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A 1/4" per foot is standard, therefore in twenty feet the furthest point would be 5" below the high point. You can make it flatter (3 or 4 inch drop) but it would require greater perfection in concrete placement, perhaps beyond reason.

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โˆ™ 2006-08-26 02:09:49
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Q: What should the pitch of your patio cover be if the patio is 20ft by 20ft?
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