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.
It takes 3 bundles to cover a square if you use 3-tab shingles, the most common type. 4. Account for waste. Add 10 percent to the shingle estimate to account for waste. 1  If your roof has hips and valleys, make it 15 percent because of waste in cutting shingles to fit the valleys.