Roll the tar paper along the outer edge of the roof. Keep the rough edge up and the dull, adhesive edge facing down against the plywood sub-flooring. Once installed, the sun will melt the adhesive, and the tar paper will adhere to the sub-roofing.
Staple the tar paper into place using the staple gun. Staple one staple every 12 to 16 inches.
Cut the tar paper even with each perpendicular edge of the roof using the carpenter's razor.
Roll the second roll of tar paper parallel to the first, allowing for a 6 to 8-inch overlap, so that the adhesive side will warm in the daytime and adhere to the underlying layer of tar paper.
Staple the tar paper into place using the staple gun. Staple the overlap onto the underlying tar paper.
Lay additional rolls of tar paper parallel to the outer edge of the roof, working toward the top of your roof while continuing to overlap each row with previously laid tar paper. Staple each row into place using the staple gun.
Stop laying rolls of paper when you get to within one row of the roof's peak.
Layer the opposite angle of the roof with tar paper until you reach within one row of the roof's peak.
Center the final strip of tar along the peak the roof, folding it over, so it lays on both sides of the house and overlaps the lower rows of tar paper.
Staple the top layer into place using a staple every 12 to 16 inches.