3308.1 Safety Netting During Construction or Demolition Operations

When in the course of construction the building reaches a height of 4 stories or 40 feet (12 192 mm), vertical safety netting shall be maintained at each story except at the story at grade, the story immediately above the sidewalk shed and the roof level where a parapet is installed.

When exterior walls are being constructed, altered or repaired at a height greater than 6 stories or 75 feet (22 860 mm), horizontal safety netting shall be provided on the sides of the structure where the structure is not enclosed. A structure shall be considered to be enclosed when the permanent facade is completed except for the windows. Such windows shall be protected to a height specified in Section 3308.3 unless there is a sill not less than 2 feet 6 inches (762 mm) in height and vertical mullions or piers with a maximum opening of 5 feet (1524 mm) and a non-corrosive wire cable capable of withstanding a load of at least 200 pounds (90.7 kg) applied in any direction except upward.

When during the course of construction the building reaches a height of 6 stories or 75 feet (22 860 mm), horizontal safety netting shall be maintained at a level not more than two stories or 30 feet (9144 mm) below the stripping operation on concrete structures or the uppermost finished (and walkable) concrete floor on steel frame structures. The horizontal safety netting may be removed after the formwork for the topmost level of concrete is removed or after the topmost level of concrete for a steel building is poured.

When demolition of the exterior walls or the roof of a structure occurs at a height greater than 6 stories or 75 feet (22 860 mm), horizontal safety netting shall be provided. The horizontal safety netting shall be constructed and maintained not more than two stories or 30 feet (9144 mm) below the story from which the exterior walls and roof are being removed until the demolition has progressed to within six stories or 75 feet (22 860 mm) off the ground or adjoining roof level

When tarpaulins encase one or more floors immediately below the finished concrete floor in order to maintain temporary heat, the horizontal nets may be located no more than three floors below the finished concrete floor.

Required horizontal safety netting may be omitted in designated crane and derrick lifting areas so long as such lifting area is as indicated on the crane application and on the site safety program.