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500 square would be 50,000 square feet. Not knowing in what context this is used, it could be that it should read or mean 500 square feet which would be a small roof. 50,000 is a very large roof. Shingles are figured in squares. 1 square is 100 square feet made from 3 bundles of shingles on average. That is just how a roof is figured so that there is a common reference point.

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15y ago

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