First use the nails with the large plastic heads. This is best for actually holding down the felt.
lay down your first course of tar paper and nail it on both top and bottom. Then the overlap course, nail it at the overlap and every 2 feet.
Your intention is just to hold it in place and not load it with nails so when your applying the shingles your not constantly hitting nail heads.
Do the operlaps only and every 24 inches or so.
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