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footing systems shall be permitted. <br /> Exception:Where expansive,compressible,shifting or other questionable soils are present,surrounding soils shall not be <br /> relied on for lateral support. <br /> R507.5 Deck Beams <br /> Maximum allowable spans for wood deck beams,as shown in Figure R507.5,shall be in accordance with Tables R507.5(1) <br /> through R507.5(3).Beam plies shall be fastened with two rows of 10d(3-inch x 0.128-inch)nails minimum at 16 inches(406 <br /> mm)on center along each edge.Beams shall be permitted to cantilever at each end up to one-fourth of the allowable beam <br /> span.Deck beams of other materials shall be permitted where designed in accordance with accepted engineering practices. <br /> Table R507.5 is not adopted.See Tables R507.5(1),R507.5(2)and R507.5(3). <br /> _- M 1 : ems- <br /> - (TAM' 1 Ski `-9F,4#e I i <br /> ppf <br /> 4. <br /> t <br /> z <br /> S=r1 tvi'd. g AM sPhtt @E M SPAN OPTION,641 OPTIONAL BE-M SPAN DEW SPAN <br /> L 4 1 Ga'ER. Cr1NDIEYEi? it 014FUtR C.6 <br /> DROPPED SEAM FLUSH 8E,tM <br /> FIGURE R507.5 <br /> TYPICAL DECK JOIST SPANS <br /> TABLE R5075(1) <br /> MAXIMUM DECK BEAM SPAN-60 PSF LIVE LOAD OR 70 PSF GROUND SNOW LOAD <br /> 11 1C3I\ <br />