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On many of the homes we work on, at least one area of the roof is “flat.” Of course, no roof is supposed to be completely flat. By code, a roof must be sloped at least 1/4 inch per foot of run. In our remodeling work, however, we frequently run into existing roofs that are not sloped well.
In one recent case, not only were parts of the roof dead flat, but it had only tiny, 5-inch-by-5-inch scuppers through the parapet wall. (You can’t see this parapet roof from anywhere on the property, and there was no functional or design reason to have a parapet wall there, but it was on the original plans.)