Active water intrusion was evident in both the Cellar and Sub-cellar levels of the parking garage at the above referenced building location. Substantial below grade level water intrusion was witnessed rolling down the east brick vaulted structural wall, below the street curb. Most of the water entry was emerging through the top of the wall interface, directly below the street asphalt, however, there are certainly some other points of water entry at lower elevations on this C level east wall. The years of water intrusion had caused brick delaminations to occur and mortar joints to deteriorate. The Masonry General Contractor, SCS Inc., removed and replaced these bricks and cut and re-pointed the mortar joints. This re-filling and patching gave our system the solid substrate that is required for theoptimum working pressure to be established for maximum penetration of our resin-gel.

Directly below in the SC level east wall, water was seen running down from the top of the wall; from the top of the wall to structural ceiling slab interface (or floor slab of the C level). There were water entry points at this SC level elevation as well, or this water may have been residual water running down from directly above on the C level. Upon performing the successful injection waterproofing on the C level east wall and eliminating the water intrusion, then through the process of elimination, we were able to determine that there were other independent water entry points at this SC level elevation. These water intrusive locations were also successfully treated with the CGI waterproofing process and remediated.

There was also the possibility that the water may have been emerging through a cold joint where the structural concrete floor slab at the C level (the concrete ceiling slab at the SC level) meets the foundation wall. Consequently at this designated potential leaking cold joint location, the drilling/injection waterproofing was implemented from the Upper C level above (on an angle downward through the bottom of the wall to floor slab interface) and through the lower SC level below (on an angle upward through the top of the wall to ceiling slab interface). After performing these procedures, the water intrusion ceased.
There were two other areas on the north foundation concrete walls at both the C and SC levels that were exhibiting signs of active water intrusion. One of these areas was at the north C level Con Ed steam line vault and the other area was below at the SC level north elevation. These areas were corrected and the below grade water intrusion was completely eliminated.