Is there a max slope for shower drain?

[Caduceus]

If you have a 3x2 wye and a 45 in the wye for the 2" branch you have s-trapped the fixture, unless you have a vent installed between the trap and the stack. The inspector may have a problem with that. Flush's diagram shows a 3"x2" tee for the stack to act as the vent as long as no other waste or soil enters the same stack from an upper floor.

[FlushMasta]

thanks Cad and Phish for your responses... Caduceues, you made a very important comment about 'fudging' joints, which skipped my mind but shouldn't go unnoticed.
Mark, i think you may have over looked the point of my diagram... the answer to your question "Is there a max slope for shower drain?..." sometimes, specially when you're asking an inspector

Originally Posted by markcool

Alternately, can I add a vertical 2" vent inside the wall, go straight from the trap to the vent, then drop to the drain?

I would have to run the 2" vent inside the wall to tie it into the 3" stack..

this is probably your best bet if you're connecting to a Y fitting... i've attached another diagram which i hope is similar to your idea... the 'grey' part could be a studor vent or air admitance valve (which would need an access panel or similar)... or in black, a san-tee connecting to the exsisting vent

[markcool]

Guess I answered my own question.

The venting is tricky.

[markcool]

Oops,

I didn't see the page 2.

Thanks for the add'l responses, and the diagram Flushmasta.

That's what I was thinking, is to put a 2" vertical vent in, then drop to the wye after that. I can put the vent in the shower wall, about 22" from the trap.

I won't be able to studor, because of the tile. I could run it all the way to the roof, and tie it into the main vent in the rafter bay.

Thanks again, I appreciate you guys taking the time out to help.

[phishfood]

Sounds like you are actually going to do this right, kudos to you!

[markcool]

It's a lot easier when I ask for help.

thanks again!

Mark