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.
If your sending letters to people all over the country, your postage cost will be between 21 cents each and 27 cents each. These bulk mail rates are for letter size mail (up to 6.125 x 11.5 landscape only, if you turn it into a portrait orientation it becomes a flat and your postage will increase).
The postage on an 1.3 ounce letter would cost you about 61 cents to 74 cents depending on where you may live, and what their costs are.ou are looking at around $0.70 for postage of  that letter. Just bring a dollar and yo â¦ u should be fine! If you use  a postage meter, there is a 1 cent discount. so the total is $.69.