410.4 Platform construction.
BC § 410.4
Permanent platforms shall be constructed of materials as required for the type of construction of the building in which the permanent platform is located. Permanent platforms are permitted to be constructed in accordance with the following: 1. The area below the platform shall be enclosed on all sides with solid construction.
2.Platforms constructed of untreated wood shall not exceed an area of 400 square feet (37 m 2 ). Platforms constructed of fire retardant treated wood shall not exceed an area of 1,200 square feet (111 m 2 ). Platforms constructed of noncombustible materials shall not be limited in area.
3.Where wood is used, the floor of the platform shall be a least 1 inch (25 mm) nominal thickness. Such floor shall be laid on a solid, noncombustible backing, or shall have all spaces between supporting members fire blocked with noncombustible material. Where the space beneath the permanent platform is used for storage or any other purpose other than equipment, wiring or plumbing, the floor construction shall not be less than 1-hour fire-resistant construction. Where the space beneath the permanent platform is used only for equipment, wiring or plumbing, the underside of the permanent platform need not be protected.
