Installation Guide

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 NDS Table 11.5.1C for required edge distances.
Lag pull-out (withdrawal) capacities (lbs) in typical lumber:
Lag Bolt Specications
Specic Gravity 5/16" shaft per 3" thread depth 5/16" shaft per 1" thread depth
Douglas Fir, Larch .50 798 266
Douglas Fir, South .46 705 235
Engelmann Spruce, Lodgepole Pine (MSR 1650 f & higher) .46 705 235
Hem, Fir .43 636 212
Hem, Fir (North) .46 705 235
Southern Pine .55 921 307
Spruce, Pine, Fir .42 615 205
Spruce, Pine, Fir (E of 2 million psi and higher grades of MSR and MEL) .50 798 266
Classic Composition Mount QMSC
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5$&.,1*&20321(176
127,1&/8'('
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4%/2&.&/$66,&$&$67$/0,// 
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187+(;81&%66 
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:$6+(563/,7/2&.,'66 
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02817
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Sep-2013, Rev 6BI 7.2.3-7