DIY Home Improvement Forum banner

1 - 20 of 22 Posts

·
Registered
Joined
·
71 Posts
Discussion Starter · #1 · (Edited)
Hey guys, tied in the roughed in plumbing for my basement bathroom addition thanks to some help from you guys and I am just curious if anyone sees any issues with what I ended up doing?

I attached a picture. Vertical pipe in the wall on left side is the vent for the toilet, vertical pipe on right is the vent for the shower, which I tied the lav drain into and turned into a wet vent.

Now for my question, I am in MN which follows UPC and from what I understand a 2" trap arm cannot be longer than 60" from a vent. Well, I measured the shower rough in and it is 7 FEET from the vent in the wall.

This has me worried, but the house was build only one year ago and the city inspector approved the basement plumbing rough in so I can't imagine it would get approved if it wasn't up to code?

Maybe the 2" shower drain connects to a bigger 4" stack under the slab which would allow longer than 60"?

Any ideas on how this would not be against code? And what are the chances the inspector won't approve this because of the work done originally by the builder? I will be mad if I have to tear up the concrete...

Picture attached of the shower rough to the wall...
 

Attachments

·
Registered
Joined
·
3,356 Posts
Personally, I wouldn't worry about it. A 1 1/4" lavatory drain is never going to fill a 2" drain pipe. Therefore the trap will never be siphoned dry.
If inspector fails you, put in an inline vent, take it out when he leaves.
 

·
Premium Member
Joined
·
11,781 Posts
Now for my question, I am in MN which follows UPC and from what I understand a 2" trap arm cannot be longer than 60" from a vent. Well, I measured the shower rough in and it is 7 FEET from the vent in the wall.

This has me worried, but the house was build only one year ago and the city inspector approved the basement plumbing rough in so I can't imagine it would get approved if it wasn't up to code?

Maybe the 2" shower drain connects to a bigger 4" stack under the slab which would allow longer than 60"?

Any ideas on how this would not be against code? And what are the chances the inspector won't approve this because of the work done originally by the builder? I will be mad if I have to tear up the concrete...

Picture attached of the shower rough to the wall...
You are correct on the 60" per UPC. Only your inspector can answer if it will pass or not. In your defense, you continued with top out work on a previously approved ground rough.
Will it drain? yes. Is it per your code? Nope.

However, there is a chance the vent is connected under the slab within 60" and is flat vented back to the wall. We do that when a wall is more than a trap arm's required distance away. It's not a great practice and is not allowed in some areas.
If I were in your shoes, I'd run the water lines and call for inspection- see what his observation is on the shower....
Don't forget to nail plate any spots where the pipes are within 1" of the plate or stud face.
Do you need to pressure test the waste lines?
 

·
Registered
Joined
·
71 Posts
Discussion Starter · #4 · (Edited)
Now for my question, I am in MN which follows UPC and from what I understand a 2" trap arm cannot be longer than 60" from a vent. Well, I measured the shower rough in and it is 7 FEET from the vent in the wall.

This has me worried, but the house was build only one year ago and the city inspector approved the basement plumbing rough in so I can't imagine it would get approved if it wasn't up to code?

Maybe the 2" shower drain connects to a bigger 4" stack under the slab which would allow longer than 60"?

Any ideas on how this would not be against code? And what are the chances the inspector won't approve this because of the work done originally by the builder? I will be mad if I have to tear up the concrete...

Picture attached of the shower rough to the wall...
You are correct on the 60" per UPC. Only your inspector can answer if it will pass or not. In your defense, you continued with top out work on a previously approved ground rough.
Will it drain? yes. Is it per your code? Nope.

However, there is a chance the vent is connected under the slab within 60" and is flat vented back to the wall. We do that when a wall is more than a trap arm's required distance away. It's not a great practice and is not allowed in some areas.
If I were in your shoes, I'd run the water lines and call for inspection- see what his observation is on the shower....
Don't forget to nail plate any spots where the pipes are within 1" of the plate or stud face.
Do you need to pressure test the waste lines?
No I called the inspector the other day and asked what kind of test they require so I could be prepared and he said if I’m just connecting to existing plumbing they don’t do any tests - just visually inspect the new pipe.

My plan was to finish framing/hvac/plumbing/electrical and then call for electrical inspection cause it’s through the state here. Then my local inspector can come out and do the other three at once and approve to seal up the walls. That’s what my inspector said they like to do.

Would you call for just a plumbing specific inspection right away just for this issue? Or would you give the inspector a call? I just don’t want to open a can of worms by bringing it up if he isn’t going to...

I live in a very small town so I’m guessing my inspector will be the same guy that approved the initial rough from the builder since it was just a year or two ago...?
 

·
Registered
Joined
·
71 Posts
Discussion Starter · #5 ·
Personally, I wouldn't worry about it. A 1 1/4" lavatory drain is never going to fill a 2" drain pipe. Therefore the trap will never be siphoned dry.
If inspector fails you, put in an inline vent, take it out when he leaves.
Thanks! That helps me feel a little better about it haha
 

·
Premium Member
Joined
·
11,781 Posts
It's your call on when to schedule inspection, but I'd set my shower, run the water lines and call him in while I'm wiring or doing something else around the project. This would leave a window to make corrections, if any. It would also get this trap arm monkey off your back.

BTW, the lav arm length is max 42" for 1-1/2". Did you exceed that?
 

·
retired framer
Joined
·
44,573 Posts
Metal strap in front of the pipes by the toilet??
 

·
Registered
Joined
·
71 Posts
Discussion Starter · #8 ·
It's your call on when to schedule inspection, but I'd set my shower, run the water lines and call him in while I'm wiring or doing something else around the project. This would leave a window to make corrections, if any. It would also get this trap arm monkey off your back.

BTW, the lav arm length is max 42" for 1-1/2". Did you exceed that?
I don’t think so. It was close because I wanted to get it over as far as I could so it would be centered on a 48” vanity. Here is a picture. Depending where exactly the trap weir is (does the horizontal coming out of the wall count in the measurement?) I think I am within code...

Thoughts?
 

Attachments

·
Premium Member
Joined
·
11,781 Posts
The weir is where the trap outlet turns horizontal

Sent from my SM-G970U using Tapatalk
 
1 - 20 of 22 Posts
Top