Unlike Amazon Prime, Amazon Business will be free to verified business customers, offering features such as bulk pricing, free two-day shipping on orders worth more than $49, and access to products not available to typical retail consumers.
Roof shingles are sold by both the bundle and by the square. A square of shingles is the quantity needed to cover 100 sq. ft. of roof. Shingles are packaged in paper- or plastic-wrapped bundles designed to be light enough for a person to carry, so heavier shingles require more bundles per square.
This article teaches you the math formula to figure out how much roofing and underlayment you need to order. Roofing is talked about using the term square, as in This shed roof is 16 squares. A square refers to 100 square feet of roof or a 10 foot by 10 foot area. So a roof that has 1600 square feet of area has 16 squares. Remember that unless the roof is flat, the square footage of the building is different than the square footage of the roof. This is because of the pitch of the roof and the overhangs.