Five--a roll will cover 400 square feet of area.
When talking roofing materials. A square is considered a 10'x10' area or a 100 square feet. So you have 1,900 square feet. There are two basic types of felt: 15lb and 30lb felt. 15lb felt covers 4 sq= Total needed will be 5 rolls 30lb felt covers 2 sq= Total needed will be 10 rolls (*note, 30lb is more thick and better for your roof.
4 rolls per square. 100 square feet to a square.
Roofing paper, or felt, normally comes in about 150ft rolls and are 3ft wide. Figure about 450 square feet of felt. Remember when estimating required amounts that you need to overlap the felt about 6 inches or so. With an overlap of 6 inches, 1 roll has a coverage of about 375 square feet.
A Standard roll of 30lb felt will cover 2 square or 200 sq ft
1 square = 100 square feet x 8 squares = 800 square feet. 15# felt comes in different sizes. Multiply the length of the roll x the width of the roll to find out how many square feet are in a roll. 800 divided by the square feet per roll = how many rolls you need.
15 lb. has 400 sq. ft. per roll and 30 lb. has 200.
It can cover 8 square metres or 86 square feet or 9.567 square yards.
616 yards
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.
The answer is rather simple. Even though a billiard ball is smooth, when it rolls it imparts some of its kinetic energy to the felt covering of the table. That is, the felt heats up a bit as the ball slows down.
she felt like it