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Project: Santa Ana -- Job #: 2023-10986 <br />Date: 9/12/2023 Engineer: BV <br />Area covered by the array:9753.2 sq. ft. <br />Area of PV panels:7479.5 sq. ft. <br />% of array area that is covered by panels:76.7% <br />Specified Roof Live Load:Lo =20.0 psf <br />Live Load Replacement Allowed?Yes <br />Roof live load reduction (CBC 1607.12.2.1)R1 =0.60 <br />R2 =1.00 <br />Lr =12.0 psf <br />Uniform Roof Snow Load:0.0 psf <br />Existing Roof Dead Load:12.00 psf <br />Roof Live Load Duration Factor (Wood):1.25 (NDS Table 2.3.2) <br />Dead Load Duration Factor (Wood):0.9 (NDS Table 2.3.2) <br />Existing Roof Load (Total including Duration Factors)22.9 psf <br />Live Load Replacement: 76.7% * (12 / 1.25) =7.4 psf <br />Allowable 5% increase per IBC 3403.3 1.15 psf <br />Allowable Load Increase or Replacement:8.51 psf <br />Max Allowable Added Dead Load:7.66 psf <br />Max Allowable Added Dead Load:7.66 psf <br />Ballasted PV Array Dead Load:4.85 psf <br />4.85 psf < 7.66 psf, Therefore OK <br />Load replacement check <br />Per CEBC 502.4 and by inspection, portions of the roof that are impacted by installation of the array will be <br />subject to a net reduction in design loading. Therefore, the existing structure may remain unaltered. <br />Santa Ana Gravity Check (CEBC 502.4): <br />Due to operational constraints of the PV panels, live loads are not permitted to be placed on the PV panels. <br />Therefore, in the area of the array, the change in loading is as follows: <br />Page 51 of 52 <br />3600 W Segerstrom Ave - <br />101117310 & 201813801/11/2024