Ordinance 4321 - Laserfiche WebLink

• E. Underdeck. • All substructures of combustible construction shall have the under- deck area subdivided by: I. Transverse fire walls at intervals not exceeding 450 feet. Such walls shall constitute a continuation of the fire walls in the super- structure and the maximum areas under such spacing shall not exceed 50, 000 square feet. Walls shall be free of holes and shall extend to low water line. Where aprons or platforms are built along the sides of the pier, fire walls shall extend to the outside edge of such platforms, said substructure fire walls shall have a fire resistance rating of at least four (4) hours. II. Transverse fire stops shall be located between fire walls. Spacing between fire walls and fire stops or between fire stops shall not exceed 150 feet. Fire stops shall fit tightly up against the pier deck and around any structural members or pipes that pass through the fire stop so that an effective barrier to fire and draft will be maintained. Fire stops shall extend to low water line. Where aprons or platforms are built along the sides of the pier, fire stops shall extend to the outside edge of the platforms or aprons. Said substructure fire stops shall be constructed of six (6) inches of reinforced concrete or they may be of wood planking built up to a thickness of four (4) inches and securely fastened to the piles, or of steel plate - inch thick or other construction approved by the Chief of the Fire Department, provided that each side of wood or exposed metal fire stops are protected by automatic sprinklers or by openings in the pier deck through which revolving nozzles and other devices may be used to form an effective water curtain. F. Catwalks. There shall be maintained under each pier of a combustible sub- structure, catwalks for the use of firemen, and they shall comply with the following requirements: I. Catwalks shall he placed only under piers and wharves where there is at least five (5) feet from bottom of pier to high water. II. Catwalks shall be placed at least four (4) feet from the bottom of the pier or wharf, and be at least two (2) feet wide. III. There shall be one catwalk for each 50 feet of pier or wharf width. IV. There shall be manholes on each side of fire walls and fire stops for access to the catwalks. Sectio: 6. Fire-Resistive Funerstructures. Fire-resistive superstructures, as defined in this ordinance, shall be of four (4) hour fire-resistive construction throughout and shall comply with the following specific requirements: Ordinance -5-