Effects of Test Methods and Exposure Conditions on Lateral Nail and Staple Resistance of Wood-Base Panel Materials

Three test methods were compared as to their suitability for determining the lateral nail resistance of wood-base panel materials: the standard ASTM Dl037 method, the American Plywood Association (APA) performance method, and a newly developed method in which a reinforced steel bar replaces the 6d nail. Lateral staple resistance was also measured by a modified Forest Products Laboratory (FPL) test method. Plywood, composite plywood, waferboard, oriented strandboard, and hardboard siding were evaluated. Edge distances were 1/2 and 3/8 inch. The steel bar method was the most efficient and reliable test to determine lateral nail resistance. Its only shortcoming is the extra step needed to machine a slot in each specimen in order to fit the test jig. The ASTM Dl037 test was slower, but reliable, since the nail-bending problem did not affect the maximum lateral nail resistance value. The APA test produced results between 60 and 70 percent of the Dl037 and steel bar tests. The APA lateral nail test and the FPL lateral staple test produced a fastener head pull-through type failure. This indicates that further study is needed to determine whether or not a relationship exists between lateral fastener resistance and the ASTM D1037 fastener head pull-through test results. The ASTM 24 hour water soak and six cycle accelerated aging exposure reduced lateral fastener resistance about 30 and 40 percent.

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