Address: 201 East 93rd Street, New York, NY
Building Type: Commercial
Client: Related Management
Technical Consultant: Vidaris, Inc.
Prior to the arrival of CGI technicians at 201 East 93rd Street, water was entering the elevator pit through a horizontal foundation wall cold joint approximately 3 feet above the floor slab. At first, it was reported that there was a 12 LF cold joint at which the water was entering, but upon visual inspection of the elevator pit area, it was deemed that there was a total of 30 LF of cracks and or cold joints which needed to be addressed with the CGI waterproofing system.
Several months after our waterproofing injections remediated the below-grade water intrusion within the foundation walls cracks and cold joints, ponded water was seen on elevator pit’s floor slab. Upon further inspection, we found that all foundation walls were dry leading our team to determine that the new water was finding its way through the floor slab to the bottom of the walls interface of the pit and floor slab cracks. As the concrete floor slab is situated on top of soil and is at the lowest building elevation, the exterior footing to floor slab interface is a typical water intrusive culprit, which allows water to penetrate and migrate through the interior floor to wall interface. Upon waterproofing within this perimeter floor slab to wall interface, the groundwater intrusion was completely eliminated with no further groundwater entry points from within any floor slab hairline crack.