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McPherson Engineering By:F.A. <br />Date:1/27/23 <br />Existing Loads: <br />Roof Design Loads: <br />Roofing = 4.0 p.s.f.Composition roofing <br />Sheathing =1.5 p.s.f.5/8" Plywood <br />Framing =1.5 p.s.f.Roof Trusses/Purlins <br />Misc =3.0 p.s.f.(includes mechanical) <br />DLr1 =10.0 p.s.f.Roofing Dead Load <br />Ceiling =3.0 p.s.f. <br />DLr2 =13.0 p.s.f.Total Existing Roof Dead Load <br />LLr = 20.0 p.s.f.Roof Live Load (Per C.B.C 2016, Table 1607.1) <br />Wall Design Loads: <br />DLwall =15.0 p.s.f.dead load of wood framed exterior wall <br />hwall =10.0 ft.height of walls <br />Lwall =379.5 ft.total length of walls <br />Wwall =56.9 kips <br />Proposed Loads: <br />Panels =4.1 p.s.f.weight of panels, rack system, and ballast weight <br />DLr1_proposed =17.1 p.s.f.Proposed Roof Dead Load <br />LLr_proposed = 0.0 p.s.f. <br />Check Proposed Gravity Loads: <br />Total Existing Roof Load <br />Wex = (DLr1 + LLr) (Aroof) =297.0 kips <br />Total Proposed Roof Load <br />Wprop = (DLr1 + LLr) (Aroof - Aarray) + (DLr1_proposed + LLr_proposed) (Aarray) =256.1 kips <br />Proposed Load Demand <br />Gravity Loads <br />Wprop - Wex =-13.79%Wex <br />TOTAL DECREASE IN GRAVITY LOADS, PANELS OK! <br />Roof Live Load (panels cannot support live loads, including the weight <br />of stacked materials or workers) <br />half of the total weight of walls (tributary to seismic <br />loading on roof diaphragm) <br />01/30/2023 © McPherson Engineering <br />4 of 6 <br />1323 E St Gertrude Unit B - <br />101115120 & 2017966710/12/2023