Critique my basement bathroom group

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responsiblejon

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I'm in Indiana, and my 1962 house has a 10'x5' bathroom in the basement. The basement bathroom was plumbed like this and functioned without incident, the toilet gurgled a bit when flushed but that might just be the old stool. I've identified several things on this drawing that I believe to be incorrect.
as is.png



Horizontal use of sanitary T and double combination wye are not correct, and it seems to me that none of the fixtures are properly vented (especially the floor drain turned shower drain), but and have just been sneaking air out of the whatever is available from the 3" DWV from upstairs when its not draining water. Since I've got the floor open and I'm replacing the drains with PVC, I've decided to relocate the shower a bit.

This is my proposed repipe.
v1.png



The major changes include adding a branch line for this basement bathroom group to separate it from the upstairs branch line, and reducing the branch lines to 3" PVC under slab instead of 4" until they meet the main line. I've tried to create a wet vent for the shower and the toilet with the lavatory. Since the shower needs to be on the far side of the main drain, I either have to cross over to connect to the other fixtures in the bathroom, or connect directly to the main line and then create another vent. There is enough drop to have everything sloped 1/4" per foot. Running it this way removes the T cleanout from the main line, but I plan to add a double cleanout on the main line just outside of the bathroom. It would be 6' from where the line exits the house.

Here are my questions

Is it bad practice to have drain pipes cross over other drain pipes like I've done with the shower and main line?

Should I install a dedicated cleanout on the lavatory 2", or is it Ok to just snake from the lavatory sanitary t?

After the lavatory passes the sanitary t, should it remain 2" as a vent or should it reduce to 1-1/2 before it heads to the attic and joins the rest of the vents through the roof?

I would appreciate any feedback,
Thanks!
 

jasperwkingsley

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I'm in Indiana, and my 1962 house has a 10'x5' bathroom in the basement. The basement bathroom was plumbed like this and functioned without incident, the toilet gurgled a bit when flushed but that might just be the old stool. I've identified several things on this drawing that I believe to be incorrect.
View attachment 102494


Horizontal use of sanitary T and double combination wye are not correct, and it seems to me that none of the fixtures are properly vented (especially the floor drain turned shower drain), but and have just been sneaking air out of the whatever is available from the 3" DWV from upstairs when its not draining water. Since I've got the floor open and I'm replacing the drains with PVC, I've decided to relocate the shower a bit.

This is my proposed repipe.
View attachment 102495


The major changes include adding a branch line for this basement bathroom group to separate it from the upstairs branch line, and reducing the branch lines to 3" PVC under slab instead of 4" until they meet the main line. I've tried to create a wet vent for the shower and the toilet with the lavatory. Since the shower needs to be on the far side of the main drain, I either have to cross over to connect to the other fixtures in the bathroom, or connect directly to the main line and then create another vent. There is enough drop to have everything sloped 1/4" per foot. Running it this way removes the T cleanout from the main line, but I plan to add a double cleanout on the main line just outside of the bathroom. It would be 6' from where the line exits the house.

Here are my questions

Is it bad practice to have drain pipes cross over other drain pipes like I've done with the shower and main line?

Should I install a dedicated cleanout on the lavatory 2", or is it Ok to just snake from the lavatory sanitary t?

After the lavatory passes the sanitary t, should it remain 2" as a vent or should it reduce to 1-1/2 before it heads to the attic and joins the rest of the vents through the roof?

I would appreciate any feedback,
Thanks!
Your repipe plan looks good, but here are my thoughts:

Crossover of Pipes: It's generally okay to have drain lines cross if they’re properly sloped and accessible for maintenance (e.g., cleanouts). Avoid it if possible, but it should work as long as you ensure proper drainage and no obstructions.

Lavatory Cleanout: A dedicated cleanout for the lavatory isn't strictly necessary if you have one on the main line. However, it could be helpful for easier access if there’s a turn or trap in the line near the lavatory.

Lavatory Vent: Keep the 2" vent for better airflow. Reducing it to 1-1/2" could work, but it’s not ideal as the 2" vent is recommended for lavatories.
 

tpsmith82

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I would appreciate any feedback,
Thanks!
Hey responsiblejon, while I dont have any expert advise on the layout....I was curious, what program are you using to get those drawings? I've got a total home remodel I'm working on and need to start drawing up some plumbing schematics. I just cant find anything great to do it with.

Thanks!
 

responsiblejon

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Hey responsiblejon, while I dont have any expert advise on the layout....I was curious, what program are you using to get those drawings? I've got a total home remodel I'm working on and need to start drawing up some plumbing schematics. I just cant find anything great to do it with.

Thanks!
Jasper, thanks for the response, my final layout is very similar to as planned here, I’m keeping the 2” vent all the way up.

Tpsmith- this image was created with craftyamigo. https://make.craftyamigo.com/
It has lots of fittings both schedule 40 and dwv, it was easy enough to figure out although I do have some previous experience with programs similar. It’s free to use, and was very helpful as I planned different options.
 

John Gayewski

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The drawing looks good. Crossing pipes fine. Make the the pipe for the shower drain isn't longer than 8'. 2" vent is better.
 

tpsmith82

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Jasper, thanks for the response, my final layout is very similar to as planned here, I’m keeping the 2” vent all the way up.

Tpsmith- this image was created with craftyamigo. https://make.craftyamigo.com/
It has lots of fittings both schedule 40 and dwv, it was easy enough to figure out although I do have some previous experience with programs similar. It’s free to use, and was very helpful as I planned different options.
Amazing, thank you!
 
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