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SolarMount Unirac Code-Compliant Installation Manual :1'UNIRAC <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 Obs), to <br />determine the required lag bolt attachment to the roof <br />(building) structure. <br />Table 11. Uplift Point Load Calculatioh <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 />j1 <br />Uplift Point Load: R lbs <br />Table I Z Lag pull-out (withdrawal) capacities (lbs) <br />Specific <br />gruWty <br />Douglas Fir, Larch <br />Douglas Fin South <br />Engelmann Spruce, Lodgepole Pine <br />(MSR 1650 f & higher) <br />Hem, Fir, Rerlwonrl (rln,e gr.in) <br />Hem, Fir (North) <br />Southern Pine <br />Spruce, Pine, Fir <br />Spruce, Pine, Fir <br />(E of 2 million psi and higher <br />grades of MSR and MEL) <br />in typical fooflumber (ASD) <br />Lagscrew spedticatiois <br />3/„ " shaft* <br />per inch thread depth <br />0.50 266 <br />0.46 235 <br />0.46 235 <br />0.43 <br />0.46 235 <br />Thread <br />0.55 307 depth <br />0,42 205 <br />0.50 266 <br />Use Table 12 to select a lag bolt <br />size and embedment depth to <br />satisfy your Uplift Point Load <br />Force, R (lbs), 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 lagbol'L ei tibedded Litiead <br />depth needed to counteract the <br />uplift force. If other'than lag <br />bolt is used (as with a concrete <br />or steel), consult fastenermfr <br />J uc ul 1.10 1 Lall Ul l. <br />It is the installer's responsibility <br />to verify that the substructure <br />and attachment method is <br />strong enough to support the <br />maximum poiht loads; calculated <br />according to Step 5 and Step 6. <br />Oifir,·p,·Anl,hririn Windrn„MA, Ain€ 7nnf T.bie //28 H)2A <br />Notes: ( l) Thread Must be embedded in the side grain of a rafter or other structural member integral with the <br />building structure. <br />(2) Log bolts must be located in the middle third of the structural member, <br />(3) These values are not vafid for wet service. <br />(4)'This tobje does not inchide shear capacities. If necessary, conted.a local engineer to spedfly lag bolt size <br />with reeard to sheer forces. <br />(5) #}sta# kig bolts with head and washer flush to surface (no gap). Do not over-torquj <br />76)-WWW*2 design dues for log screw connections sha# be inultiplied by-®Nicable adjustment Actors if <br />necessary. See Tabie / 0.3. / m the American Wood Council NDS Ar Wood Construction. <br />*Use fat washers with lag screws <br />p.ge <br />13