Engineering reports - 12 inch (PDF 976K)

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May 9, 2011 Revised on 12/13/2011 to Include Tensile Strength Tests

Mr. Stewart Wentworth Project Number 111204C

QUICK MOUNT PV

936 Detroit Avenue, Suite D

Concord, CA 94518-2539

Subject: Low Slope Mount QMLSH-12 Hardware Load Testing

Dear Mr. Wentworth:

As requested, Applied Materials & Engineering, Inc. (AME) has completed load-testing the QMLSH-12

hardware. The purpose of our testing was to evaluate the shear and tensile load capacity of the QMLSH-

12 hardware attached to a commercially available 2"x4" Douglas Fir rafter.

SAMPLE DESCRIPTION

Nine (9) mockup samples were delivered to our laboratory on April 20, 2011. Mockup configuration

consisted of three 16" long rafters at 7"o.c., screwed to 1/2" Structural 1 plywood. The 12" (finished

height) Quick Mount Standoff (QMSO) hardware is attached through the plywood into the rafter with

two 5/16"x3" lag bolts torqued to 15ft-lbs. Product hardware details are provided in Appendix B.

TEST PROCEDURES & RESULTS

1. Shear Strength Parallel to Rafter

Three samples were tested for shear strength on May 5, 2011 using a United Universal testing machine.

Samples were rigidly attached to the testing machine and a shear load was applied to the 5/16"x1"

machine bolt connected to the aluminum standoff. The samples were loaded parallel to rafter at a

constant rate of axial deformation of 0.01 in./min. without shock until failure occurred. Based on the

above testing, the average ultimate shear load, parallel to rafter, of the QMLSH-12 hardware in Douglas

Fir was determined to be 519 lbf.

The specific gravity and moisture content of the rafter was tested in accordance with ASTM D2395,

Method A (oven-dry). The average specific gravity and moisture content was determined to be 0.477

and 11.5%, respectively. Detailed results are provided in Table I. Test setup and mode of failure are

provided in Appendix A.

Summary of content (14 pages)

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May 9, 2011 Revised on 12/13/2011 to Include Tensile Strength Tests Mr. Stewart Wentworth QUICK MOUNT PV 936 Detroit Avenue, Suite D Concord, CA 94518-2539 Subject: Project Number 111204C Low Slope Mount QMLSH-12 Hardware Load Testing Dear Mr. Wentworth: As requested, Applied Materials & Engineering, Inc. (AME) has completed load-testing the QMLSH-12 hardware.
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Mr. Stuaft Weltu.o|tlt QUICK MOIJNI'PV l - o u S l o p eM o u n tQ M L S H - 1 2I - o a dl e s t i n g M a y O .2 1 1,' P t ' i 1 e cNt u m b e rI l l 2 0 J C 2. ShearStrengthPerpendicularto Rafter Threesamplesweretestedfor shearstrengthon May 5, 2011usinga UnitedUniversaltestingmachine. Sampleswererigidly attached to thetestingmachineanda shearloadwasappliedto the 5/16"x1" machinebolt connectedto the aluminumstandoff.The sampleswere loadedperpendicularto raftet at a constantrateof a-rialdeformationof 0.
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TABLE I LOW SLOPE MOUNT QMLSH-12 12" FINISHED HEIGHT SHEAR LOAD PARALLEL TO RAFTER TEST RESULTS PROJECT NUMBER 111204C 1. SAMPLE ID ULTIMATE SHEAR LOAD PARALLEL TO RAFTER (LBF) RAFTER MOISTURE CONTENT (%) RAFTER SPECIFIC GRAVITY 12PARA-1 553 11.3 0.472 12PARA-2 484 11.8 0.479 12PARA-3 520 11.4 0.480 AVERAGE 519 11.5 0.477 Upper bolt. Page 3 of 13 FAILURE MODE1. AL Base Collar Cracked AL Base Collar Cracked AL Base Collar Cracked ..
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TABLE II LOW SLOPE MOUNT QMLSH-12 12" FINISHED HEIGHT SHEAR LOAD PERPENDICULAR TO RAFTER TEST RESULTS PROJECT NUMBER 111204C SAMPLE ID ULTIMATE SHEAR LOAD PERPENDICULAR TO RAFTER (LBF) RAFTER MOISTURE CONTENT (%) RAFTER SPECIFIC GRAVITY 12PERP-1 344 11.3 0.471 12PERP-2 330 11.6 0.452 12PERP-3 456 11.3 0.477 AVERAGE 377 11.4 0.467 Page 4 of 13 FAILURE MODE Plywood Buckled/Bent Machine Bolt Plywood Buckled/Bent Machine Bolt Plywood Buckled/Bent Machine Bolt ..
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TABLE III LOW SLOPE MOUNT QMLSH-12 12" FINISHED HEIGHT TENSILE LOAD TEST RESULTS PROJECT NUMBER 111204C SAMPLE ID ULTIMATE TENSILE LOAD (LBF) RAFTER MOISTURE CONTENT (%) RAFTER SPECIFIC GRAVITY FAILURE MODE 7PULL-1 2807 20.7 0.402 Lag bolt pull-out 7PULL -2 3283 22.0 0.476 Lag bolt pull-out 7PULL -3 3003 20.0 0.430 Lag bolt pull-out AVERAGE 3031 20.9 0.436 ..
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APPENDIX A Page 6 of 13
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LOW SLOPE MOUNT QMLSH-12 12" FINISHED HEIGHT SHEAR TEST SETUP PROJECT NUMBER 111204C Load Orientation Test Rafter Loading Fixture Lag Bolts Machine Bolt Figure 1a. Shear Parallel to Rafter Load Orientation Figure 1b. Shear Test Close-up Test Rafter Lag Bolts Figure 2a. Shear Perpendicular to Rafter Page 7 of 13 Figure 2b.
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LOW SLOPE MOUNT QMLSH-12 12" FINISHED HEIGHT FAILURE MODES PROJECT NUMBER 111204C Figure 3. Cracked Aluminum Base Collar Shear Parallel to Rafter Figure 4.
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APPENDIX B Page 9 of 13
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LOW SLOPE MOUNT QMLSH-12 12" FINISHED HEIGHT HARWARE SPECIFICATION PROJECT NUMBER 111204C Page 10 of 13
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APPENDIX C Page 11 of 13
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LOW SLOPE MOUNT QMLSH-12 12" FINISHED HEIGHT LOAD TEST SETUP PROJECT NUMBER 111204C Load Orientation Tensile Test Page 12 of 13
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Report Revision History 12/13/2011 Page 2: Pages 1 & 3: Page 5: Page 11: Page 13 of 13 Tensile strengths tests added Editorial revision Table III added Appendix C added
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2700 Mitchell Dr., Bldg. 2 Walnut Creek, CA 94598 www.quickmountpv.com 925-478-8269 November 20, 2013 Engineering Letter ! Stamped Engineering Test Reports Do Not Expire To whom it may concern, Quick Mount PV offers extensive testing for all our products conducted by a third-party licensed professional engineer. All our third-party engineering reports are stamped by a licensed professional engineer at the time the reports were prepared and do not expire.