Re: Basement bath
Posted by Gary Swart on July 02, 2004 at 12:10:12:
In response to Re: Basement bath
When a drain clogs, water will backup until if finds an opening. If the toilet clogs, water will not backup into the shower because the shower is downstream from the toilet. If the main line clogs, then water would backup into the shower in this case. A backflow preventer is intended to stop water from backing up the line. My limited experience is that a small amount of debris will prevent the preventer from making a 100% seal. I'd be more concerned about the grade for the drain. If you're using 4" and are close, why not go to 3". That's large enough and should give you added slope, by as HJ says, that won't prevent backup. Also, a shower drain requires a 2", not optional. As Lonnie queried, are you venting everything properly? Might be money well spent to have a plumber in to advise you on this project. It would be most unpleasant to have everything in place and covered with concrete, and find that you erred somewhere. New concrete breaks out easier than old concrete, but it's still a PITA.

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