Some roofers prefer to attach felt underlayment with 1 inch roofing nails or special nails with plastic washers but most codes allow staples which are easier to drive.
How to install tar paper on a roof.
Roofing felt prevents the deck from being exposed to the elements before or while the shingles are being applied.
Lay the first course of tar paper lengthwise on the roof so one edge is covering the drip edge nailed to the roof.
Staple it to the plywood with a staple gun placing the staples at 6 to 8 inch intervals along the edges and in the middle of the paper.
Whether you re building a new house or putting a new roof on your existing house installing tar paper first helps waterproof the roof and prevent leaks.
Place a final piece of tar paper over the top of the roof attaching it so it overlaps the tar paper on both sides of the roof.
How to install roofing tar paper.
Unroll the paper on the roof and cut it to the correct length with a utility knife.