415.11.5.1 HPM rooms and gas rooms.

HPM rooms and gas rooms shall be separated from other areas by fire barriers constructed in accordance with Section 707 or horizontal assemblies constructed in accordance with Section 711, or both. The fire-resistance rating shall be not less than 2 hours where the area is 300 square feet (27.9 m 2 ) or more and not less than 1 hour where the area is less than 300 square feet (27.9 m 2 ).

415.11.5.2 Liquid storage rooms.

Liquid storage rooms shall be constructed in accordance with the following requirements:

   1.   Rooms greater than 500 square feet (46.5 m 2 ) in area, shall have no fewer than one exterior door approved for Fire Department access.

   2.   Rooms shall be separated from other areas by fire barriers constructed in accordance with Section 707 or horizontal assemblies constructed in accordance with Section 711, or both. The fire-resistance rating shall be not less than 1 hour for rooms up to 150 square feet (13.9 m 2 ) in area and not less than 2 hours where the room is more than 150 square feet (13.9 m 2 ) in area.

   3.   Shelving, racks and wainscotting in such areas shall be of noncombustible construction or wood of not less than 1-inch (25 mm) nominal thickness or fire-retardant-treated wood complying with Section 2303.2.

   4.   Rooms used for the storage of Class I flammable liquids shall not be located in a basement.

415.11.5.3 Floors.

Except for surfacing, floors of HPM rooms and liquid storage rooms shall be of noncombustible liquid-tight construction. Raised grating over floors shall be of noncombustible materials.

415.11.5.4 Location.

Where HPM rooms, liquid storage rooms and gas rooms are provided, they shall have no fewer than one exterior wall and such wall shall be not less than 30 feet (9144 mm) from tax-lot lines, including tax-lot lines adjacent to public ways.