Florida s code with its emphasis on minimizing hurricane damage influences the development of codes in other states.
Roofing felt requirments in florida.
Asphalt saturated felt starting at the eaves and lapping upper courses over lower by a minimum of 2 inches.
On roofs with a slope of 4 12 or greater use a single layer of 15 lb.
Asphalt saturated felt starting at the eaves and lapping upper courses over lower by a minimum of 2 inches.
Vertical joints should lap a minimum of 4 inches and be offset by at least 6 feet in successive rows see figure 2 2.
On roofs with a slope of 4 12 or greater use a single layer of 15 lb.
Apply a 19 inch 483 mm strip of underlayment felt parallel to and starting at the eaves fastened sufficiently to hold.