washer and shower drain

[timberbrained]

Hello all. First time doing some drain plumbing and I have few questions regarding the fittings and vents needed. I have a shower 2 inch going into a vertical not under a wall(only travelling about 18 inches) , but also a washer drain joining at the same fitting(also only travelling 18 inches). the washer , i can vent up within the wall but does the shower still need to have its own vent? I had drawn this with a double santee fitting. is this the right fitting? It is a 2 x 10 joist cavity and I don't know if it is enough space to vent up from santee and elbow over to connect to the washer vent in that wall. Also, does that vent need 2 inches or reduce to 1.5 is o.k. How does one vent a shower usually if it does not drain under a int. wall? Cannot lower the ceiling below at all.
thank you for any insights you have to share
JD

 

[Jeff H Young]

1 1/2 vent not really catching on to your problem or question or exact situation. but perhaps if the 2 inch line is coming up a wall you can add a wye and 1/8th bend in upright fasion and come through the plates with 2 2 inch lines ?

 

[Sponsor]

 

[timberbrained]

Thanks for the reply Jeff. I know it is hard to write about the situation. the washer and shower drains meet(Double santee?) under the shower pan that has a interior wall below it, which will have the 2 inch vertical drain into cellar. this wall is not directly under the wall that the washer is in. The washer drain is in a wall adjacent to the shower, which is why I can put a vent there. In this case there is no vent for the shower except this wet vent of the washer drain. Do I need a vent coming off the shower trap arm or up out the top of the double santee, or is the washer vent enough for both of these. I imagine if someone is showering and washing clothes at the same time, there could be a problem. Thanks
JD

 

[Jeff H Young]

i think there is a easy way to build this just not sure what you have

 

[opplumbinghub]

The shower needs its own vent to prevent drainage issues, even if it’s not under an interior wall. You can use a double sanitary tee to connect the shower and washer drains. If space is tight in your 2x10 joist cavity, consider using a vertical wet vent (if local code allows) or running a horizontal vent from the shower to the washer vent in the wall. The vent pipe can often be reduced from 2 inches to 1.5 inches, but check your local codes. Make sure the vent slopes upward to ensure proper airflow. If you're unsure, consult a professional plumber.

 

[Jeff H Young]

The shower needs its own vent to prevent drainage issues, even if it’s not under an interior wall. You can use a double sanitary tee to connect the shower and washer drains. If space is tight in your 2x10 joist cavity, consider using a vertical wet vent (if local code allows) or running a horizontal vent from the shower to the washer vent in the wall. The vent pipe can often be reduced from 2 inches to 1.5 inches, but check your local codes. Make sure the vent slopes upward to ensure proper airflow. If you're unsure, consult a professional plumber.

code dosent allow a horrizontal dry vent below the floor so forget that idea . verticle wet venting ? if he cant vent out the shower how could he stack tees and be low enough to get over to the wall befor going verticle.
Of cource he is unsure thats why the question asking us ? are you AI ? or live .
That explains Why Im stumped and probebly why further comments havent apeared .
Timberbrained needs photos and hopefully drawings but as it is I cant tell him how to plumb it he might help by adressing his plumbing code to us Im assuming IPC

 

[timberbrained]

No I am not AI. I am a real dude trying to plumb his own house ,because I cant seem to get a pro in here to do it. They don't return my calls for whatever reason or are too busy to take on this job. I will try to take pictures and post it.once I get some materials together. I was thinking that the washer(with an in-wall dry 1.5 inch vent ) draining into the double santee would serve as a wet vent for the shower. I did not know you can't have a horizontal dry vent in the floor?? I thought that was going to be difficult to squeeze in the joist space anyhow. It seems to me the washer wet vent would be the only option, but I wondered if that would function well, if the washer was used when shower is in use simultaneously. Thanks for your help
JD