§ 4-153. Fire and Smoke Protection Features; Section 704, Fire-Resistance Rating of Structural Members.

(a)

Section 704.14 is added to read as follows: "Protection of Truss Framing Members." All combustible truss framing members which comprise a portion of a nonrated floor assembly shall be protected by the installation of a ceiling. The ceiling material shall not be less than one-half (1/2) inch gypsum board or an approved equivalent alternative material. The ceiling must be adequately supported by direct mechanical fastening to the structural framing or be suspended by not less than No. 12 MSG galvanized steel wire or by an equivalent method. Where combustible truss joist framing is used as a portion of a required rated floor-ceiling assembly, the structural members shall be protected in accordance with an appropriate tested and listed design.

Exceptions:

1.

Buildings protected throughout, excluding crawlspaces less than forty-two (42) inches in depth by an automatic sprinkler system; and

2.

Crawl spaces of not more than forty-two (42) inches in depth, measured from the top of the floor surface above to the surface of the crawl space floor.

(CB-121-1985; CB-97-1989; CB-98-1991; CB-63-1995; CB-82-1998; CB-54-2002; CB-13-2009; CB-45-2012)