Adding standpipe to vented shower run

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Charles2000

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After laying out my shower drain run I got the bright idea that I could easily splice in a washer standpipe for the garage, through the band joist.

I stubbed together the layout below to illustrate my question. The section on the far right is for my proposed washing maching standpipe and P-trap outside, but if this is a "no go" I'll remove it altogether.



This 2" run would connect through the lower Y to the 3" vertical stack, below the toilet described here:
https://terrylove.com/forums/showthread.php?t=31332
BTW the SanT on its back for the shower vent is just for this illustration, I don't have the SanY + 1/8 bend right now.

As always, thanks in advance for your attention,
Charles
 
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Charles2000

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Jeez, here's the pic

Sorry, I didn't mean to post that. I had trouble getting the picture to embed.
I hope this works.

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After laying out my shower drain run I got a bright idea (actually, my buddy's wife suggested it -- I'll take any blame, though) I could easily splice in a washer standpipe for the garage, through the band joist.

I stubbed together the layout below to illustrate my question. The section on the far right is for my proposed washing maching standpipe, but if this is a "no go" I'll remove it altogether.

Shower.JPG

This 2" run would connect through the lower Y to the 3" vertical stack, below the toilet described here: https://terrylove.com/forums/showthread.php?t=31332


BTW the SanT on its back for the shower vent is just for this illustration, I don't have the SanY + 1/8 bend right now.

As always, thanks in advance,
Charles
 
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NHmaster

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It's fine and as long as the san tee for the vent is dry above it's fine also.
 

hj

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The way you have it assembled it looks like the washer trap would be below the floor. That is usually a bad idea for several reasons, one being that the standpipe would exceed the maximum allowed by most codes. Your idea is okay, the execution might use some cleaning up.
 

Charles2000

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Thanks!

Thanks nhmaster & HJ,

Very reassuring!

nhmaster: The 1-1/2" vent for the shower is dry and comes off at 45° from horizontal, I'll review my understanding of when that's appropriate for a horizontal run.

HJ: The 2" piece for the standpipe P-trap will emerge through the band joist at 17-18" above the garage floor. I think that puts it in the sweet spot.

Your idea is okay, the execution might use some cleaning up.

This is the best time for me to improve that! :) Do you mean like running the whole thing more horizontally?

The arrangement below raises some havoc with the shower vent connecting at no less than 45°, shoving everything over and down some, but can be pursued.
standpipe.JPG

LOL, So far the only improvements I come up with are:
-- Show some "meat" showing between joints in case of future cutoff
-- Remove unsightly price tags

Again, Thanks lots,
Charles
 

hj

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How long will the riser be, and how high above the floor? Using your shower drain as a reference for the "P" trap location, it looks like it will be much too low.
 

Charles2000

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The shower drain will only be 12" above the P-trap. The pipe in the picture was just an odd piece I stuck in to show that something goes up.

The floor level is actually at the very top of the final 1/8 bends of the vents. My garage is about 24" lower than the bath floor.
 
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