4 rolls per square. 100 square feet to a square.
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.
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.
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.
Here's what I can help you with: 3 roofing squares means 300 square feet (1 square = 100 feet). On a regular basis, one square is covered by 3 bundles of shingles. Roofing felt (1F) is usually supplied in rolls (30 ' of length), with one side covered with sand or synthetic granules. Be aware that there are two kind of felt impregnations: bituminous and tar - there is a distinction between these two. If I were you, I would surely look (and go) for the newest waterproofing membranes, lot more less prone to puncture and tear. I hope this helped. Succes!
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.
There are approximately 86.11 square feet in a roll of felt that is 8 meters x 1 meter. To calculate this, you would first convert the dimensions to feet (8 meters = 26.25 feet and 1 meter = 3.28 feet) and then multiply them (26.25 feet x 3.28 feet = 86.11 square feet).
Wool Felt is the hair that covers the genitilia areas.
It can cover 8 square metres or 86 square feet or 9.567 square yards.
A 400 square foot roll of 15# saturated felt will run from $12-$18, depending on your location.
15 lb. has 400 sq. ft. 30 lb. has 200 sq. ft.
Five--a roll will cover 400 square feet of area.