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01/13/2014 Sec. 9.43. SECTION R905.1.1 OF THE RESIDENTIAL CODE ADDED: Section R905.1.1 of the Residential Code is hereby added to read as follows: Section R905.1.1. Minimum Class B Roof Covering. Roof coverings shall be either Class A or Class B roof assemblies. Secs. 9.44 - 9.51. RESERVED. Sec. 9.52. SECTION 1907 OF THE BUILDING CODE AND SECTION R506.1 OF THE RESIDENTIAL CODE AMENDED: Both Section 1907.1 of the Building Code and Section R506 of the Residential Code are hereby amended to read as follows: Section 1907.1, R506.1. Concrete Slabs on Grade. This section shall apply to concrete slabs on grade in construction related to Groups R and U occupancies only. Sec. 9.53. SECTION 1907 OF THE BUILDING CODE IS AMENDED TO ADD SECTION 1907.1.1. Section 1907 of the Building Code is amended to add a new Section 1907.1 to read as follows: Section 1901.1.1. Concrete slab floors. 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. Under habitable rooms of Groups R 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 thickness shall be provided directly under the concrete slab vapor barrier to retard capillary action. Two (2) inches of sand shall be provided befinreen the vapor barrier and the concrete slab. The top of the concrete floor slab shall be a minimum six (6) inches above exterior finished grade. Sec. 9.54. SECTION R506.2 OF THE RESIDENTIAL CODE AMENDED: Section R506.2 of the Residential Code is amended to read as follows: R506.2. Concrete slab floors. 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 ATTY/ORD.398/BUILDING CODE ADOPTION ORD.#2403 REV:11-22-13 JS FORMERLY MUFF#305 Page 3 of 9