Address: One World Trade Center, 285 Fulton Street , New York, NY
Building Type: Commercial
Location: Oil Tank Room
Owner: The Durst Organization
General Contractor: Tishman Construction
In the C4 Level Broadcast Tank Room, the south facing concrete foundation wall was showing signs of active below-grade water infiltration along with signs of previous water staining and efflorescence. Upon review, our team found vertical foundation wall cracks that started at the floor slab and continued upward on the wall, in addition to several locations with 3/4-inch diameter holes that were actively leaking. As a result of the structural defects, ponding of water was found on the floor slab on grade. The elevation of the cracks and holes were well within the groundwater table and under tremendous hydrostatic pressure as this C4 Level was at least 50 feet below-grade and very thick, as this structural wall was necessary to support the Freedom Tower above.
It was very critical that these actively leaking locations were rectified so that the specialized epoxy floor slab coating could be properly applied to a dry surface. These water entry points were successfully resolved using the CGI waterproofing system where our specialized pumps created the necessary pressure output of over 3,000 psi for the two-component gel to penetrate full depth toward the exterior side. Thus, the resulting gel was able to reach deep within the cracks and the holes for a complete waterproofing seal. Consequently, the general contractor was able to perform the application of the specialized epoxy coating effectively.