a square in roofing stands for 100 sq ft. so in this case you have 192 sq ft or 1.92 squares. you must also allow for the starter row, cap, and waste. i good rule is to add 10% to your measurements. 192 x 1.10 = 211.2 sq ft or 2.1 squares. this would be 7 bundles of most shingles ( 3 bundles/square)
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When talking about the area of a roof, remember that it is not the same as the square footage of the structure. For example a 20 x 30' building with a 12" overhang and a 4/12 pitch will have 736 sq ft of roof vs only 600 sq ft of slab.
One square of shingles covers 100 square feet. 15 year shingles come 3 bundles to a square. 25 year come 4 bundles to a square.
33 1/3 sqft
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Depends on the brand of shingles. About one bundle per sheet (4'x8') of plywood. some 50 yr shingles use 1 1/4 bundles per sheet.
Three bundles of shingles is equal to 100 square ft. of coverage. So one bundle is equal to 33.3 square of coverage
About 32 square feet. An easy way to remember this is 1 bundle is needed for every 4' x 8' sheet of plywood on your roof. (roughly)