Have a single family home,want to install 1/2 bath on first floor. The stack is 3″, and the toilets will each be less than 6 feet to stack, the 2nd story bath will be dry vent and 1st story will be wet vent. the stack is vertical, The second story is a full bath, and the first story will be 1/2 bath, Any input on this?
It is done, but I would prefer not to, since you would not know for sure if there is a siphon problem on the lower toilet until everything is finished. By then it would be too late to install a relief vent to prevent it from happening.