washer tray indirect waste

[abteknik]

Hi.

Opinions please:

I'm installing a washing machine on the third floor above my second-floor bathroom. It needs a tray underneath it in case of overflows; that tray must drain; if it's a direct waste it needs a trap; if the trap is used seldom-or-never it needs a primer; primers are expensive and unreliable. At least that's my understanding.

To get around this, I decided to plumb the tray as an INDIRECT waste into the overflow tube of the bathtub directly below it, cutting in an 1-1/2 deSanco wye and running a standpipe inside the bathroom wall. But as I think of it, why can't I plumb the regular washer waste into that same line too, also as an indirect, and avoid cutting a new vent through the roof? The Uniform Plumbing Code permits indirect wastes from washers....

Kosher? Or no?

Thanks.

Ace

[Terry]

Drain for a washer
The purpose of a trap, is to prevent sewer gas and smells from entering the home.

Unless you like things that smell, then you would want to to it right.

The washer should have a 2" standpipe, trap and waste line.
The trap should be vented with a 1.5" vent.
The trap should be between 6" and 18" above the floor that the washer sets on.
Standpipes from the trap should not be less than 18" and not more than 30".

Without the vent, the trap siphons and you have the smell.
Most of the time, you would revent to the tub vent, or go through the roof separately.

If you drop the washer into the w&o of the tub below, since it is coming from farther up, it will of course siphon that trap, and you will have the smell there.

OK, now the washer pan drain.
If the washer pan uses something like a 1", then that could be plumbed.
The UPC does allow for condensate waste from an "air conditioner" to the tub overflow, however, you are talking about very little water dripping down the line.

[master plumber mark]

why does the drain for the washeing maching pan
need to be connected to anything at all???

its there mostly for emergency only,
in case of a catrosphoic flood..correct??


if you can plumb that 1 inch pvc pipe down to the
basement and or sump pump pit ----
or crawl space just simply dead end
it there and totally forget about tieing it into the drain system..
trap and all.

I have also seen people just plumb the pipe literally
out the side of the house and turn it downwards like a condensaton drain....
flowing into the gutters of just spilling down to the lawn below...

they did install a screen over the end of it to keep
critters from nesting in it but it seems to work fine for
the job its intended to do

its probably never ever going to have water pasing through it
in the first place , and if it does , its only a tempeorary
emergency situatioin...

so whats the difference??

[abteknik]

Thanks Terry. There's just no getting around that eight-foot fall to the tub trap, is there? Air break, six or eight feet of lateral, it's still an eight-foot fall in a 1½ pipe....

Thanks Mark. I like your style. The suds on the lawn, I like. But you're right: it'll never get used. Still, I think I'll run it to the tub overflow, I guess just because I can.

Ace