What is a roofing square? Essentially it is 100 square feet or a 10Ã10â² block. Because roofs, siding and other big projects are â¦ well, big, using a square foot as a unit of measurement gets complicated. Also, roofing and siding are a commodity now days, so even if you are off by a few sq. feet, it is fine. Itâs not marble flooring, where each tile costs $20 + installation, and when you are off by 30 sq. feet, you can be down $1000.
You get up to 3.3 ounces for standard rate mail! First class mail postage cost is calculated by the ounce so be careful to check the weight first. If you are sending flats standard rate, your postage cost will be about 34 cents to 49 cents per piece depending on your list.
Right now an average letter of normal dimensions and weight, costs 45 cents. â¦Postcard rate is 32 cents, so you would need two stamps. Postage stamps are just like money, as long as it adds up to the current rate, even stamps that are 20 years old are valid. But a first class stamp twenty years ago was 24 cents. It's value doesn't change... it is still 24 cents.