R-115. Maze STORMGUARD Plain and Ring Shank Cedar Shake and Shingle Nails are Double Hot-Dip Galvanized ? which conform to ASTM Standard A153, Class D and conform to the nail specifications of the Cedar Shake and Shingle Bureau for non-saltwater areas. These slender, stiff nails resist splitting, bending and effectively resist rust. Nails should be long enough to penetrate sheathing at least ??. Use only two nails per shake or shingle approximately ?" from edge and 1-1/2? above the butt line of the next course. Nails should be driven flush, but not so far that the nail head crushes the wood. Excellent for typical, non-coastal (over 15 miles from salt-water) residential applications not utilizing pressure-impregnated preservative or fire-retardant treatments. Check with treater for current, specific fastener requirements. Type 316 Stainless Steel nails must be used in those severe conditions.