Several vaulted cellar level office and storage rooms were experiencing below sidewalk rainwater intrusion from many years. As the top of the structural vaulted sidewalk slab had compromised waterproofing membrane, rainwater was entering through the deteriorated sidewalk wearing slab, and finding its way through the compromised waterproofing entering through concrete cracks; and then down through the ceiling plenums below. CGI NE utilized its CGI (Concrete Gel Injection) gravity feed two-component, hydrophilic resin waterproofing system through these vaulted sidewalk expansion joints. This program was implemented on all 3 sides of this building – the 6th Avenue side and the 46th and 47th Street sides..

The procedure was as follows:
The old caulking and residue material from the sidewalk expansion joints at the leaking locations were vacuumed clean, to allow for the proper CGI two liquid component resin penetration.
Then, the apply the Aqua Loc Resin LV at the determined gel setting time, within these expansion joints to penetrate the critical areas of membrane deterioration. This application in effect created a gel seal below the walking slab to prevent water from intruding into the cellar space below. Backer rod was then inserted within these joints and then the joints were caulked with new urethane sealant.

This program proved to be a huge success and the below sidewalk rainwater intrusion was remediated.