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Home My WebLink AboutAPPROVED Structural - 124813_Diehm, KathleenAttn.: To Whom It May Concern re job: The following calculations are for the structural engineering design of the photovoltaic panels and are valid only for the structural info referenced in the stamped plan set. The verification of such info is the responsibility of others. All mounting equipment shall be designed and installed per manufacturer's approved installation specifications. Design Criteria: Current Renewables Engineering Inc. Professional Engineer info@currentrenewableseng.com 03-08-2022 Freedom Forever LLC 43445 Business Park Dr Suite 110, Temecula, CA 92590 Diehm, Kathleen 5102 Seagrape Dr, Fort Pierce, FL 34982, USA I certify that the roof structure has sufficient structural capacity for the applied PV loads. Code: 2020 FBC, ASCE 7-16, Live Load: 20 psf Ult Wind Speed: 160 mph Exposure Cat: C Ground Snow: 0 psf Min Snow Roof: 0 psf 1960 Chicago Ave Suite D15, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com 2 of 7 Roof Properties: Roof Type = Roof Pitch (deg) = Mean Root Height (ft) = Attachment Trib Width (ft) = Attachment Spacing (ft) = Framing Type = Framing Size = Framing OC Spacing (in.) = Section Thickness, b (in) = Section Depth, d (in) = Section Modulus, Sx (in3) = Moment of Inertia, lx (in4) = Upper Chord Length (ft) = Framing Span (ft) = Deflection Limit D+L (in) = Deflection Limit S or W (in) = Attachments Pattern = Framing Upgrade = Sister Size = Wood Species = Wood Fb (psi) = Wood Fv (psi) = Wood E (psi) = CD (wind) = Cd (snow) = CLS = CM = Ct = CL = Ci = CF = Cfu = Cr = F'b wind (psi) = F'b snow (psi) = F'v wind (psi) = F'v snow (psi) = M allowable wind (lb-ft) = M allowable snow (lb-ft) = V allowable wind (lbs) = V allowable snow (lbs) = E' (psi) = Moment of Inertia, lx (in ) = Unsupported Span (ft) = Shingle 18.0 13.0 3.3 4.0 Truss 2x4 24.0 1.5 3.5 3.062 5.359 6.0 3.2 2.133 Fully Staggered No NA DF 900.0 180.0 1600000.0 1.6 1.15 1.0 1.0 1.5 1.0 1.15 2484.0 1785.37 288.0 207.0 633.94 455.64 1008.0 724.5 Roof 1 1600000.0 16.0 Diehm, Kathleen 3 of 7 Load Calculation: Dead Load Calculations: Ultimate Wind Speed (mph) = Directionality Facto r, kd = Topographic Factor, kzt = Velocity Press Exp Factor, kz = Velocity Pressure, qz (psf) = External Pressure Up, GCp_1 = External Pressure Up, GCp_2 = External Pressure Up, GCp_3 = External Pressure Down, GCp = Design Pressure Up, p_1 (psf) = Design Pressure Up, p_2 (psf) = Design Pressure Up, p_3 (psf) = Design Pressure Down, p (psf) = Panels Dead Load (psf) = Roofing Weight (psf) = Decking Weight (psf) = Framing Weight (psf) = Misc. Additional Weight (psf) = Existing Dead Load (psf) = Total Dead Load (psf) = Wind Load Calculations: Ground Snow Load, pg (psf) = Min Flat Snow, pf_min (psf) = Sloped Snow, ps_min (psf) = Snow Importance Factor, Ic = Exposure Factor, Ce = Thermal Factor, Ct = Flat Roof Snow, pf (psf) = Slope Factor, Cs = Sloped Roof Snow, ps (psf) = Snow Load Calculations: 3.0 3.0 2.0 0.602 1.0 6.602 9.602 160.083 0.85 1.0 0.849 47.337 -2.0 -2.569 -3.058 0.465 -80.424 -103.317 -122.974 18.681 Roof 1 0.0 0.0 0.0 1.0 0.9 1.2 0.0 1.0 0.0 Diehm, Kathleen 4 of 7 Roof Framing Checks: LC1: D+S Force Checks: Applied Moment (lb-ft) = Applied Shear (lbs) = Allowable Moment (lb-ft) = Allowable Shear (lbs) = Moment DCR = Shear DCR = Hardware Checks: LC2: D+0.6W Applied Moment (lb-ft) = Applied Shear (lbs) = Allowable Moment (lb-ft) = Allowable Shear (lbs) = Moment DCR = Shear DCR = Ref. Withdrawal Value, W (lb/in) = (Cm = Ct = Ceg = 1.0) CD = Adjusted Withdrawal Value, W' (lb/in) = Lag Penetration, p (in.) = Allowable Withdrawal Force, W'p (lbs) = Applied Uplift Force (lbs) = Uplift DCR = Ref. Lateral Value, Z (lbs) = (Cm = Ct = CΔ = Ceg = 1.0) CD = Adjusted Lateral Value, Z' (lbs) = Applied Lateral Force (lbs) = Angle of Resultant Force, α (deg) = Adjusted Interaction Lateral Value, Z'α (lbs) = Lateral DCR = 75.242 69.35 455.643 724.5 0.165 0.096 Roof 1 Roof 1 326.408 300.846 633.938 1008.0 0.515 0.298 266.0 0.9 243.0 12.237 1.558 1063.415 0.012 266.0 1.6 425.6 2.5 1064.0 -959.329 0.902 Diehm, Kathleen 5 of 7 LC2: S LC3: W (Down) Deflection Checks (Service Level): LC1: D+L LC4: W (Up) Deflection (in.) = Deflection Limit (in.) = Deflection DCR = Deflection (in.) = Deflection Limit (in.) = Deflection DCR = Deflection (in.) = Deflection Limit (in.) = Deflection DCR = Deflection (in.) = Deflection Limit (in.) = Deflection DCR = LC3: D+0.75(S+0.6W) LC4: 0.6D+0.6W Applied Moment (lb-ft) = Applied Shear (lbs) = Allowable Moment (lb-ft) = Allowable Shear (lbs) = Moment DCR = Shear DCR = Applied Moment (lb-ft) = Applied Shear (lbs) = Allowable Moment (lb-ft) = Allowable Shear (lbs) = Moment DCR = Shear DCR = 0.132 3.2 0.041 0.0 2.133 0.0 0.026 2.133 0.012 0.112 2.133 0.053 231.873 213.714 633.938 1008.0 0.366 0.212 347.101 319.918 633.938 1008.0 0.548 0.317 Diehm, Kathleen 6 of 7 (Existing W + Additional W)/(Existing W) = Weight Increase: Existing Weight: Total Additional PV Weight (lbs) = Seismic Check: The increase in weight as a result of the solar system is less than 10% of the existing structure and therefore no further seismic analysis is required. Wall Weight (psf) = Tributary Wall Area (ft2) = Total Wall Weight (lbs) = Roof Weight (psf) = Roof Area (ft2) = Total Roof Weight (lbs) = Total Existing Weight (lbs) = 17.0 700.0 11900.0 6.602 1200.0 7921.875 19821.875 1608.75 1.081 Diehm, Kathleen 7 of 7 Limits of Scope of Work and Liability: Existing structure is assumed to have been designed and constructed following appropriate codes at time of erection, and assumed to have appropriate permits. The calculations produced are only for the roof framing supporting the proposed PV installation referenced in the stamped planset and were completed according to generally recognized structural analysis standards and procedures, professional engineering and design experience, opinions and judgements. Existing deficiencies which are unknown or were not observable during time of inspection are not included in this scope of work. All PV modules, racking, and mounting equipment shall be designed and installed per manufacturer's approved installation specifications. The Engineer of Record and the engineering consulting firm assume no responsibility for misuse or improper installation. This analysis is not stamped for water leakage. Framing was determined based on information in provided plans and/or photos, along with engineering judgement. Prior to commencement of work, the contractor shall verify the framing sizes, spacings, and spans noted in the stamped plans, calculations, and cert letter (where applicable) and notify the Engineer of Record of any discrepancies prior to starting construction. Contractor shall also verify that there is no damaged framing that was not addressed in stamped plans, calculations, and cert letter (where applicable) and notify the Engineer of Record of any concerns prior to starting construction. Diehm, Kathleen