C1-57. Chimneys, general – CBC 33102.3.6.

Section 3707(f) of the Uniform Building Code, Height and Termination, is amended to read:

1. Every chimney shall extend above the roof and the highest elevation of any part of a building as shown in Table No. 31-B. All chimneys attached to any appliance or fireplace that burns solid fuel shall be equipped with an approved spark arrester. The net free area of the spark arrester shall be not less than four times the net free area of the outlet of the chimney. The spark arrester screen shall have heat and corrosion resistance equivalent to 12-gauge wire, 19-gauge galvanized wire, or 24-gauge stainless steel. Openings shall not permit the passage of spheres having a diameter larger than 1/2 inch and shall not block the passage of spheres having a diameter of less than 3/8 inch.
   
   
2. When the valuation of an addition, alteration or repair to an existing Group R Occupancy exceeds $1,000.00 and a permit is required, a spark arrester shall be installed to the existing chimney in accordance to subsection (a) above.
   
   
3. Prior to January 1, 1992, all existing chimneys shall be fitted with spark arresters whether or not any addition, alteration, or repair has been done on a Group R Occupancy.