Thanks for this forum! Lots of great advice. Hoping you can help with some questions about a new bathroom. We converted an old playroom (24x24) in to a new downstairs master and bathroom. We completed the bedroom, closets, and everything except the bathroom before the pandemic hit. Not finally getting to the bathroom. Attaching a couple diagrams to help convey what I'm dealing with. Essentially I'm trying to devise a solution to wet vent and use air admittance valve(s) to adequately vent this bathroom. Hard part is most of the walls are finished except the 3 walls around where the shower is planned and they are open on the inside. Attic above entire area and crawlspace below. I think I can get a 2" vent up through the roof for the toilet however the bathtub, sink and shower will all be upstream of the toilet.
The order would be starting with the tub, then sink, then shower then toilet, and then tying in to an existing 2" drain line that I'll be replacing with 3". Out kitchen sink and washing machine are the only other fixtures further downstream on the existing 2" drain. Starting with the tub and sink I was thinking to go with 2"pipe. So tub with 1.5" trap then going in to 2" and same for sink. Continuing 2" through the shower and then increasing to 3" when getting to the toilet. Question is location(s) and quantity of AAV required? I'm thinking one under sink might be sufficient with increased pipe size. Would I also need one in crawlspace at the tub trap? Since most of the walls are closed no way I could properly vent all to atmosphere.
There is an existing AAV in the crawlspace between kitchen sink and washing machine. After this bathroom is complete I'll also be moving the washing machine to a different location on a different line.
Any of your expert opinions and advice much appreciated! Feel free to ask any questions as I'm sure there is important info I've missed. I've spent many hours on this forum determining where I will need wye's vs sanitary tees etc. etc. Thanks!!!!
p.s. - sorry for the horrendous drawing ability and handwriting... ; )
The order would be starting with the tub, then sink, then shower then toilet, and then tying in to an existing 2" drain line that I'll be replacing with 3". Out kitchen sink and washing machine are the only other fixtures further downstream on the existing 2" drain. Starting with the tub and sink I was thinking to go with 2"pipe. So tub with 1.5" trap then going in to 2" and same for sink. Continuing 2" through the shower and then increasing to 3" when getting to the toilet. Question is location(s) and quantity of AAV required? I'm thinking one under sink might be sufficient with increased pipe size. Would I also need one in crawlspace at the tub trap? Since most of the walls are closed no way I could properly vent all to atmosphere.
There is an existing AAV in the crawlspace between kitchen sink and washing machine. After this bathroom is complete I'll also be moving the washing machine to a different location on a different line.
Any of your expert opinions and advice much appreciated! Feel free to ask any questions as I'm sure there is important info I've missed. I've spent many hours on this forum determining where I will need wye's vs sanitary tees etc. etc. Thanks!!!!
p.s. - sorry for the horrendous drawing ability and handwriting... ; )