help with a shop bathroom
I built a 40X60 steel building and framed a small bathroom inside. I framed it 7ft. tall with a platform above for storage. The buiding itself has 14ft. sidewalls I have everything in place, (toilet, sink, shower). The drains go to a private septic system underground. Also, I have no code requirements out where I am building. My question is:
Can I use an air admittance valve for the whole bathroom instead of a vent pipe through the roof, so I don't have to go through the metal roof? A local plumber I know says that it is fine, but not sure I am completely convinced. I would really like to get away from going through the roof. Thanks for the advice in advance.