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SOLGEN <br />P O W E R 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 Wad <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, Pa <br />Exposure Factor, C, <br />Thermal Factor, Ct <br />Importance Factor, I, <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 />Result: <br />Without Solar With Solar <br />5 <br />5 <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 />2.56 <br />psf <br />13.5 <br />16.06 <br />psf <br />10 <br />1 <br />1.1 <br />1 <br />7.7 <br />21 <br />No <br />I yes <br />1.00 <br />0.82 <br />7.7 <br />6.3 <br />osf <br />:qn. 7.3-1 orjunsdiction min. <br />legrees <br />osf <br />20 0 psf <br />33.5 <br />16.1 <br />psf <br />21.2 <br />22.4 <br />psf <br />33.5 <br />22.4 <br />psf <br />67% <br />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 />