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. Purchase enough felt to cover your roof s area. Convert the area from inches to feet prior to purchasing your felt.

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In most cases this will leave 400 square feet 37 m 2 of net coverage per 1 roll.

Roofing felt overlap size.

Therefore a 2 inch overlap provides redundancy at the edges where the barrier is weakest. If there is any wind at all roll out the felt only about 10 feet. Roofing requirements roofing felt is required to overlap 2 inches over the lower felt course. Adjacent pieces of drip edge should overlap at least 2 inches 51 mm.

One roll of conventional 15 felt covers 432 square feet 40 1 m 2. The drip edge should extend at least 2 inches on the roof. The overlapping felt creates a secondary barrier for moisture and wicks water away from the shingles above and the sheathing below. Roll out the felt no more than midway perhaps 25 feet or so across the average size roof.

In steep slope roofs 4 12 and steeper the upper courses of felt underlayment should overlap lower courses by at least 2 inches. Pick up the roll with both hands. Never walk on felt that has not been nailed down. 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.

Continue along the roof to the other end and trim the felt flush at the end with a utility knife. The spacing between the nails on the drip edge should be less than 12 inches apart. Overlap the end of a roll about 4 inches with the start of a new roll and fasten both pieces to the. However you must allow for overlaps on joints.