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SGS U.S. Testing Company Inc.
CLIENT: The Clarke Group The inspection of the test deck was conducted by Quality Auditing Institute (QAI) at Green River Log Sales Ltd. In Mission, B.C. The following sample construction details have been reported in QAI's letter dated November 08, 1999 by Mr. Steven Harris. Materials The test deck was constructed using- 24" by %" heavy hand-split and re-sawn shakes. The thickness of the shakes ranged from ¾" to 15/16". Application The shakes were applied at 10" exposure to a 11-mm plywood deck using 15 lb interlay felt. The shakes were extended to and were flush with the edges of the deck. The plywood decking was securely fastened to a nominal two by four wood batten frame with an additional nominal two by four vertical support batten. The perimeter support battens were located under and flush with the outer edge of the deck. TEST PROCEDURE The test program was conducted in a laboratory environment maintained at 70°F and 50% Relative Humidity. The sample was tested after conditioning in the test environment for at least 24 hours prior to conducting the test. The submitted test deck was placed on a level concrete surface and fixtured from movement. Six (6) locations were selected marked as impact locations. Steel balls of 1.25 in., 1.5 in., 1.75 in., and 2.0 in. were dropped from various heights through 2" or 3" diameter PVC pipes, as detailed in the table below. For each ball-drop height impact configuration, two (2) coincident impacts were made on each of the 6 selected impact locations.
After the first drop at each location, the resultant depression was measured using a depth gage. After all the drops were completed the entire test deck the impacted shakes were carefully removed and examined on both the top and bottom surfaces for visual damage. |
