Any bakery that would produce 30 lb rolls with feet in them
would have been closed down long ago.
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Easy way to figure it: If the roll is 3 feet by 100 feet, it would cover 300 square feet. But you have to overlap it about 6 inches at top and bottom, so once you subtract that, it would cover about 200 square feet., When figuring a job, add some for overlap at valleys, chimneys, etc. . . Hope this helps. A standard roll of 30# felt covers 216 square feet; one-half the area of a roll of 15# felt, which covers 432 square feet. Rows are overlapped 2 inches, not 6 inches.
15 lb. has 400 sq. ft. 30 lb. has 200 sq. ft.
2.5 feet are in 30 in.
15 lb. 400 sq. ft. 30 lb. 200 sq. ft.
Feet and linear feet are the same measurement. Therefore, 30 feet is equal to 30 feet.