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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 /> Without Solar With Solar <br /> Dead Load <br /> Asphalt Shingles 3 3 psf <br /> 1/2" Plywood 1 1 psf <br /> Framing 3 3 psf <br /> Insulation 1 1 psf <br /> 1/2" Gypsum Ceiling 2 2 psf <br /> M,E, & Misc 1.5 1.5 psf <br /> Solar Panel 0 2.62 psf <br /> Total Dead Load 11.5 14.12 psf <br /> Snow Load <br /> Ground Snow Load, Pg 15 psf <br /> Exposure Factor, Ce 1 <br /> Thermal Factor, Ct 1.1 <br /> Importance Factor, IS 1 <br /> Flat Roof Snow Load 11.55 Eqn. 7.3-1 orjurisdiction min. <br /> Slope 18 degrees <br /> Unobstructed Slippery Surface? No No <br /> Slope Factor, CS 1.00 1.00 <br /> Sloped Roof Snow Load 11.6 11.6 psf <br /> Live Load <br /> Roof Live Load 1 20 1 0 Ipsf <br /> Load Combination <br /> D + Lr 31.5 14.1 psf <br /> D + S 23.1 25.7 psf <br /> Max. Load 1 31.5 1 25.7 Ipsf <br /> of original 81% <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 />