3" Toilet Drain

Users who are viewing this thread

KShirriff

New Member
Messages
14
Reaction score
0
Points
0
Location
Tuscaloosa, Al.
I have a toilet drain on the 2nd floor directly above a 2x6 wall on the 1st floor. Can I run the 3" drain from the toilet flange straight down to the basement without any elbows at the top and tie into the horizontal drain line? I have a 2" vent tied into the 3" pipe about 18" below the toilet flange and vented up throught the roof. Someone said that they think this design might suck the water out of the toilet trap. Is this true?
 

Jadnashua

Retired Defense Industry Engineer xxx
Messages
32,771
Reaction score
1,191
Points
113
Location
New England
That's a really long drop but it won't suck the toilet trap dry with a vent. Not sure if that would meet codes...just don't know.
 

Terry

The Plumbing Wizard
Staff member
Messages
29,946
Reaction score
3,460
Points
113
Location
Bothell, Washington
Website
terrylove.com
It doesn't matter whether it drops straight down or has a few bends.
Hopefully the bowl "does" siphon when you flush. The fill valve refills the bowl after a flush anyway. I would have no problem with a toilet drain run straight down. Wait..........I've done hundreds that way.

dwv_b2.jpg
 
Last edited:

WJcandee

Wise One
Messages
3,182
Reaction score
170
Points
63
Location
New York, NY
I was going to say that you could replace that combo with a Y for the vent, which is effectively what they are saying above.
 
Top
Hey, wait a minute.

This is awkward, but...

It looks like you're using an ad blocker. We get it, but (1) terrylove.com can't live without ads, and (2) ad blockers can cause issues with videos and comments. If you'd like to support the site, please allow ads.

If any particular ad is your REASON for blocking ads, please let us know. We might be able to do something about it. Thanks.
I've Disabled AdBlock    No Thanks