Plumber's Preference?

Is it out of the ordinary to install the cleanout, above the santee for my washing machine outlet box setup? I figure since the trap/trap-arm/stand-pipe are in the wall, and the trap cannot be taken apart it would make more sense...

Is it also out of the ordinary or a bad idea to use a 2" trap on my tub/shower, the line is obviously 2" and trap isn't set, I realize drain/overflows are 1.5"?

Installing a C/O on a washing machine stack is a good idea; installing it above the wash box is not. One day someone will have to cable that line, and having a C/O high up off the floor is a safety risk for the operator of any drum machine. Also, C/O plugs are ugly, and most people want them hidden away.

The restriction for a tub happens at the fixture outlet piping, and especially at the tub strainer if an integrated popup is used. Using a 2" line won't offer any real benefit other than the fact that a clog is somewhat less likely to form. But then on the other hand, using a larger pipe "could" make it harder to cable the line when it finally becomes necessary to clear a blockage if you are using a smaller cable.

However, if you've already roughed-in a 2" line, you may as well put in a 2" p-trap.

I said C/O above the santee, not the wash box though... On my lav I would install it below the trap arm, in this case I wanted to install it just above, it would only be higher by the height of the 2x2x2 santee...

We are REQUIRED to have a cleanout in the riser, and it can be above or below the sanitary tee, ( and how high above the sanitary tee is a personal preference, there is no "standard" height. For example, behind a toilet the cleanout is often installed higher than the toilet's tank which is about 3' above the floor). I prefer to rotate it to the other side of the wall so I do not have to pull the washer or dryer to get to it. I ALWAYS use a 2" trap for a bathtub and reduce at the point where the tub drain connects to it. A snake will go around a 2" trap a lot easier than through a 1 1/2" one.

I've generally installed the clean outs above the san tee's as well but I'm not sure if that is the best solution or not.
I know that I have made more than my fair share of mistakes.

For example in the last project I put the clean out for the main stack in the adjoining closet rather than in the bathroom on the side wall next to the toilet.
Oh well at least I made an effort.
Michael

Thank you hj, unfortunately I wont be able to turn this clean out because it's going to be inside a wall between my neighbor and I, I see where you're coming from though, it's nicer not having to crawl under a sink to get at them either...