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Advanced Support Products, Inc. page 3 of 3 2 Dry Rubber 40.4 0.81 3 Dry Rubber 37.8 0.76 4 Dry Rubber 41.6 0.83 5 Dry Rubber 39.4 0.79 Average 39.1 0.78 HDPE Base Test No. Surface Condition Force Applied Coefficient of Friction 1 Wet Rubber 35.5 0.71 2 Wet Rubber 37.5 0.75 3 Wet Rubber 38.2 0.76 4 Wet Rubber 35.1 0.70 5 Wet Rubber 34.4 0.69 Average 36.1 0.72 HDPE Base/Rubberized Bearing Pad (Epoxied) Test No. Surface Condition Force Applied Coefficient of Friction 1 Wet Rubber 35.7 0.71 2 Wet Rubber 34.1 0.68 3 Wet Rubber 33.4 0.67 4 Wet Rubber 33.8 0.68 5 Wet Rubber 34.1 0.68 Average 34.2 0.68 HDPE Base/Rubberized Bearing Pad (Non-Epoxied) Test No. Surface Condition Force Applied Coefficient of Friction 1 Wet Rubber 37.4 0.75 2 Wet Rubber 37.8 0.76 3 Wet Rubber 38.7 0.77 4 Wet Rubber 38.3 0.77 5 Wet Rubber 37.3 0.75 Average 37.9 0.76 From these results, it is clear that a coefficient of static friction of .053 is conservative. The lowest individual reading of any of the 60 test pulls has a coefficient of .053. This is in the case of a bare HDPE base on wet concrete. It is the understanding of this engineering firm that the bare base is never in contact with the roof. A bearing pad is always utilized. The highest average reading for a bare HDPE Base with Rubberized Epoxied Bearing Pad was 1.02 on dry concrete. The lowest average reading was .076 on wet rubber. This assembly was very consistent for all surfaces. Applying epoxy to the pad did not improve the friction factor for all of the utilizations that the product is likely to encounter. It is therefore recommended that the pad not be epoxied to the base. This is the typical application. Using a coefficient of static friction of .053 is conservative. Using a coefficient of .070 is recommended.