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4.15 Show pier size, 14" square or 16" <br /> 4.20 Show minimum underfloor <br /> diameter, spacing and 12" depth ventilation equal to 1 square foot for <br /> into undisturbed soil. Limit spacing <br /> each 150 square feet of underfloor <br /> to support 25 sq. ft. of floor area <br /> area. Openings shall be as close to <br /> unless a greater area can be <br /> corners as practicable and shall <br /> justified. S.J.Co.Ord.#3526. <br /> provide cross ventilation on at least <br /> two approximately opposite sides. <br /> 4.16 Specify that individual concrete or <br /> Section 2306.7. Calculate required <br /> masonry piers shall project at least <br /> area and area provided. <br /> 8"above exposed ground unless <br /> the columns or posts which they 4.21 Show minimum 18" clearance from <br /> support are of approved wood of grade to bottom of floor joists and <br /> natural resistance to decay or minimum 12"clearance to bottom of <br /> treated wood is used. UBC Section <br /> girders. UBC Section 2306.3. <br /> 2306.5. <br /> 4.22 Columns and posts located on <br /> 4.17 Show blocking at ends and at <br /> concrete or masonry floors or decks <br /> supports of floor joists and floor exposed to the weather or to water <br /> trusses. UBC Section 2320.8.3. splash or in basements and which <br /> support permanent structure shall <br /> 4.18 Floor slabs shall be not less than 3- <br /> be supported by concrete piers or <br /> 112" thick and reinforced with a metal pedestals projecting 1" above <br /> minimum of 6" x 6", No. 10 gauge floors unless approved wood of <br /> welded wire reinforcing mesh. natural resistance to decay or <br /> S.J.Co.Ord.#3180. treated wood is used. UBC Section <br /> 2306.5. <br /> 4.19 If foundation cripple wall studs are <br /> less than 14",framing shall be solid 4.23 Show minimum underfloor access <br /> block or sheathed with plywood. of 18" X 24" and if through floor it <br /> UBC Section 2320.11.5. must be weatherstripped. UBC <br /> Section 2306.3. <br /> 8 <br />