New York City, NY – Wisko America, Inc. is waterproofing the entire New York subway tunnel from Madison Avenue to 2nd Avenue along 48th street. The New York City Subway is the longest rapid transit system in the world with 469 stations and 233 miles of tracks. The subway system delivered 1.76 billion total rides in 2015. Because the system is up to 100 feet underground, it is important to protect the structural concrete from water below the city. Wisko is installing Sika Greenstreak waterproofing products along the half-mile of tunnel, two platform areas, and several cross-passages.
Wisko Supervisor Bruno Raposo walked us through the underground tunnel to review this exciting project. The east and west platforms at the entrance of the tunnel are nearly finished, as the concrete has already been poured over the FUKO Re-Injectable Hose System. Both corridors span several hundred yards across with 50 foot archways. The same FUKO system is used along the length of the tunnel to waterproof the subway line. Bruno explained to us that the Sika Greenstreak geomembranes are centered over the expansion joints of the concrete. Since the expansion joints are the weakest part of the concrete, a centered membrane allows an optimal injection of epoxy if any leaks occur. Since the concrete pours are 60 feet across and the membranes are 30 feet across, each expansion joint can be perfectly covered.
In the tunnel we saw Rafael Echeverria, who is also the Supervisor of the Seattle Light Rail project that we visited earlier in the trip. Rafael explained to us that Sikadur is used to secure concrete supply pipes for the tunnel. The 20 inch service pipes allow concrete to be delivered from street-level. After seeing two of Wisko’s waterproofing projects, we learned that the concrete below Seattle and New York is well protected.