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SolarMount Unirac Code-Compliant Installation-Manual :FUNIRAC <br />Step 6: Determine the Uplift Point Load, R (lbs), at <br />each connection based on rail span <br />You must also consider the Uplift Point Load, R (lbs), to <br />determine the required lag bolt attachment to the roof <br />(building) structure. <br />Table 11. Uplift Point Load Calculation <br />Total Design Load (uplift): P psf Step I <br />Module length perpendicular to rails: B x: ft <br />Rail Span: L x ft Step 4 <br />12 <br />Uplift Point Load: R lbs <br />lable 1 2 L ag pull-out (withdrmin') capacities (lbs) in gpial roof lumber (ASD) <br />Douglas Fin Larch <br />Douglas Fin South <br />Engelmann Spruce, Lodgepole Pine <br />(MSR 1650 f & higher) <br />Hem, Fir, Redwood (close grain) <br />Hem, Fir (North) <br />Southerh Pine <br />Spruce, Pine, Fir <br />Spruce, Pine, Fir <br />(E of 2 million psi and higher <br />grades of MSR and MEL) <br />Lag screw specifications <br />Spedoc {16" shaft* <br />gravity per inch thread:depth <br />0.50 266 <br />0.46 235 <br />0.46 235 <br />0.43 212 <br />0.46 235 <br />Thread <br />0.55 307 depth <br />0.42 205 <br />0.50 266 <br />Use Table,12 to selecta lag bolt <br />size and embedment depth to <br />satisfy your Upli ft Point Load <br />Force, R Cbs), requirements. <br />Divide the uplift pointload (from <br />Table 11) by the withdrawal <br />capacity in the 2nd column of <br />Table 12. This results in inches <br />of 5/16 lagbolt cnibcddcd thread <br />depth needed to counteract the <br />uplift force. If other than lag <br />bolt is tised (as with a concrete <br />or steel), consult fastener mft· <br />documentation. <br />It is the installer's responsibility <br />o verify that the substructure <br />and attachment metliod is <br />strong enough to support the <br />maximum point loads calculated <br />accuidilig Lo SLev 5 aild Slt:p 6. <br />Sources:Amerkan Wood Cdund/. NDS.2-90&,Tob/e / /.2A. / /.3.2A. <br />Notes· C /) Thread must be embedded in the side grain of o rafter or other stoctufat member integrol with the <br />bui/ding structure. <br />(2) Log boks must be located in the middle third Of the structural, member. <br />(3) These vohies are not va/,8 for wet service. <br />(4)Thistable does not includeshear copoaties. tf necessary,contact c locolengineer tospecifylagbolt size <br />wilh regard to shear forces. <br />73)77.ta# 4% boits with head and washer#ush to surface:(no:gtip). Do not over-torque. <br />-(6)-Wit/id,clwal-des,rn-vokja·br/82-screw-colmettions sha# be mu/tip#ed by app#cable adjustment Actor.s V <br />necessory. See Toble 103.1 in the,Americon Wood Council NDS RrWood Construction. <br />*Uke flat washers, with lag screws. <br />Page <br />13