driving the nails can lead to shingle damage, blow-offs, and unsightly appearance. Nails
should be placed within 1/2" of the nail line on three-tab shingles, and 1/4" on
most dimensional shingles. Below is a diagram showing how to properly drive the nail. If
you have an improperly driven nail, don't worry about removing it, just properly set
another nail next to the improper one, and caulk the head of improper one. If the improper
nail is under driven, simply drive it down flush with your hammer.