• There are two types of tar paper: #15 and #30. For every 100 square feet of tar paper, the #15 weighs about four pounds and the #30 weighs about nine pounds. Both types come in rolls. The #15 rolls are 144 feet long and three feet wide. The #30 rolls are about 72 feet long and 18 inches wide.


    Roof Help: Calculating Materials

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