How Long Should My Roofing Nails Be

Use 1 nails in re roof applications when the old roof has been removed and to use 1 nails when overlaying the old roof.

How long should my roofing nails be.

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. 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. 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. 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. 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. The more common roof thickness is 3 4 inch decking. Nails of the proper length should penetrate three fourths of an inch into the roof deck.

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