The old college try
Engineering Technician
I have an existing full bathroom that I'm remodeling. Currently the fixture drains tie in near the top end of the 4" horizontal building drain with the WC at the top, then the sink, and finally the tub. A 4" vertical vent exists at the top end of the horizontal drain placing the tub drain about 5-6 feet from the vent. The fixtures are not currently revented into the vertical stack. I plan on rearranging the fixtures and as such, the sink will tie in near the top of the horizontal drain, then the tub and then the WC will tie in about 6 feet from the vertical vent. Can all of the drains tie into the horizontal drain without additional venting, or do they require vents that tie back into the vertical vent upstream? If they require additional venting, will AAV(s) suffice?