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3 Prohibited in Seismic Zones 3 and 4. 4 Includes precast concrete conforming to Section 1921.2.7. s Prohibited in Seismic Zones 3 and 4, except as permitted in Section 1634.2. 6 In Seismic Zones 3 and 4 Steel IMRF, OMRF and Ordinary Braced Frames are permitted as follows: a) Steel IMRF are permitted for structural systems 35 feet or less in height and the dead load of the roof, walls or floors not exceeding 35 psf each; or for single-story buildings 60 feet or less in height with the dead load of the roof or walls not exceeding 15 psf each where the moment joints of field connections are constructed of bolted end plates; or single-family dwellings using light frame construction with R = 3.0 and Qo = 2.2. b) Steel OMRF are permitted for buildings 35 ft or less in height with the dead load of the roof, walls or floors not exceeding 15 psf each; or single-story buildings 60 ft or less in height with the dead load of the roof or walls not exceeding 15 psf each and where the moment joints of field connections are constructed of bolted end plates. c) Steel Ordinary Braced Frames are permitted for structural systems 35 ft or less in height; or penthouse structures; or single-story buildings 60 ft or less in height with the dead load of the roof or walls not exceeding 15 psf each. 7 Total height of the building including cantilevered columns. 8 Prohibited in Seismic Zones 2A, 2B, 3 and 4. See Section 1633.2.7. Sec. 9.72 SECTION '1915.2.2 OF THE BUILDING CODE AMENDED: Section 1915.2.2 of the Building Code is hereby amended to read as follows: Section 1915.2.2 Base area of footing or number and arrangement of piles shall be determined from the external forces and moments (transmitted by footing to soil or piles) and permissible soil pressure or permissible pile capacity selected through principles of soil mechanics. External forces and moments are those resulting from the load combinations of Section 1612.3. Sec. 9.73 SECTION 1922.10.3 OF THE BUILDING CODE AMENDED: Section 1922.10.3 of the Building Code is hereby amended to read as follows: Section 1922.10.3 Concrete Slabs on Grade. This section shall apply to concrete slabs on grade in construction related to Groups R-l, R-3, and M occupancies only. Section 1922.10.3.1 Concrete slab floors, garage slabs, and driveways shall have a minimum thickness of three and one-half (3 1/2) inches and shall be reinforced with a minimum six (6) inch by six (6) inch by six (6) gauge welded wire fabric or equivalent area of reinforcing. Welded wire fabric manufactured in mats shall be used. All reinforcement shall be appropriately supported in order to keep the reinforcement in the mid-depth of the slab until the completion of the concrete pour. Section 1922.10.3.2. Under habitable rooms of Groups R-1 and R-3 occupancies, a vapor barrier approved by the Building Official shall be installed beneath the concrete slab floor. Single-ply plastic vapor barriers shall not be used. An approved base material of suitable consistency, compaction, and Atty/Ord/Ord.167 102402 13 2241