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McPherson Engineering By:T.B. <br />Da 01/04/4 <br />Existing Loads: <br />Roof Design Loads: <br />Roofing = 4.0 p.s.f. <br />Sheathing =1.5 p.s.f. <br />Framing =1.5 p.s.f. <br />Misc =1.0 p.s.f. <br />DLr1 =8.0 p.s.f. <br />Ceiling =2.0 p.s.f. <br />DLr2 =10.0 p.s.f. <br />LLr = 20.0 p.s.f. <br />SL = 0.0 p.s.f. <br />Floor Design Loads: (if applicable) <br />Flooring =10.0 p.s.f. <br />Sheathing = 2.2 p.s.f. <br />Framing =2.0 p.s.f. <br />Interior Partitions =15.0 p.s.f. <br />Ceiling =5.0 p.s.f. <br />Misc. = 0.8 p.s.f. <br />DLf = 35.0 p.s.f. <br />Proposed Loads: <br />Panels =2.9 p.s.f. <br />DLr1_proposed =10.9 p.s.f. <br />DLr2_proposed =12.9 p.s.f. <br />LLr_proposed = 0.0 p.s.f. <br />Check Proposed Gravity Loads: <br />Total Existing Roof Load <br />Wex = (DLr1 + LLr) (Aroof) =95.2 kips <br />Total Proposed Roof Load <br />Wprop = (DLr1 + LLr) (Aroof - Aarray) + (DLr1_proposed + LLr_proposed) (Aarray) =86.7 kips <br />Proposed Load Demand <br />Gravity Loads <br />1/2" Plywood <br />2x Framing <br />Roofing Dead Load (applied to top of rafters/trusses only) <br />Drywall and framing <br />Total Existing Roof Dead Load <br />Roof Live Load (Per C.B.C, Table 1607.1) <br />Snow Load <br />Weight of floor finish <br />3/4" plywood <br />2x framing or manufactured floor truss <br />2x framed walls with drywall finish each side <br />Drywall ceiling finish below <br />Total Existing Floor Dead Load <br />weight of panels including rack system <br />Proposed Roof Dead Load (applied to top only) <br />Total Proposed Roof Dead Load <br />Roof Live Loads need not be applied to the area covered with by PV panel where the <br />clear space between the panels and the roof sureface is 24in or less, 1607.13.5.1 item 1 <br />Exception <br />Wprop - W ex =-8.93% TOTAL DECREASE IN GRAVITY LOADS, PANELS OK!Wex <br />01 04/04 12: PM <br />4 of 7 <br />©McPherson Engineering <br />3000 S Sycamore St Unit# <br />A- 201822724/29/2024