2 Ply Roofing Felt

Over here its rarer to put a double ply of rubberized bitumen unless you are building a deck on top of it or using it to protect the roofing from pavers and such but properly applied the 2nd ply of bitumen can add 10 years to the product warranty single plys 1 epdm functional more commercial look than residential unless you use white which is newer 2 tpos generally can have issues from what i ve seen of material failure and are harder to repair weld over time.

2 ply roofing felt.

Built up roof membrane 3 ply smooth surfaced. 30 felt type construction helps provide an extra layer of protection between your shingles and your roof deck not included heavy duty design lays flat to help minimize wrinkling asphalt saturation to help improve waterproofing ability to help prevent wind driven rain and water from other sources from infiltrating under your shingles and. The first course starts with an extra 1 2 wide run. This provides two plies across the entire roof with three plies at the headlap.

Built up roof membrane 4 ply gravel surfaced. The lap is half the width of the roll plus one extra inch for headlap. Owens corning roofing and asphalt. So anywhere along the gable end that you can see the felt you ll see two layers.

Ft sbs self adhering cap sheet roll for low slope roofing in shakewood. The standard approach for two ply roofing underlayment is to lap a 36 inch roll by 19 inches. On roof slopes of 2 12 to 4 12 the remainder of the roof shall be two layers of 15 felt applied in shingle fashion or 1 layer of ice dam protection. Owens corning roofing and asphalt.

On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt. By gaf 4 101 02 piece. Owens corning roofing and asphalt. Built up roof membrane 3 ply gravel surfaced.

Ft sbs self adhering cap sheet roll for low slope roofing in slate. Zinc roofing 1 6 lb m ft 2 7 8 kg m 2 copper asphalt composite shingle 4 2 lb m ft 2 20 5 kg m 2 asphalt roll roofing 1 1 lb m ft 2 5 4 kg m 2 felt tar and gravel roofing 3 ply 4 8 lb m ft 2 23 4 kg m 2 felt tar and gravel roofing 4 ply 5 3 lb m ft 2 25 9 kg m 2 felt tar and gravel roofing 5 ply 6 1 lb m ft 2 29. The resisto two ply roofing system is guaranteed for 20 years against any manufacturing defect in the products. By gaf 6 101 02 roll.

Assuming your roofing contractor is using standard 36 wide 15 roofing felt double coverage means that each layer of felt put down across the roof laps 19 over the upper half of the previous course.