Live load rating The structural capacity measurement specifying the maximum weight that a structurally supported sidewalk or vault cover can safely hold.
To ensure public safety, the NYC Building Code requires all structurally supported sidewalks and vault covers to meet a minimum live load rating of 600 pounds per square foot. This stringent standard is designed to withstand not only dense pedestrian crowds but also heavy emergency vehicles that may accidentally mount the curb. Licensed engineers must calculate and certify these ratings before any sidewalk construction or vault alteration permits are approved by the Department of Buildings. Failure to maintain this load capacity can result in catastrophic structural failure, especially if heavy construction equipment or delivery vehicles park over the hollow space.
Frequently Asked Questions About Live load rating
What is a live load rating?
The maximum weight per unit area that a structurally supported sidewalk or vault cover can safely carry.
What rating applies in NYC?
The Building Code sets a minimum live load requirement for structurally supported sidewalks and vault covers, commonly cited as 600 pounds per square foot. Confirm the current code requirement for your project.
Why is the requirement so high?
To account for dense pedestrian crowds and for emergency or delivery vehicles that may mount the curb.
Who certifies the rating?
A licensed engineer, whose calculations support the permit application before construction or alteration.
What is the danger of exceeding it?
Structural failure, particularly when heavy equipment or a delivery vehicle parks over the hollow space.