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<br /> SV, .nt 12/17/87 (#06) <br /> SWC:nt 12/22/87R <br /> section shall apply to concrete slab s on grade in <br /> construction related to Groups R-1, R-3, and M <br /> occupancies only. <br /> " , (a) Concrete slab floors, garage slabs, and <br /> driveways shall have a minimum thickness of three and <br /> one-half (3~) inches and shall be reinforced with a <br /> minimum six ( 6) inch by six (6 ) inch by six (6 ) guage <br /> welded wire fabric or equivalent area of reinforcing. <br /> Welded wire fabric manufactured in mats shall be used. <br /> All reinforcement shall be appropriately supported in <br /> order to keep the reinforcement in the mid-depth of the <br /> slab until the completion of the concrete pour. <br /> " , (b) Under habitable rooms of Groups R-1 and R-3 <br /> occupancies, a vapor barrier approved by the Building <br /> Official shall be installed beneath the concrete slab <br /> floor. Single-ply plastic vapor barriers shall not be <br /> used. An approved base material of suitable <br /> consistency, compaction, and thickness shall be <br /> provided directly under the concrete slab vapor barrier <br /> to retard capillary action. Two (2 ) inches of sand <br /> shall be provided between the vapor barrier and the <br /> concrete slab. The top of the concrete floor slab <br /> shall be a minimum six (6 ) inches above exterior <br /> finished grade. ' " <br /> "Section 9.46. Section 7007, appendix Chapter 70 of <br /> the Building Code is hereby amended to read as follows: <br /> 6 <br /> - -...... <br />