AgdaPkt 2013-12-09 Special - Laserfiche WebLink

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4.4.B. - Page 17 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 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 between 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. 9.55 SECTION 2308.9.3, ITEMS 5 AND 7 OF THE BUILDING CODE AMENDED: Section 2308.9.3, Items 5 and 7 of the Building Code is amended to delete Item 5 of that section which did allow the use of gypsum board for bracing and to amend Item 7 of that section to read as follows: Section 2308.9.3. Conventional Light-Frame Construction Provisions (Bracing) are amended as follows. Item 5: Delete Section 2308.9.3, Item 5. Item 7: Portland cement plaster on studs spaced 16 inches (406mm) on center installed in accordance with Section 2510. Limited to one-story structures of R and U occupancies. Sec. 9.56. TABLE R602.10.4 OF THE RESIDENTIAL CODE AMENDED: Table R602.10.4 is amended to delete Item GB of that table which did allow the use of gypsum board for bracing and to amend Item PCP to read as follows: . Item PCP, Material Column: Portland cement plaster limited to one-story structures of R and U occupancies. Sec. 9.57. SECTION 903.2 OF THE BUILDING CODE AMENDED: Section 903.2 of the Building Code is hereby amended to read as follows: Section 903.2 Where required. Approved automatic sprinkler systems shall be required as provided in Article II of Chapter 12 of the Redwood City Municipal Code for specific requirements. Such sprinkler systems shall also be provided in ATTY/ORD.398/BUILDING CODE ADOPTION REV: 11-20-13 JS Page 4 of 10