How Long Should My Roofing Nails Be

Nails of the proper length should penetrate three fourths of an inch into the roof deck.

How long should my roofing nails be. 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. 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. This means that you ll need to use six nails per each truss that runs under the sheathing because each sheet measures 4 feet wide by 8 feet long. In general roofing nails should be long enough to penetrate the wood decking a minimum of 3 4.

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. 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. Use 1 nails in re roof applications when the old roof has been removed and to use 1 nails when overlaying the old roof. The more common roof thickness is 3 4 inch decking.

Nail spacing for sheets of osb and plywood is 8 inches per nail.