Standpipe Trap Location - Plumbing - DIY Home Improvement ...

my main stack comes down thru my utility room wall, drops into my crawl space, does a 90 deg turn where it then runs horizontal about 5 ' or so, over to the main drain, then 90 deg down and ties into the main drain. So I end up with a short (approx 5 ft) horizontal stack offset that's right up under the floor joists.

There's an existing 2" wye off this stack offset - I had an extra 2"x3" fitting when I ran the offset so I stuck it in there and just capped the 2" part for future reference - figured it couldn't hurt (otherwise it would end up in the pile of spare parts).

Now I'm looking at a temporary setup for a washer / dryer in the utility room - until I get to fixing up the actual laundry room later (probably much later). Is there any issue with dropping a washer standpipe straight down thru the floor, putting a p-trap under the floor joists, and connecting the trap arm laterally to that "spare" 2" stub?

Rather than cut the stack, add a tee, drill thru a couple studs, etc. to get the trap in the wall, I'm thinking I'll just do the above. Seems like this isn't really much different from a shower trap (under the floor) but the distance from the top of the standpipe to the trap down below is what I'm not sure of - is there a vertical / height restriction related to flow into p-traps?

Related question - can I run a hose from my hot water tank pressure release into the standpipe as well? Using a drain fitting - maybe like the ones for a dishwasher - put it right in the standpipe..?

thanks

Source: http://www.diychatroom.com/f7/standpipe-trap-location-105440/

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