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20.08.055 Section 1910.1 amended -Minimum Slab Provisions. Section 1910.1 of the California Building Standards Code 2007 Edition, (24 C.C.R.), and including by reference the International Building Code, 2006 Edition, Volumes 1 and 2 is amended to read as follows: 1910.1 General. The thickness of concrete floor slabs supported directly on the ground shall not be less than 31/2" (89mm). A 6-mil (.006 inch; .015mm) polyethylene vapor retarder with joints lapped not less than 6 inches (152mm) shall be placed between the base course or subgrade and the concrete floor slab, or other approved equivalent methods or materials shall be used to retard vapor transmission through the floor slab. As a minimum and in all cases where a slab is to be placed inside of a building the slab shall be reinforced with not less than six inches by six inches ten gauge welded wire mesh or an approved alternate installed at mid height of the slab. In slabs under habitable spaces a 4 inch (10 mm) crushed rock capillary water barrier shall be provided under the minimum 6 mil vapor retarder. A minimum of 2 inches (5 mm) of clean sand shall be placed over the 6 mil vapor retarder below the slab. (Balance of section to remain). 20.08.056 -This Section is Deleted. 20.08.057 -This Section is Deleted. 20.08.058 Section 704.5 amended -Fire-resistance ratings. Section 704.5 Fire-resistance ratings of the California Building Standards Code 2007 Edition, (24 C.C.R.), and including by reference the International Building Code, 2006 Edition, Volumes 1 and 2 is amended to read as follows: 704.5 Fire-resistance ratings. For other than high-rise buildings, Group A, E, H, 1, L and R occupancies and other applications listed in Section 111 regulated by the Office of the State Fire Marshal, and in general and for all occupancies not regulated by the State Fire Marshall exterior walls shall be fire-resistance rated in accordance with Tables 601 and 602. The fire-resistance rating of exterior walls for Groups R-2, R-3 and U occupancies with a fire separation distance of 5 feet (1524 mm) or less shall be rated for exposure to fire from both sides. All other occupancies not regulated by the State Fire Marshall with a fire separation distance of 10 feet (3048 mm) or less shall be rated for exposure to fire from both sides. For high-rise buildings, Group A, E, H, 1, L and R occupancies and other si