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Dec 4, 2012 at 16:34 vote accept Luiz Borges
Nov 9, 2012 at 3:56 history edited Hank CC BY-SA 3.0
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Nov 8, 2012 at 4:46 comment added Hank @LuizBorges: I think that plan sounds fine as long as you appropriately size the gutters and downspouts. You need to make sure the water can leave the roof faster than it's accumulating. That depends on: 1) the size of the roof, 2) the maximum rainfall rate in your area (e.g. inches per hour), and 3) the number and size of downspouts. But gutter sizing is not specific to flat roofs, so you should have no trouble finding that info.
Nov 8, 2012 at 2:00 comment added Luiz Borges I know that it can't be really flat. In my EDIT in the question I asked about another option, using gutters in one side with the whole roof sloped down to it. Is that technique used?
Nov 7, 2012 at 23:47 history answered Hank CC BY-SA 3.0