquiry to Flexcrete Technologies

You may also be interested in this related Case Study: Flexcrete refurbishes the tank area at iconic brewery Read Now