How Long Should Roofing Nails Be

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How long should roofing nails be.

Do the nails really have to be 3 long. The thickness of the nail is directly proportional to its length thus the longer the nail the bigger its size. Hired a roofing company last week. Roofing nails range from one to six inches in length.

But the nails they will use are 3 why so big. Use 1 nails in re roof applications when the old roof has been removed and to use 1 nails when overlaying the old roof. Continue reading below our video of the day. They do specify the shank to be 11 12 gauge the head diameter to be st least 3 8 but no specs on how long the shaft needs to be after passes through a 7 16 or 3 8 sheathing.

Wood shakes minimum 3 4 sheathing wood shakes nail type minimum length 18 straight split 5d box 1 3 4 18 and 24 handsplit and resawn 6d box 2. In general roofing nails should be long enough to penetrate the wood decking a minimum of 3 4. 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. Nails that are longer than six inches are called pikes and they are seldom used on roofs.

We have to use 30 mm long nails if we are installing thicker shingles like the laminated shingles cambridge xpress or cambridge xtreme 9 5. There going to nail down some 1 inch poly iso roofing insulation. The length of each nail must be a minimum of 1 inches long and for roof overs atlas recommends a nail length of at least 2 inches. More than 1 layer of roofing not recommended over 3 8 sheathing.

The more common roof thickness is 3 4 inch decking. When installing asphalt shingles on felt only to any grade decking you should use 1 inch long roofing nails. Nails of the proper length should penetrate three fourths of an inch into the roof deck.