Second floor bathroom plumbing and venting
Asked Jul 23, 2009, 05:02 PM
I have one bathroom in the house on the second floor I am remodeling and have come across some plumbing issues in the process. I am doing the work myself and want to stay in code.
I have a rough plumbing diagram of the house and need help with determining what I need to do.
It is all cast iron pipe for the main drainage and vent stack with some PVC from the sinks and washing machine to main line.
My first issue is the vent stack is rusted out in a spot about 2' long so I need to replace it. It is also the only vent stack in the house and it starts upstairs off the main sewer line draining the tub, toilet and sink in the bathroom as well, there is no additional venting. Is this code? If not what changes must be made?
Also there is no venting for the kitchen sink and washing machine on the first floor. All fixtures have traps. The kitchen sink drains to the 4"main line that runs under basement floor and out to the street. The washing machine has a 2" PVC drain pipe that runs down to the basement and empties into the floor drain. Can I install an A.A.V valve and leave it to drain the way it is or will I have to tie it into the main line somewhere? Also will I have to vent the kitchen sink as well? Can I use an A.A.V valve on it as well?