Roofing Square Explained. The term roofing square and roof pitch are the most commonly used terms in the roofing industry. 1 roofing square = 100 square feet. It does not matter how you arrive at 100 square feet. 10 feet x 10 feet = 100 square feet or 1 roofing square. 5 feet x 20 feet = 100 square feet or 1 roofing square.
How much does it cost to produce 1 gallon of ethanol?It will cost about $1.10 to $1.20/gal to make the alcohol from various feed-stocks like corn, barley, potatoes, or Jerusalem artichokes. You will also have by-products which you can sell or use as animal feed, reducing the total cost down to about $.95/gal.. If you do this on a large enough scale, it will cost anywhere form $0.95/gallon to $1.40/gal to make the alcohol, depending on your feedstock. Look at my web pages, Mashing and Fermentation and also,  Molasses and Rum .
Understanding the federal alcohol tax at a glance is not easy. For instance, wine is taxed at six different rates depending on its percentage of alcohol by volume or whether it is sparkling. The range for the wine tax is between $0.226 and $3.40 per gallon. Beer is taxed at a single rate of $18 per barrel (31 gallons). And spirits are taxed at $13.50 per gallon, though the law gives credit for wine and flavor content in spirits.