You would require a "depressed floor", otherwise there is no way to get "slope to drain" and the overflow would simply go out the door unless there was a "curb" at the doorway to stop the flow which of course doesn't meet code. Most homes aren't built with depressed floors; especially at above grade floors.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)