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Project: <br />Location: <br />LATERAL (SEISMIC) LOAD CHECKS DUE TO ADDITION OF (N) PHOTOVOLTAIC SYSTEM <br />PER 2021 IEBC | 2022 CEBC SECTION 503.4 <br />Existing Roof Seismic Weight: <br />Existing Seismic Weight @ Roof Level, WE = <br />New PV System Seismic Weight: <br />Seismic Weight of New PV System, WPV = <br />9.6%< 10%, Therefore O.K. <br />David Smith <br />Santa Ana, CA <br />10,324 LBS <br />WEIGHT <br />(LBS) <br />968 <br />2,324 <br />2,344 <br />4,688 <br />* Note: Wall Height, H= 8'-0" <br />Therefore, the exception provided under IEBC / CEBC Section 503.4 applies since the (N) load due <br />to the addition of PV System does not exceed the 10% threshold of the existing seismic weight. <br />% Increase in Lateral (Seismic) Weight @ Roof Level <br />Due to PV System Addition, %-Increase = WPV / WE = <br />987 LBS <br />ELEMENT <br />UNIT WEIGHT <br />(PSF) <br />AREA <br />(SQ.FT) <br />WEIGHT <br />(LBS) <br />PV System 2.63 375.3 987 <br />AREA <br />(SQ.FT) <br />UNIT WEIGHT <br />(PSF) <br />1945 <br />5868 <br />Interior Walls* <br />Exterior Walls* <br />5864Ceiling <br />194 <br />Roof DL <br />(7/8" Stucco) <br />12 <br />30011 Ivy Glenn Dr, Ste 219, Laguna Niguel, CA 92677 <br />info@lagunaengineers.com <br />ELEMENT <br />Page 5 <br />HISTORIC-825 N <br />Lacy St2/18/2025