Hello all,


Let me start with, I'm coming here because it is incorrect, help with correcting it would be great so thanks in advance!


The following is for only the drain side of the system


The setup, a 1-1/2 fernco fitting stubbing out of the floor, 30" from the back wall, this drains down to the main sewer id say within a few feet to an unknown diameter, assuming 3" within about 3-5'


Previously, 10" pvc vertical, 90deg to an 18" trap arm and P-trap connected to a wash basin/sink. (The old 90's washer would all but fill this sink up with its 80Gal capacity (exaggeration) with it slowly draining over the next few minutes) no DWV stack in any kind of proximity as far as I can see.


The attempt, a sink and a washing machine wall box;


A few things, let me start with saying I'm sure the overwhelming answer is going to be, based off the draining setup from before with the wash basin brimming, the 1-1/2 floor drain is not close enough to the main / not getting enough air movement to accept the influx of water. That moves us to either jack hammer the floor, a trash/waste pump, or using the old method of “I hope the sink doesn’t overflow”


Currently we have setup, starting at the furnco from the floor, 6” vertical 1-1/2 to a sweep 90 taking it horizontal towards the back wall, a studor vent off a T, then a 9” horizontal piece to a 90 back to vertical, a sanitary T, off the side opening a 10” run to a P trap(open to the vertical), a 5” stub to a reducer from 1-1/2 to 2” this goes 24” up to the washer box, the vertical opening back on the sanitary turns a 90deg to a 10” horizontal run, 90deg on horizontal, to the opening where the p trap will eventually attach protruding through the wall.


What should be done differently in this setup? Is there a fix or am I doomed?

Look, you made it all the way to the end of that! On a serious note, thanks for the read, hopeful for an answer!

Currently we have setup, starting at the furnco from the floor, 6” vertical 1-1/2 to a sweep 90 taking it horizontal towards the back wall, a studor vent off a T, then a 9” horizontal piece to a 90 back to vertical, a sanitary T, off the side opening a 10” run to a P trap(open to the vertical), a 5” stub to a reducer from 1-1/2 to 2” this goes 24” up to the washer box, the vertical opening back on the sanitary turns a 90deg to a 10” horizontal run, 90deg on horizontal, to the opening where the p trap will eventually attach protruding through the wall.

HUH? My head hurts just reading this! With all the turns, fittings, traps and piping, you violate one of cardinal rules of drains: Straight and simple. I believe you would have water all over the floor from trying to force a fast flow through this piping setup. Remember your comment about filling the sink and it draining? Now think about forcing all this through what you are considering. I can't even draw this out. Get a bigger laundry sink and go with that.

Can you post a drawing of your present set up - or at least few clear pictures ? I find it hard to follow your description

Back to you

Milo

Image - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting

This was the setup, we have since removed the entire apparatus as we tried the kiss method (keep it simple stupid) and tried to just see if the floor drain from the fernco could handle the inrush of water, it couldn't. So no matter how simple or difficult the plumbing above the floor, it was going to back up immensely.

We added a new cabinet with a giant sink basin, fernco comes up to a sweep, p trap, riser to the sink basin. Simple and clean.

The washer box wasn't completely abandoned as it houses the supply. I am curious though, in the interest of science, code, and better plumbing everywhere, what would have been the appropriate solution, given the text above and the (hopefully uploaded) picture.

Thanks again all

The drain for washer should be 2" with 30" tall stand pipe, and 2" trap... New washers pump out high volume of water in short period of time so 2" drain is a must. Also, if you want water to drain faster, you should vent that drain as well

Since the existing drain is 1 1/2", and it is set in concrete slab, you don't really have too many options. Installing service sink, and having washer draining into it, is probably the best solution for this situation

Milo