Fire Retarding Construction
The Board of Standards and Appeals, New York City, at its last meeting adopted an amendment to the Rules for Fire Retarding Construction, which reads as follows:
Floor Covering.—Any one of the following forms of construction shall be accepted as fire retarding for the covering of the upper sides of wood floor beams in joisted floor construction in non-fireproof buildings used as garages, motor vehicle repair shops or oil-selling stations: (a) Seven-eighths inch wood underflooring protected with a membrane of two-ply waterproofing covered with not less than two and one-half inches of 1:2 1/2:5 concrete or better, reinforced with not less than one-fourth of 1 per cent, of steel mesh; (b) two and one-half inches of 1:2:4 concrete applied directly to the top of the joists, with or without temporary support, reinforced with not less than one-fourth of 1 per cent, steel rods, mesh or steel lath, and having the tops of the joists coated with approved waterproof paint or protected by tar paper on the top and on the sides, for a distance of three inches from the top. The new rule becomes effective November 28, 1917.
The rules to which the above is an amendment were adopted by the board August 30, 1917, and became effective September 26, 1917.