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mesh or an approved alternate installed on approved supports at mid height of the <br /> concrete slab. <br /> Exception: A vapor retarder, sand and rock are not required: <br /> 1. For detached structures accessory to occupancies in Group R -3, such as <br /> garages, utility buildings or other unheated facilities. <br /> 2. For unheated storage rooms having an area of less than 70 square feet <br /> (6.5 m and carports attached to occupancies in Group R -3. <br /> 3. For buildings of other occupancies where migration of moisture through the slab <br /> from below will not be detrimental to the intended occupancy of the building and <br /> the rock is determined not to be needed for support or stability of the concrete <br /> floor slab. <br /> 4. For driveways, walks, patios and other flatwork which will not be enclosed <br /> at a later date. <br /> 5. Where approved based on local site conditions. <br /> In all slabs under habitable spaces, a minimum of 4 inches (102 mm) of crushed rock <br /> capillary water barrier shall be provided under the minimum 10 mil vapor retarder. The <br /> vapor barrier shall be protected by a minimum of 2 inches (51 mm) of sand, or <br /> equivalent protection. <br /> 20.08.130 CBC Table 2306.7 amended — Allowable Shear for Wind or Seismic <br /> Forces For Shear Walls of Lath and Plaster or Gypsum Board Wood Framed Wall <br /> Assemblies. <br /> Table 2306.7 is amended to read as follows: <br /> TABLE 2306.7 <br /> LATH AND PLASTER OR GYPSUM BOARD WOOD FRAMED WALL ASSEMBLIES <br /> TYPE OF MATERIAL THICKNESS OF WALL FASTENER SPACING MINIMUM b' n <br /> MATERIAL CONSTRUCTION MAXIMUM (inches) FASTENER SIZE <br /> 1. Expanded metal or woven No. 11 gage 1 -' /2" long, 7/16" <br /> head <br /> wire lath and Portland 7 /e, Unblocked 6 <br /> No. 16 gage galv, staple, 7/6" <br /> cement plaster legs <br /> 2. Gypsum lath, plain or s / lath and %" gage No. 13 a e g alv. 1 -' / long, <br /> perforated with vertical joints e" Unblocked 5 <br /> staggered plaster 19/64" head, plasterboard nail <br /> No. 16 gage galv. staple, 1 - /e" <br /> 3. Gypsum lath, plain or 3 /8" lath and " <br /> Y <br /> perforated plaster Unblocked 5 long, 0.120" nail, min. /8" head, <br /> - %" long <br /> Unblocked d 7 <br /> Unblocked C 4 <br /> 5d cooler (1 -5/8" x 0.086 ") or <br /> 4. Gypsum board, gypsum Unblocked 7 wallboard 0.120" nail, min. 3 /e" <br /> veneer base or water- Unblocked 4 head, 1 -% " long <br /> resistant gypsum backing �z No. 16 gage galv. staple, 1-% " <br /> board Blocked 7 long <br /> Blocked 4 <br /> Unblocked 8/12' No. 6-1-%" screws <br /> 36 <br />