How Long Should My Roofing Nails Be

The more common roof thickness is 3 4 inch decking.

How long should my roofing nails be.

Nail spacing for sheets of osb and plywood is 8 inches per nail. 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. More than 1 layer of roofing not recommended over 3 8 sheathing. In general roofing nails should be long enough to penetrate the wood decking a minimum of 3 4.

Nails of the proper length should penetrate three fourths of an inch into the roof deck. 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. 4 feet equals 48 inches which you then divide by 8 to determine that you ll need six nails where the board comes in contact with a truss. 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.

For reroofing shingle over shingle or hip and ridge application it is necessary to use minimum 35 mm long roofing nails.