Installation Guide

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$9$,/$%/(,1$1'+(,*+76
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 :$6+(563/,7/2&.,'66 
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Sources: American Wood Council, NDS 2005, Table 11.2 A, 11.3.2 A
Notes:
1) Thread must be embedded in a rafter or other structural roof member.
2) See IBC for required edge distances.
Lag pull-out (withdrawal) capacities (lbs) in typical lumber:
Lag Bolt Specications
Specic Gravity 2/ea 5/16" shaft per 2.5" thread depth 5/16" shaft per 1" thread depth
Douglas Fir, Larch .50 1330 266
Douglas Fir, South .46 1175 235
Engelmann Spruce, Lodgepole Pine (MSR 1650 f & higher) .46 1175 235
Hem, Fir .43 1060 212
Hem, Fir (North) .46 1175 235
Southern Pine .55 1535 307
Spruce, Pine, Fir .42 1025 205
Spruce, Pine, Fir (E of 2 million psi and higher grades of MSR and MEL) .50 1330 266
QBase Low Slope Mount QMLSH
Jun-2015, Rev 5
BI 7.2.3-5