Installation Guide
Sources: AME Report 111114C, 12/13/2011
Notes: Please note that ultimate load is NOT the same as allowable load. Ultimate load is the load at the point of failure. Since point of failure is usually heavily dependent on the roof
itself, allowable load should be calculated by the responsible engineer using the appropriate factor of safety for that job.
Important: To maintain waterproong on shake roofs, it is important to make sure the top edge of the aluminum ashing (item 4) reaches under the felt paper of the course above the
point of installation. If the ashing edge doesn't reach, install an additional piece of felt paper under the course of felt above and over the ashing. To maintain waterproong on slate
roofs it is important the top edge of the ashing (item 4) reaches under the 3rd course of slate above the point of installation. See steps 10 and 11 of instructions.
Ultimate Load Capacity
Test Setup
Average values based on failure tests results in Douglas Fir
Ultimate Load Capacity [lbf] Rafter moisture content (%) Rafter specic gravity Failure Mode
Pullout 3031 20.9 0.436
Lag Bolt Pull-Out
Shear Parallel to Rafter 1972 17.4 0.417
Lag Bolt Pull-Out
Shear Perpendicular to Rafter 1466 17.2 0.494
Plywood buckled/ Bent
Machine Bolt
QBase Shake & Slate Mount QMNS
PLEASE NOTE: Cedar shakes treated with ACQ or CCA wood preservatives or re retardant chemicals, or shakes with higher concentrations of natural
tannins, may cause accelerated corrosion when in direct contact with aluminum. It is advisable to use an appropriate physical barrier to isolate the alu-
minum from these corrosive chemicals. Accepted barriers include standard roong felt, ice & water shield type underlayment, or 10 mil thick polyethyl-
ene sheeting. Please check with your shake roofer and/or supplier to see if your shakes require these barriers.
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