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Under many older New York City storefronts and walk-ups sits a room most pedestrians never think about. A sidewalk vault is the part of a building that extends past the property line and under the public sidewalk. Some hold boilers and fuel tanks. Some hold storage. Some started life as coal rooms and have sat empty for years. Overhead, a structural roof carries the load. In some older vaults the sidewalk slab itself is that roof. In others, the concrete walking surface sits

A GC bidding public work in New York usually encounters M/WBE requirements before the contract is awarded. The solicitation establishes the participation goal, and the utilization plan shows how the bidder intends to meet it. Those decisions often have to be made while the estimate and subcontractor buyout are still taking shape. New York City, New York State, and the Port Authority of New York and New Jersey each run a separate certification program with its own goals, its o

Nobody compliments a sidewalk. There is no version of walking down a street in Queens or Brooklyn where a pedestrian stops, looks down, and thinks about the concrete. The only time anyone notices a sidewalk is when something has gone wrong with it. A flag that rocks underfoot. A puddle that never drains. A lip between two slabs that catches a toe. That is the strange standard this work carries. Success is invisibility. A sidewalk that performs correctly for years generates no

Spray-applied fireproofing is one of the final scopes completed before a building is ready for inspection. It is also one of the first things inspectors scrutinize. If the fireproofing fails inspection, the project can stall even when every other trade has finished its work. That happens more often than many project teams expect, and almost always for the same reason: the fireproofing was treated as a spray operation instead of a coordinated fire protection system. Spray-appl

Most construction projects have the luxury of an empty building. The crew shows up, the space is theirs, and the work proceeds on its own schedule. Occupied building construction is a different situation. The patients are still in the rooms down the hall. The students are still in class on the floor above. The government office is still processing applications two corridors away. Working in that environment is not simply a matter of being careful. It requires a fundamentally

When the Battery Park City Authority needed to protect the Museum of Jewish Heritage from storm surge without blocking its views of New York Harbor, the engineering answer was a 250-foot flood barrier topped with toughened glass. It was the first flood wall of its kind in New York City, and only the second in the United States. 4D Construction, Inc. was the contractor that built it. That project, completed as part of the $298 million South Battery Park City Resiliency Project