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 roofing nails be.
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More than 1 layer of roofing not recommended over 3 8 sheathing.
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.
When nailing very thin materials into wood a minimum of 1 2 of penetration is necessary.
When installing asphalt shingles on felt only to any grade decking you should use 1 inch long roofing nails.
This is a reasonable guide most of the time.
If you want to hold 1 2 drywall to a stud wall the length of the nails should be at least 1 1 2.
In general roofing nails should be long enough to penetrate the wood decking a minimum of 3 4.
Continue reading below our video of the day nails that are longer than six inches are called pikes and they are seldom used on roofs.
Nails of the proper length should penetrate three fourths of an inch into the roof deck.
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.