On Wed, 21 Oct 2009 16:48:17 -0400, Aaron Fude
wrote:

Wayne Whitney wrote:
he maximum height.

If you really can't make that work, then the only alternative is an
ejector pump.

Yours,
Wayne



Thanks for the responses. Here's my situation.


The washer is in the basement. The 4" cast iron drain runs 18" below the
ceiling. So to have a 36" standpipe I would need to go through the
ceiling and into a bay in the wall on the first floor, which I can't do
because my wall sit on steel beams.

Thanks!

Aaron
36" standpipe is to get above "flood level". At 18" below the ceiling
you are already well up there.

You say 18" below the ceiling. Is the ceiling level the subfloor
above, or below the floor joist? If it is below the joist you have
another 8" +/- available. What drains are already available (what taps
into the 4" CI pipe) and where? If you have a drain coming into the
pipe that you can tap into I'd put a "T-Y" in and then a trap with as
much "standpipe" as you have room for. If you are within a couple feet
of the "stack" you may not need aditional venting if the standpipe is
between something like 18" and 40" horizontally from the main drain.

Or you MAY need the "cheater vent" to keep the trap from being sucked
dry.

I tried to bounce this off a friend of mine who is a retired plumber
but he's not in at the moment. I'll see what he says when he gets in.