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Roofing-nail-length, if you are putting a layer of asphalt shingles over an existing layer of asphalt shingles on to a 3/4-inch deck or a plank deck then you should be using 1 1/2-inch nails. if your decking is less than 3/4 inch then a 1 1/2-inch nail will suffice.. Roofing nails, roofing nail sizes, sheathing,3d box, 4d box, 5d box, 6d box, what size roofing nails, composition shingles, wood shakes, wood shingles., nails that are longer than six inches are called pikes and they are seldom used on roofs. the most commonly used roofing nails range from one to two inches in length. if you need bigger nails including pikes, you may need to place a special order at the hardware store. the one to two inch roofing nails are suitable for most types of roof shingles..

The specification for this states that on plywood or osb roof decks, the nail shall penetrate past the point with the shank exposed. on lumber type decking, then a minimum of 3/4" penetration and a irregular nail shank. this 3/4" spec is most used 'round here for exposed decorative tongue and groove decking. system november 19, 2014, 9:56pm #5, standard lengths are between 1 and 2 inches (2 and 5 centimeters) but they are also available at lengths of up to 6 inches (15 centimeters). the length of the nail is the shank, and the shank can also vary. screw shank nails are twisted and have sharp diamond tips, and they are used to securely fasten wood roofs..

"how long of a nail is use on a new roof if plywood is 7/16" thick " ----- code requires an 8d (2-1/2" x 0.131") 6" and 12" on center for that plywood (since no mention of roofing material, tile slate, wood shingle, asphalt shingle, etc.... chapter 6 - wall construction, roofing nails, minimum 12-gage [0.105 inch (3 mm)] shank with a minimum 3/8-inch-diameter (9.5 mm) head, complying with astm f1667, of a length to penetrate through the roofing materials and not less than 3/4 inch.

Why is 1-1/4" length of nail the “standard”? the nails protruded through the boarding board rendering the “sheathing” (1. a barrier, and 2. substrate for affixing) into a perforated substrate. the protruding 1/4" nails are ugly and dangerous., if you are using roof sheathing that is 3/4" or thicker, then the nail must penetrate 3/4" min. into the sheathing. if you are using an approved roof sheathing that is less than 3/4", like 7/16 osb or 3/8" plywood, then the nail must go all the way through..

The length of each nail must be a minimum of 1¼ inches long, and for roof-overs, atlas recommends a nail length of at least 2 inches. nails of the proper length should penetrate three-fourths of an inch into the roof deck.