demolition signs:

Demolition Signs are required for new construction and restoration.

Construction of a new building or demolition of an existing structure is also required to install bridging the necessity to erect such a sidewalk bridge is dependent upon the height of the building being repaired. New York City a Sidewalk Bridge is required when construction work is over 40 feet high or 25 feet high for demolition work and whenever there is a dangerous condition irrespective of the height. A sidewalk shed must be erected whenever materials will be hoisted over the sidewalk, regardless of building height or horizontal distance between building and sidewalk. permit is required prior to erecting a sidewalk shed or supported scaffold over 40 feet in height. If a scaffold is on top of a sidewalk shed, the height of the scaffold must include the height of the shed and be taken from the top of the sidewalk. If the supported scaffold is located on a setback or roof of a building, and if the outer leg of the scaffold is located a distance less than half the height of the scaffold (from the top of roof or floor slab), the height of the scaffold for permitting purposes shall include the height of the building below prior to erecting a sidewalk shed, an owner must obtain a permit from DOB.

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