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 vertical leg of the drip edge should be at least 1 5 inches wide and extend at least 0 25 inches below the sheathing. Convert the area from inches to feet prior to purchasing your felt.

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Purchase enough felt to cover your roof s area.

Roofing felt overlap size.

You can see the difference between the underlayment overlapped 19 inches on the roof to the right and overlapped 2 inches on the roof to the left. Roofing requirements roofing felt is required to overlap 2 inches over the lower felt course. The drip edge should extend at least 2 inches on the roof. Therefore a 2 inch overlap provides redundancy at the edges where the barrier is weakest.

In most cases this will leave 400 square feet 37 m 2 of net coverage per 1 roll. One roll of conventional 15 felt covers 432 square feet 40 1 m 2. In steep slope roofs 4 12 and steeper the upper courses of felt underlayment should overlap lower courses by at least 2 inches. Continue along the roof to the other end and trim the felt flush at the end with a utility knife.

Roll out the felt no more than midway perhaps 25 feet or so across the average size roof. The spacing between the nails on the drip edge should be less than 12 inches apart. If there is any wind at all roll out the felt only about 10 feet. Never walk on felt that has not been nailed down.

However you must allow for overlaps on joints. Overlap the end of a roll about 4 inches with the start of a new roll and fasten both pieces to the. Adjacent pieces of drip edge should overlap at least 2 inches 51 mm. Pick up the roll with both hands.