North Staffordshire PFI Hospital, Stoke on Trent

Phase 3 – CSSD and USD Tunnels

All the M+E network of cables and pipes are located in underground tunnels across the site, so it was necessary to construct a 250m long tunnel to link the new CSSD block above, to the existing network of tunnels.

To enable these tunnels to be constructed within a short time frame, the contractor used the twin wall system by Kerkstoel. To ensure the structures waterproof integrity Xypex Admix waterproof concrete was used for the 160mm thick ‘infill’ core contained between the pre cast panels. Xypex Admix was also used for the in situ slab and roof.

Project specific joints were detailed which utilised Xypex Concentrate as both a slurry coat and a dry-pac, to ensure the waterproofing integrity was complete.

In addition repairs were carried out in numerous areas of the existing tunnel network where Xypex Admix hadn’t been used. Materials utilised include Xypex Patch'n Plug and Xypex Concentrate.

Download the Project Sheet PDF here

Products used

Xypex Admix


Xypex Concentrate


Xypex Concentrate

Patch'n Plug