QMCC A 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 IBC for required edge distances.
IMPORTANT: To maintain waterproong it is important that the aluminum ashing (item 1) is properly placed under one full course above the mounting block with at least some of the
ashing extending up under the course above that as well. See instructions on back.
Lag pull-out (withdrawal) capacities (lbs) in typical lumber:
Lag Bolt Specications
Specic Gravity 1/4" shaft per 1 3/4" thread depth 1/4" shaft per 1" thread depth
Douglas Fir, Larch .50 393 225
Douglas Fir, South .46 353 202
Engelmann Spruce, Lodgepole Pine (MSR 1650 f & higher) .46 353 202
Hem, Fir .43 313 179
Hem, Fir (North) .46 353 202
Southern Pine .55 455 260
Spruce, Pine, Fir .42 302 173
Spruce, Pine, Fir (E of 2 million psi and higher grades of MSR and MEL) .50 393 225
Classic Conduit Composition Mount QMCC






7+,6('*(72:$5'6522)5,'*(




&21'8,7&/$03
127,1&/8'('


$9$,/$%/(,10,//&/($5$12',=('
$1'%521=($12',=('),1,6+(6
,7(012 '(6&5,37,21 47<
 )/$6+,1*;;0,// 

4%/2&.&21'8,770,// 

:$6+(56($/,1*,';2'(3'0
%21'('66


/$*6&5(:+(;+($'[66 

'21276&$/('5$:,1*
6+((72)
5$'
6&$/( :(,*+7
5(9
$
6,=(
7,7/(
'$7(
'5$:1%<
',0(16,216$5(,1,1&+(6
72/(5$1&(6
)5$&7,21$/

7:23/$&('(&,0$/

7+5((3/$&('(&,0$/

35235,(7$5<$1'&21),'(17,$/
7+(,1)250$7,21&217$,1(',17+,6'5$:,1*,67+(62/(3523(57<2)48,&.0281739$1<5(352'8&7,21,13$5725$6
$:+2/(:,7+2877+(:5,77(13(50,66,212)48,&.0281739,6352+,%,7('





81/(6627+(5:,6(63(&,),('

40&&&/$66,&&21'8,7
&20326,7,2102817

Oct-2013, Rev 4BI 7.2.3-8