Specs

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April 1
st
, 2015
Mr. Rick Gentry Project Number 115169C
QUICKSCREWS INTERNATIONAL
5830 Las Positas Road
Livermore, CA 94551
Subject: STA18038 All Tile Adjustable 180° Roof Hook Laboratory Load Testing
Dear Mr. Gentry:
As requested, Applied Materials & Engineering, Inc. (AME) has completed load-testing the All Tile
Adjustable 180° roof hook (see Appendix A, Figure 1). The purpose of our testing was to evaluate the
compressive, and tensile (uplift) load capacity of the All Tile Adjustable 180° roof hook attached to a
2"x4" Douglas Fir Rafter using two #14x3" screws.
SAMPLE DESCRIPTION
Mockup samples were assembled in our laboratory on March 26
th
& 27
th
, 2015. Mockup configuration
consisted of three 16" long rafters at 4.5"o.c., screwed to 1/2" Structural I plywood. The All Tile
Adjustable 180° roof hook is attached through the plywood into a rafter with two fasteners. The roof
hook is positioned in the center of the base plate with the 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 March 26
th
, 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 Adjustable 180° roof hook attached to a 2"x4" Douglas Fir rafter using
two #14x 3" screws was determined to be 301 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 0.375 and
13.9 %, respectively.