Chad Curtis
New Member
I have an issue on new construction in the shower. The shower was not vented because it's within 6 ft of a vent in the exit drain system. I believe the drain pipe has too much fall and is drawing the water out of the P trap and allowing sewer gas into the shower space. Soap suds tends to amplify the sewer gas into the shower bay. The trap eventually fills back up and the gas is not persistent. I've inserted multiple brands of those flow slowing devices to reduce the flow of water to the P trap, but the siphoning is still happening. Is there some some sort of insert you can install past the P trap in the drain to break the siphon before it draws the water from the P trap? The piping is in a slab and I don't want to break the concrete to add a vent to the shower if possible.