Roofing Felt Overlap Size

In steep slope roofs 4 12 and steeper the upper courses of felt underlayment should overlap lower courses by at least 2 inches.

Roofing felt overlap size.

The overlapping felt creates a secondary barrier for moisture and wicks water away from the shingles above and the sheathing below. The drip edge should extend at least 2 inches on the roof. Convert the area from inches to feet prior to purchasing your felt. Pick up the roll with both hands.

In most cases this will leave 400 square feet 37 m 2 of net coverage per 1 roll. Roofing requirements roofing felt is required to overlap 2 inches over the lower felt course. The spacing between the nails on the drip edge should be less than 12 inches apart. Never walk on felt that has not been nailed down.

Roll out the felt no more than midway perhaps 25 feet or so across the average size roof. Adjacent pieces of drip edge should overlap at least 2 inches 51 mm. Therefore a 2 inch overlap provides redundancy at the edges where the barrier is weakest. Overlap the end of a roll about 4 inches with the start of a new roll and fasten both pieces to the.

Continue along the roof to the other end and trim the felt flush at the end with a utility knife. If there is any wind at all roll out the felt only about 10 feet. One roll of conventional 15 felt covers 432 square feet 40 1 m 2. However you must allow for overlaps on joints.