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Home My WebLink AboutSTRUCTURAL CALCS - 22-00442 - 669 S 12th W - Solar PanelsAttn.: 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 06-21-2022 Page 1 of 8 06-21-2022 Freedom Forever LLC 43445 Business Park Dr Suite 110, Temecula, CA 92590 Nathan Mcfarlane 669 S 12th W, Rexburg, ID 83440, USA I certify that the roof structure has sufficient structural capacity for the applied PV loads. Code: IBC 2018, ASCE 7-16, Live Load: 20 psf Ult Wind Speed: 115 mph Exposure Cat: C Ground Snow: 50 psf Min Snow Roof: 0 psf 1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com 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) = 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) = Upper Chord Length (ft) = Page 2 of 8 Shingle 23.0 13.0 3.25 4.0 Truss 2x4 24.0 1.5 3.5 3.062 5.359 6.0 2.8 1.867 Fully Staggered No NA DF 900.0 180.0 1600000.0 1.6 1.15 1.15 1.0 1.5 1.0 1.15 2856.6 2053.18 288.0 207.0 729.03 523.99 1008.0 724.5 Roof 1 1600000.0 14.0 Nathan Mcfarlane 1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com Load Calculation: Dead Load Calculations: 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: 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) = Snow 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) = Page 3 of 8 3.0 3.0 2.0 0.602 1.0 6.602 9.602 115.0 0.85 1.0 0.849 24.429 -1.5 -2.167 -2.453 0.465 -31.128 -44.975 -50.905 16.0 Roof 1 50.0 0.0 0.0 1.0 0.9 1.2 37.8 1.0 37.8 Nathan Mcfarlane 1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com Lag Screw Checks: 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 = Page 4 of 8 Roof 1 266.0 1.15 310.5 207.244 0.916 559.868 0.37 266.0 1.6 425.6 2.5 1064.0 -269.817 0.254 Nathan Mcfarlane 1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com 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 = LC2: D+0.6W Applied Moment (lb-ft) = Applied Shear (lbs) = Allowable Moment (lb-ft) = Allowable Shear (lbs) = Moment DCR = Shear DCR = LC3: D+0.75(S+0.6W) Applied Moment (lb-ft) = Applied Shear (lbs) = Allowable Moment (lb-ft) = Allowable Shear (lbs) = Moment DCR = Shear DCR = LC4: 0.6D+0.6W Applied Moment (lb-ft) = Applied Shear (lbs) = Allowable Moment (lb-ft) = Allowable Shear (lbs) = Moment DCR = Shear DCR = Page 5 of 8 Nathan Mcfarlane 379.0 344.0 524.0 724.0 0.724 0.474 Roof 1 154.0 139.0 729.0 1008.0 0.211 0.138 361.0 327.0 729.0 1008.0 0.495 0.325 1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com 123.0 111.0 729.0 1008.0 0.169 0.11 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 = Page 6 of 8 0.124 2.8 0.044 0.123 1.867 0.066 0.022 1.867 0.012 0.043 1.867 0.023 Nathan Mcfarlane 1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com (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) = Page 7 of 8 17.0 1000.0 17000.0 6.602 2400.0 15843.75 32843.75 1029.6 1.031 Nathan Mcfarlane 1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com 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. Page 8 of 8 Nathan Mcfarlane 1760 Chicago Ave Suite J13, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com