You must place nails in the proper location and drive them flush with but not cutting into the shingle.
Proper way to nail roof shingles.
However make sure that you do not nail into the tar strip.
In all use four nails per 3 tab shingle.
So your next course of shingles should cover the nails by 1 inch vertically.
Nailing the shingles correctly is critical to the roof system s wind resistance.
Hammer in one nail about 2 inches from each end of each shingle and another nail about 1 inch above each cutout.
Nail the cut off shingle into place about 6 inches from its lower edge.
For all owens corning shingles roofing nails should penetrate into the wood deck by a minimum of inch or completely through the roof deck by a minimum of 1 8 inch.
When nailing shingles proper penetration into the roof deck is essential to ensure the nail and shingle remain secure.
Hammer one nail about 2 inches from each end of a shingle.
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Be mindful of the proper nailing technique so that your nails always hold the top edge of the course beneath it.
General guidelines for nailing shingles.
Proper nail placement is also a requirement for the shingles limited warranty coverage.
Then secure another nail an inch above each cutout.