NRCA has just completed limited testing of nail pull-out resistances in plywood and oriented strand board (OSB) roof sheathing. The purpose of the testing was to determine the influence specific fasteners and sheathing thicknesses have on the pull-out values for nails used to attach asphalt shingles.
NRCA obtained sheets of three thicknesses of plywood sheathing and three thicknesses of OSB sheathing for the testing. All the sheathing was obtained through typical distribution sources and labeled as being exterior-grade, performance-rated products suitable for roof sheathing applications.
NRCA also obtained quantities of two commonly available 1 1/2-inch- (38-mm-) long, hand-driven shingle nail types: a ring-shank shingle nail complying with ASTM F1667, "Standard Specification for Driven Fasteners: Nails, Spikes and Staples," and commodity-grade, smooth-shank shingle nail.