Submitted by FirstForFun44 t3_10w9hqq in DIY
Hello all, I'm installing a shower drain that has two drains in a 9ft long shower. Originally, there was a drain on one side of the shower that also connected to the toilet outflow and both were connected to a 3" vent stack to the roof and the master drain pipe. My new drain has two drains and I'm installing dual showerheads and I'm not sure what the vent stack requirements are. Here's a pic of what I've plumbed so far https://imgur.com/a/RW7Sd6n. The vent stack is in the same location, which then connects to the toilet and then into a hub that connects to the shower. This hub used to have three connections, but I've installed the fourth for the extra drain. The shower drains are 2" pipe which then expand to 3" including the vent stack. I'm not really sure I need to run a vent stack connecting the shower drains to the vent stack in the wall. My assumption would be that I don't, but I want to be sure and the research I've done online doesn't explain it well. All pipes have at least a 2% grade leading down to the master hub. I appreciate any insight from someone who knows better than I. Cheers.