[l99057j]

I started a remodeling project, adding a new wall and putting a laundry room on one side and turning the half-bath on the other side into a full. Now that I'm 80% done, my wife has decided she would like the bathroom sink on the same wall as the washing machine rather than the opposite side where we originally planned. Of course, this is after I've done the plumbing for the wash. Here is a photo of the wall in question...



Since the image is so fuzzy (I took it with a cell phone) here is a summary. The washing machine drains into a 2" pipe, reducing to 1.5". The 1.5" washing machine drain and a 1.5" utility sink meet up and drain into a 2" pipe.

My question is, what is the easiest way to add a sink just to the right of this photo?

Thanks in advance.

[iamgrowler]

Well, you've already screwed it up by using a double San-Tee as a drainage fitting, reducing the size of the clotheswasher standpipe and trap arm and by using a medium sweep 90 to transition from vertical to horizontal.

[l99057j]

Well, you've already screwed it up by using a double San-Tee as a drainage fitting, reducing the size of the clotheswasher standpipe and trap arm and by using a medium sweep 90 to transition from vertical to horizontal.

I appreciate that you took the time to look and respond, but would it have hurt to post something constructive? You pointed out what was wrong, but didn't offer any constructive advice on how it should have been done. What layout would you suggest? I will gladly tear it out and re-do it properly. I obviously wouldn't be posting a question here if I weren't willing to hear from and take the advice of those more experienced.

[iamgrowler]

Is the lavatory going to be back to back to the laundry sink?

[l99057j]

Is the lavatory going to be back to back to the laundry sink?

No, from left to right (from the camera's viewpoint in the photo)...

Utility sink (other side of wall)
Washing machine (other side of wall)
Lavatory sink (this side of wall, in the stud bay just off the right side of the pic)

Thanks.

[iamgrowler]

You want to do something like this:

But replace the fitting marked with an arrow with the fitting in the second picture.

[l99057j]

Thanks for the input, growler, I'm going to give this another try. I would like to ask a question, though, because I want to learn about this instead of just doing it and not understanding why. Here is a snippet I copied from another site...

A sanitary tee directs traffic in your home's drain-waste-vent plumbing system to make sure wastes go down to the sewer and gasses go out the vent stack. Like other types of T fittings, it connects two pipes in line for a main run and one at a 90-degree angle for a branch run. But it's a little different than a standard tee: it's designed so waste will flow through it smoothly--the branch run curves toward the perpendicular main run (a similar tee with a long, sweeping curve is called a combination tee).

Why was it wrong to use a double sanitary-tee in this case? When, if ever, would you recommend using one?

[iamgrowler]

Thanks for the input, growler, I'm going to give this another try. I would like to ask a question, though, because I want to learn about this instead of just doing it and not understanding why. Here is a snippet I copied from another site...



Why was it wrong to use a double sanitary-tee in this case? When, if ever, would you recommend using one?

A double sanitary tee is a vent fitting for tying two horizontal vents into a vertical vent.

If you look at the venturi inlets of a double Sanitary Tee, you'll see that they match the profile of a medium sweep 90.

Then look at the Partition Cross photo I uploaded and you'll notice that both inlets match the profile of a long sweep 90.

The Partition Cross does a much better job of directing the flow down the drain, while the double ST, particularly when using it for a pumped discharge drainage fitting has the potential to shoot past the drain and into the trap arm of the other fixture.