How Long Should My Roofing Nails Be

In general roofing nails should be long enough to penetrate the wood decking a minimum of 3 4.

How long should my roofing nails be. More than 1 layer of roofing not recommended over 3 8 sheathing. 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. Nails of the proper length should penetrate three fourths of an inch into the roof deck. Use 1 nails in re roof applications when the old roof has been removed and to use 1 nails when overlaying the old roof.

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. When installing asphalt shingles on felt only to any grade decking you should use 1 inch long roofing nails. For reroofing shingle over shingle or hip and ridge application it is necessary to use minimum 35 mm long roofing nails. 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.

The more common roof thickness is 3 4 inch decking.