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Improperly 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 underdriven, simply drive it down flush with your hammer.

Nails should be located within 1/2" of the Nail Line located on the shingle. Nails on the ends should be 1" in from the edge.