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Home My WebLink AboutEngineer CalcFreedom Forever LLC 43445 Business Park Dr Suite 110 Temecula, CA 92590 Attn.: To Whom It May Concern re job:TATIANA HAMEL 4206 SUNRISE BLVD, FORT PIERCE, FL 34982 Design Criteria: Code:2020 FL Building Code 7th Edition ASCE 7-16 Live Load:20 psf Ult Wind Speed:159 mph Exposure Cat:C Ground Snow:0 psf Min Roof Snow:NA Current Renewables Engineering Inc. Professional Engineer info@currentrenewableseng.com 1/27/2021 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. After review, I certify that the roof structure has sufficient structural capacity for the applied PV loads. All mounting equipment shall be designed and installed per manufacturer's approved installation specifications. Date :1/27/2021 Job Code: TATIANA HAMEL 2 of 6 Roof Properties: Roof Type = Roof Pitch (deg) = Mean Roof 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 (in.^3) = Moment of Inertia, Ix (in.^4) = 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) = 725 1600000 524 1008 207 729 2053 288 1.15 2857 1.5 1.00 1.15 1.0 1.6 1.15 180 1600000 DF #2 900 Adequate NA 1.07 Fully Staggered 8 1.6 3.1 5.4 1.5 3.5 2x4 24 6 Rafter 13 2.75 Shingle 18 Roof 1 Date :1/27/2021 Job Code: TATIANA HAMEL 3 of 6 Load Calculation: 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) = Ultimate Wind Speed (mph) = Directionality Factor, kd = Topographic Factor, kzt = Velocity Press Exp Factor, kz = Ground Elevation Factor, ke = Velocity Pressure, qz (psf) = Array Edge Factor, γE = Solar Equalization Factor, γa = 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) = Hardware Checks: Ref. Widthrawal Value, W (lb/in) = (CM = Ct = Ceg = 1.0) CD = Adjusted Widthrawal Value, W' (lb/in) = Lag Penetration, p (in.) = Allowable Widthrawal Force, W'p (lbs) =1064 426 2.5 266 1.6 Lag Screw Checks: Roof 1 22.6 -97.8 -116.7 0.6 -75.3 -2.6 -3.1 1.25 0.64 -2 0.85 1.00 46.7 159 0.85 1.0 Roof 1 Wind Load Calculations: 6.6 9.6 0.6 1.0 3.0 2.0 Dead Load Calculations: 3.0 Roof 1 Date :1/27/2021 Job Code: TATIANA HAMEL 4 of 6 Applied Uplift Force (lbs) = Uplift DCR = Ref. Lateral Value, Z (lbs) = (CM = Ct = CΔ = Ceg = 1.0) CD = Adjusted Lateral Value, Z' (lbs) = Applied Laeral Force (lbs) = Angle of Resultant Force, α (deg) = Adjusted Interaction Lateral Value, Z'α (lbs) = Lateral DCR = Roof Framing Checks: LC1: D+S 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 =0.86 729 1008 630 315 0.43 0.16 729 1008 316 158 0.51 0.18 729 1008 370 185 0.29 0.11 524 725 77 Force Checks: Roof 1 154 1063 0.01 15 89 0.9 243 1.07 270 -1134 Date :1/27/2021 Job Code: TATIANA HAMEL 5 of 6 Shear DCR = LC1: D+L Deflection (in.) = Deflection Limit (in.) = Deflection DCR = LC2: S Deflection (in.) = Deflection Limit (in.) = Deflection DCR = LC3: W (Down) Deflection (in.) = Deflection Limit (in.) = Deflection DCR = LC4: W (Up) Deflection (in.) = Deflection Limit (in.) = Deflection DCR = Seismic Check: 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) = PV Panel Weight (lbs) = Number of Panels = Total Additional PV Weight (lbs) = (Existing W + Additional W)/(Existing W) =106% The increase in weight as a result of the solar system is less than 10% of the existing structure and Additional PV Weight: 54 45 2450 Weight Increase: 1200 20400 7 3500 23105 43505 0.55 Existing Weight: 17 -0.68 1.23 1.23 0.17 0.00 0.20 0.00 1.23 1.84 0.17 Deflection Checks (Service Level): Roof 1 0.31 0.31 Date :1/27/2021 Job Code: TATIANA HAMEL 6 of 6 therefore no further seismic analysis is required. 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.