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Ordinance No. 2241 Page 26 of 60 a. When modification to the building results in a 50%or greater increase of the total floor area of the building or brings the over total of floor area of the building to more than 8,000 square feet,the entire building shall be provided with an automatic fire extinguishing system. Exception: Additions providing accessory storage space not greater than 500 square feet in area to an existing non-fire sprinklered building or solely for the purpose of providing accessibility shall not result in a requirement that the building be provided with an automatic extinguishing system. b. When a change in occupancy classification results in an increased fire hazard or risk to business operations or increased life safety hazard of the occupants,the new occupancy and all fire areas that the new occupancy exits through shall be provided with an automatic extinguishing system. Exception: Public assembly occupancies not exceeding an occupant load of 150, whether occupying an entire building or a portion of a building. 3. Existing residential buildings not currently provided with automatic fire extinguishing systems shall be provided with an automatic fire extinguishing systems as follows: a. When a modification or modifications to the building results in a 50%or greater increase of the total original approved floor area of the building b. In the garage when a new attached or detached garage is added and the modification does not otherwise require the addition of an automatic fire protection system throughout the building. 20.24.170 CFC Section 903.3.1.2 amended—NFPA 13R Sprinkler Systems. Section 903.3.1.2.3 is amended to read: • 903.3.1.2.3 Attics.Automatic fire sprinklers shall be provided in all attic areas. 20.24.180 CFC Section 903.3.1.3 amended—NFPA 13D Sprinkler Systems. Section 903.3.1.3 is amended to read: 903.3.1.3 NFPA 13D sprinkler systems.Automatic sprinkler systems installed in one-and two-family dwellings; Group R-3; Group R-4,Condition 1; and townhouses shall be permitted to be installed throughout in accordance with NFPA 13D,as amended in Chapter 80. In addition,the fire-sprinkler system shall be designed and sprinklers shall be installed in the following additional locations: 1. Attic shall be provided intermediate temperature-rated residential fire sprinklers for detection coverage and located at a spacing equivalent to 30 feet by 30 feet centers and maximum of 15 feet from outside walls. 2. Fire sprinklers shall be provided in garages. Fire sprinklers shall be intermediate rated,quick response,with a maximum coverage of 130 square feet per sprinkler. 3. Any bathroom located under a stairway,regardless of the bathroom's size. 4. Any closet located under a stairway regardless of the closet's size or surfacing materials. 20.24.185 CFC Section 3208.3.1 amended—Flue space protection. Section 3208.3.1 is amended to read: 3208.3.1 Flue space protection. Flue spaces required by Table 3208.3 above the first tier of