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McPherson Engineering By: J.R.  <br />Date: 5/28/24 <br />Existing Loads: <br />Roof Design Loads: <br />Roofing = 4.0 p.s.f.Composition roofing <br />Sheathing = 1.5 p.s.f.1/2" Plywood <br />Framing = 1.5 p.s.f.2x Rafter/Truss framing <br />Misc = 3.0 p.s.f. <br />DLr1 =10.0 p.s.f.Roofing Dead Load (applied to top of rafters/trusses only) <br />Ceiling = 2.0 p.s.f.Drywall and 2x framing <br />DLr2 =12.0 p.s.f.Total Existing Roof Dead Load <br />LLr = 20.0 p.s.f.Roof Live Load (Table 1607.1) <br />Floor Design Loads: (if applicable) <br />Flooring = 10.0 p.s.f.Weight of floor finish <br />Sheathing = 2.2 p.s.f.3/4" plywood <br />Framing = 2.0 p.s.f.2x framing or manufactured floor truss <br />Interior Partitions = 15.0 p.s.f.2x framed walls with drywall finish each side <br />Ceiling = 5.0 p.s.f.Drywall ceiling finish below <br />Misc. = 0.8 p.s.f. <br />DLf = 35.0 p.s.f.Total Existing Floor Dead Load <br />Proposed Loads: <br />Panels = 2.7 p.s.f.weight of panels including rack system <br />DLr1_proposed =12.7 p.s.f.Proposed Roof Dead Load (applied to top only) <br />DLr2_proposed =14.7 p.s.f.Total Proposed Roof Dead Load <br />LLr_proposed = 0.0 p.s.f. <br />Check Proposed Gravity Loads: <br />Total Existing Roof Load <br />Wex = (D r1 + LLr) (Aroof) =48.0 kips <br />Total Proposed Roof Load <br />Wprop = (D r1 + LLr) (Aroof ‐ Aarray) + (D r1_proposed + LLr_proposed) (Aarray) =38.2 kips <br />Proposed Load Demand <br />Wprop ‐ Wex  =‐20.38%Wex <br />TOTAL DECREASE IN GRAVITY LOADS, PANELS OK! <br />Gravity Loads ‐ Main Residence <br />Roof Live Load (panels cannot support live loads, including the weight  <br />of stacked materials or workers) <br />5/28/2024  10:57 AM <br />4 of 9 <br />©McPherson Engineering <br />403 N Susan St #G <br />& H10/21/2024