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SOLGr-N <br />P 0 w E P Note: All calculations per ASCE 7 <br />Load Comparison <br />This calculation justifies the additional solar load by comparing existing to proposed gravity loads <br />in the location of the solar panels. <br />Dead Load <br />Asphalt Shingles <br />1/2" Plywood <br />Framing <br />Insulation <br />1/2" Gypsum Ceiling <br />M,E, & Misc <br />Solar Panel <br />Total Dead Load <br />Snow Load <br />Ground Snow Load, Pg <br />Exposure Factor, Ce <br />Thermal Factor, Ct <br />Importance Factor, IS <br />Flat Roof Snow Load <br />Slope <br />Unobstructed Slippery Surface? <br />Slope Factor, C, <br />Sloped Roof Snow Load <br />Live Load <br />Roof Live Load <br />Load Combination <br />D + Lr <br />D + S <br />Max. Load <br />of original <br />Withniif Cninr \A/ith Cninr <br />3 <br />3 <br />psf <br />1 <br />1 <br />psf <br />3 <br />3 <br />psf <br />1 <br />1 <br />psf <br />2 <br />2 <br />psf <br />1.5 <br />1.5 <br />psf <br />0 <br />2.77 <br />psf <br />11.5 1 14.27 psf <br />15 <br />1 <br />1.1 <br />1 <br />11.55 <br />27 <br />No <br />No <br />1.00 <br />1.00 <br />11.6 <br />11.6 <br />psf <br />Eqn. 7.3-1 or jurisdiction min. <br />degrees <br />psf <br />20 1 0 psf <br />31.5 <br />14.3 <br />psf <br />23.1 <br />25.8 <br />psf <br />31.5 <br />25.8 <br />psf <br />82% <br />Result: Because the total forces are decreased, per the relevant code <br />provisions stated in the body of the letter, the existing roof <br />structure is permitted to remain unaltered. <br />