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Purlin&Girt Calculations <br /> Purlin Calculation <br /> Roof Pitch: 4 /12 <br /> Roof Angle: 18.4 ° <br /> Greatest purlin span: 162 in <br /> Purlin Sx: 7.56 in3 <br /> Live+dead load: 30 psf <br /> Max.o.c.spacing: 16 in.o.c. <br /> M: 10,374 in-lbf <br /> fb: 1,372 psi <br /> Fb allowable: 1,547 psi-per NDS Section 4 and Design Values for Wood Construction <br /> Purlin usage: 89% OK <br /> End reactions: <br /> Snow load: 270 lbs If joist hanging,use LU26 joist hanger w/10d nails <br /> or JB26 top-flange joist hanger w/10d nails <br /> uplift: 154 lbs (3)nails each side of flat purlin block <br /> Girt Calculation <br /> Greatest Bay Spacing: 14 ft. <br /> O.C.Spacing: 24 in <br /> Girt Sx: 3.59 in3 <br /> Total wind pressure: 12.39 psf <br /> w: 2.07 pli <br /> Girt Span: 162 in <br /> M: 6,777 lbf-in <br /> fb: 1,888 psi <br /> Fb allowable: 2,476 psi-per NDS Section 4 and Design Values for Wood Construction <br /> Girt usage: 76% OK <br /> Page 11 of 13 <br />