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'' BYON ENG]NEERING Date <br />Tel: 626-991-7354 Project No BESOLTONYllag <br />iv Page 1 <br />_ROOF-TOP SOLAR MO.DULE <br />(2013 california building code) <br />MODEL : MEMC-M250AMC (3.25 ft x 5.44 ft, weight = 2.5 nsf) <br />(weight= 19 kg / 0.45 kg/lb x 3.25' x 5.44' = 2.39 psf Use 2.5 psf) <br />< CHECK WIND UPLIFT: Basic Wind Speed (Vult.) = 110 mph > <br />Max. wind uplift (vertical pressure) for Exposure 'B', p = 0.6 x 23.1 psf= 13.9 psf <br />(allowable stress design) <br />(ASCE 7-10, Fig. 28.6-1 : Method 2)Simplified Design Wind Pressure <br />For Exposure 'C' (max. height = 20 ft), p = 1,29 x 13.9 - 17.9 psf <br />P(net) = 17.9 psf- 2.5 psf = 15.4 ps-f <br />Total uplift = 15.4 psfx 39"/12 x 65.3"/12 = 272 # per module <br />There are min. (2) - connection points per module, and (1) - lag is used at each connection point <br />T (allow) = 266 #/inx min. 1.5 inxmin. 21agsper module = 798# > 272# O.K. <br />(NDS Table 11.2A, Pg. 68 : G= 0.5 for Douglas Fir-Larch) <br />USE min. (2) - 5/16" dia. x min. 1.5" embed. wood lag screws (3 M" long) per module, <br />Which means (1) - lag per each connection point