Daddy-0-
Moderator
New construction house has an attached garage with finished space above. The first floor 1/2 bath rear wall backs up to the garage common wall. Customer wanted a pedestal sink but it needed an AAV for the plumbing vent. They installed the AAV high in the wall and put in the plastic grill on the GARAGE side of the wall. It is not a penetration per se because it only penetrates the garage side drywall not the bathroom side. I have issues with the fact that the AAV will draw gas fumes and CO2 and whatever else into the building envelope even though theoretically the plumbing system is a closed loop. I am also concerned with the fact that a fire in the garage would melt the exposed PVC pipe and get into the wall. Can I enforce this. Need a code section. Thanks