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.
The current postage needed for an international postcard stamp is $1.15 for a standard shaped and size one, in fact it's the same price for a letter of 1oz or less. The USPS lowered the rate from $1.20 back to $1.15 in middle of 2016.