Looking for some advice on venting a shower. In photo "IMG00009.jpg" you will see the horizontal drain line. The right vertical line is the vent stack. The left vertical is the drain for the sink. Is the shower already vented according to plumbing code or do I need to attach a vent closer to the shower drain?
In photo "IMG00007.jpg" you will see the sink venting. The towel is plugging a "T-fitting" that I was thinking of using for the shower vent if I needed it.
Also, what is the standard thickness I need for the sub-floor of the shower pan and the rest of the shower? Is 3/4" plywood enough? I will put mud down on top of that.
Thanks for your help.