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Check Existing 2X4 Roof Trusses @ 24" O.C.: <br />Snow Load = 0 psf <br />Dead Load = 14 psf <br />Live Load = 16 psf <br />WDL + LL = 30 psf x 2 ft. = 60 plf <br />WDL = 14 psf x 2 ft. = 28 plf <br />w = 30 psf x 2 ft. = 60 plf <br />Total load on trusses = ( 60 plf x 7.9 ft ) + ( 28 plf x 6.4 ft ) + ( 4' x 3.2' x 3 psf x 2 ) <br />= 730 lbs < 858 lbs OK <br />OK. Per 2022 California Existing Building Code Section 503.3 Alterations <br />Check attachment of Support to Existing Structure for Wind Uplift <br />CHECK SOLAR STRUCTURE ATTACHMENTS PER ASCE 7-16 WIND LOADS ON BUILDING <br />APPURTENANCES AND OTHER STRUCTURES Section 29.4.4 THEREFORE CHECK <br />ATTACHMENT FOR TYPICAL CRITICAL LOAD WHICH IS THE EDGE ZONE - ZONE 2. <br />NOTE: PER DEFINITION ON SHEETS 246 & 247 OF ASCE 7-16 EFFECTIVE WIND AREA: <br />FOR ROOFTOP SOLAR ARRAYS, THE EFFECTIVE WIND AREA IN FIG. 29.4-7 IS <br />EQUAL TO THE TRIBUTARY AREA FOR THE STRUCTURAL ELEMENT BEING <br />CONSIDERED, EXCEPT THAT THE WIDTH OF THE EFFECTIVE WIND AREA NEED NOT <br />BE LESS THAN ONE-THIRD ITS LENGTH. <br />EFFECTIVE AREA = 15 SQ FT <br />Sht # 3 of 7 <br />2023-4435 Grid Alt LA Habitat for Humanity OC August 8, 2023 <br /> Loyd W. Martin Professional Engineer, Inc. <br />9924 Universal Boulevard #224-406 Orlando, FL 32819 Tel:1.310.464.1804 <br /> Email: loydwmartin@gmail.com www.loydwmartin.com <br />% CHANGE =730 lbs - 858 lbs x 100 = -14.9% < 5% OK858 lbs <br />Z //Z '/ <br />55 <br /> <br /> <br />3 3 <br />826 N Lacy St <br />08/30/23