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.
Hammer one nail about 2 inches from each end of a shingle.
Make sure to keep nails out of the tar strip as you work.
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.
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.
In all use four nails per 3 tab shingle.
So your next course of shingles should cover the nails by 1 inch vertically.
However make sure that you do not nail into the tar strip.
Be mindful of the proper nailing technique so that your nails always hold the top edge of the course beneath it.
Proper nail placement is also a requirement for the shingles limited warranty coverage.
Nail the cut off shingle into place about 6 inches from its lower edge.
When nailing shingles proper penetration into the roof deck is essential to ensure the nail and shingle remain secure.
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Also place a nail 2 inches from each end of the shingle in line with the other two.