The URL can be used to link to this page

Home My WebLink AboutAPPROVED Structural Calculation - Zapata, Alejandro(1). RE:CERTIFICATION LETTER Project Address: Zapata Residence 5413 Hickory Drive Fort Pierce, FL 34982 Design Criteria: - Applicable Codes = 2020 7th Edition FBC, 2020 7th Edition FRC, ASCE 7-16, and 2018 NDS - Risk Category = II - Wind Speed = 152 mph, Exposure Category C, Partially/Fully Enclosed Method - Ground Snow Load = 0 psf - Roof 1&2: 2x4 @ 24" OC, Roof DL = 7 psf, Roof LL/SL = 20 psf (Non-PV), Roof LL/SL = 0 psf (PV) To Whom It May Concern, Sincerely, August 25, 2021 Yuri Yurianto, S.E., P.E. A jobsite survey of the existing framing system of the address indicated above was performed by Freedom Forever. All structural evaluation is based on the site inspection observations and the design criteria listed above. Existing roof structural framing has been reviewed for additional loading due to installation of PV Solar System on the roof. The structural review applies to the sections of roof that is directly supporting the solar PV system. Based on this evaluation, I certify that the alteration to the existing structure by installation of the PV system meets the requirements of the applicable existing building and/or new building provisions adopted/referenced above. Additionally, the PV module assembly including attachment hardware has been reviewed to be in accordance with the manufacturer’s specifications and to meet and/or exceed the requirements set forth by the referenced codes. Barun Corp | Design and Engineering | 610.202.4506 | chrisk@barun-corp.com | www.barun-corp.com By Yuri at 6:28:42 AM, 9/24/2021 Roof 1&2 PV module weight 2.5 psf Hardware assembly weight 0.5 psf PV-DL 3 psf Existing Roofing Material Standing Seam Roof 1 layers 2.5 psf Underlayment 0.5 psf Plywood Sheathing 1.5 psf Rafter Size and Spacing 2 x 4 @ 24 in. O.C.0.73 psf Vaulted ceiling No 0 psf Miscellaneous 1.5 psf Total Roof Dead Load R-DL 7 psf Expression Roof Live Load Lo 20.0 psf Member Tributary Area At < 200 sf Roof 1&2 Roof Pitch 4/12 or 16° Trubutary Area Reduction R1 1 Slope Roof Reduction R2 1 Reduced Roof Live Load Lr = Lo (R1) (R2)20.0 psf Ground Snow Load pg 0 Effective Roof Slope 16° Snow Importance Factor Is 1.0 Snow Exposure Factor Ce 1.0 Snow Thermal Factor Ct 1.1 Minimum Flat Roof Snow Load pf-min 0 Flat Roof Snow Load pf 0 Roof Slope Factor Cs-roof 1.00 ps-roof 0.00 Roof Slope Factor Cs-pv 0.90 ps-pv 0.00 Snow Load Sloped Roof Snow Load on PV Slope Roof Snow Load on Roof Value Material Panel AreaRoof Dead Load (R-DL) Reduced Roof Live Load (Lr) PV System Dead Load (PV-DL) (All other surfaces) (Unobstructed slippery surfaces) Value Barun Corp | Design and Engineering | 610.202.4506 | chrisk@barun-corp.com | www.barun-corp.com Roof Dead Load Standing Seam Metal Roof 2.50 psf Insulation 0.50 psf 1/2" plywood 1.50 psf Framing 0.73 psf Miscellaneous 1.50 psf Sum 6.73 psf PV DL 3 psf Roof Live Load 20 psf Roof Live Load (PV) 0 psf Snow Load 0 psf Existing With PV DL (psf) 6.73 9.73 Lr (psf) 20.00 0.00 S (psf) 0.00 0.00 Existing With PV (D + Lr) / Cd = 21.38 10.81 (D + S) / Cd = 5.85 8.46 (Cd = Load Duration Factor = 0.9 for DL, 1.15 for SL, and 1.25 for Lr) Maximum Gravity Load 21.38 10.81 Load Increase (%)-49.44%OK IBC Provision 2018 *The requirements of Section 806.2 of the 2018 IEBC are met and the structure is permitted to remain unaltered. Barun Corp I Design and Engineering I 610.202.4506 I chrisk@barun-corp.com I www.barun-corp.com Ultimate Wind Speed (mph) 152 Roof Pitch (degrees) 16 Risk Category II Roof Type Gable Exposure Category C Kd 0.85 Mean Roof Height (ft) 15 Kzt 1 PV DL (psf)3 Kz 0.85 qh = 0.00256*Kz*Kzt*Kd*Ke*V^2 = 42.66 a (ft) = 4.00 array edge factor γE= 1.50 Solar panel pressure eq. factor γa= 0.65 Hardware Type Allowable Load (lb) 300.00 lbs for S5! Clamp Maximum X - Spacing (ft) (Zone 1,2e) 2.00 Maximum Y - Spacing (ft) (Zone 1,2e) 1.70 Maximum X - Spacing (ft) (Zone 2n-3r) 2.00 Maximum Y - Spacing (ft) (Zone 2n-3r) 1.70 Roof Zone GCp (-) Uplift Uplift Pressure (psf) Pullout Force (lbs) 1,2e -2.00 -48.18 163.82 2n,2r,3e -3.00 -73.14 248.68 3r -3.60 -88.12 299.59 * Wind Calculation is based on ASCE7-16, 29.4 - C&C, LC#7: 0.6D + 0.6W Used 3.40 Effective Wind Area (ft2) 3.40 Site Information Design Calculations Design Wind Pressure Calculation for Solar Panel on Roof Effective Wind Area (ft2)