Specs

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September 17, 2015
Mr. Rick Gentry Project Number 115727C
QUICKSCREWS INTERNATIONAL
5830 Las Positas Road
Livermore, CA 94551
Subject: QS# 17585 –All Tile Roof Hook 90° Laboratory Load Testing
Dear Mr. Gentry:
As requested, Applied Materials & Engineering, Inc. (AME) has completed load-testing the All Tile
Roof Hook 90° (see Appendix A, Figure 1). The purpose of our testing was to evaluate the compressive
tensile (uplift) and shear (parallel to rafter) load capacity of the All Tile Roof Hook 90° attached to a
2"x4" Douglas Fir Rafter using two 5/16"Øx3" screws.
SAMPLE DESCRIPTION
Mockup samples were assembled in our laboratory on August 31, 2015. Mockup configuration consisted
of three 12" long rafters at 4.5"o.c., screwed to 1/2" Structural I plywood. All Tile Roof Hook 90° is
attached through the plywood into a rafter with two fasteners installed at the farthest end.
TEST PROCEDURES & RESULTS
1. Compressive Load Test
A total of three tests were conducted for compressive load capacity on September 11, 2015 using a
United Universal testing machine. Samples were rigidly attached to the testing machine and a
compressive load was applied to the hook. The samples were loaded in compression at a constant rate of
axial deformation of 0.09 in. /min. without shock until the hook was bent and came in contact with the
test board; displacement at maximum load was recorded. Based on the above testing, the average
maximum compression load of the All Tile Roof Hook 90°attached to a 2"x4" Douglas Fir rafter using
two 5/16"Øx3" screws was determined to be 395 lbf. Detailed results are provided in Table I. Test setup
and mode of failure are provided in Appendix B, Figure 1.
The specific gravity and moisture content of the rafter was tested in accordance with ASTM D2395,
Method A (oven-dry). The specific gravity and moisture content were determined to be 0.379 and
10.0%, respectively.