Flat roofs. Are they supposed to have water after rain and it evaporates? Or does the flat roof have something on it to help standing water drain?
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“Flat” roofs generally are designed with a very slight slope so water drains, but in practice that slope is so small that as the building settles and shifts just a tiny amount, it becomes so flat the water is trapped. That’s why flat roofs leak a lot more than pitched roofs.
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