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8.A. - Page 14 <br /> Section R905.1.1. Minimum Class B Roof Covering. Roof coverings shall be either <br /> Class A or Class B roof assemblies. <br /> Secs. 9.44 - 9.51. RESERVED. <br /> Sec. 9.52. SECTION 1907 OF THE BUILDING CODE AND SECTION R506.1 OF THE <br /> RESIDENTIAL CODE AMENDED: Both Section 1907.1 of the Building Code and Section <br /> R506 of the Residential Code are hereby amended to read as follows: <br /> Section 1907.1, R506.1. Concrete Slabs on Grade. This section shall apply to <br /> concrete slabs on grade in construction related to Groups R and U occupancies <br /> only. <br /> Sec. 9.53. SECTION 1907 OF THE BUILDING CODE IS AMENDED TO ADD SECTION <br /> 1907.1.1. Section 1907 of the Building Code is amended to add a new Section 1907.1 to <br /> read as follows: <br /> Section 1901.1.1. Concrete slab floors. Concrete slab floors, garage slabs, and <br /> driveways shall have a minimum thickness of three and one -half (3 1/2) inches and <br /> shall be reinforced with a minimum six (6) inch by six (6) inch by six (6) gauge <br /> welded wire fabric or equivalent area of reinforcing. Welded wire fabric <br /> manufactured in mats shall be used. All reinforcement shall be appropriately <br /> supported in order to keep the reinforcement in the mid -depth of the slab until the <br /> completion of the concrete pour. <br /> Under habitable rooms of Groups R occupancies, a vapor barrier approved by the <br /> Building Official shall be installed beneath the concrete slab floor. Single -ply plastic <br /> vapor barriers shall not be used. An approved base material of suitable <br /> consistency, compaction, and thickness shall be provided directly under the <br /> concrete slab vapor barrier to retard capillary action. Two (2) inches of sand shall <br /> be provided between the vapor barrier and the concrete slab. The top of the <br /> concrete floor slab shall be a minimum six (6) inches above exterior finished grade. <br /> Sec. 9.54. SECTION R506.2 OF THE RESIDENTIAL CODE AMENDED: Section R506.2 <br /> of the Residential Code is amended to read as follows: <br /> R506.2. Concrete slab floors. Concrete slab floors, garage slabs, and driveways <br /> shall have a minimum thickness of three and one -half (3 1/2) inches and shall be <br /> reinforced with a minimum six (6) inch by six (6) inch by six (6) gauge welded wire <br /> fabric or equivalent area of reinforcing. Welded wire fabric manufactured in mats <br /> shall be used. All reinforcement shall be appropriately supported in order to keep <br /> the reinforcement in the mid -depth of the slab until the completion of the concrete <br /> pour. <br /> Under habitable rooms of Groups R occupancies, a vapor barrier approved by the <br /> Building Official shall be installed beneath the concrete slab floor. Single -ply <br /> ATTY /ORD.398 /BUILDING CODE ADOPTION <br /> REV: 11 -22 -13 JS <br /> Page 3 of 9 <br />