Bathtub to Shower Venting On Slab

Users who are viewing this thread

Alecstar

New Member
Messages
17
Reaction score
1
Points
3
Location
South Carolina
IMG_2446A.JPG
Hello and thanks in advance to anybody who responds. My home is 5 years old and on a slab. I removed the whole acrylic tub and walls unit and am putting in acrylic shower pan with tile. I have seen enough Holmes HGTV to know that there has to be air behind water. I removed everything and what you see left is the bath-tub drain along with the tub overflow drain. They both connect to an elbow that connects to a pipe that goes straight down (13"} into the plastic lined hole you see in the picture. Beneath that I have no idea. I always thought plumbing had to have a trap and a vent. Could it be that the tub overflow is serving as the "air vent"??? Also where is the trap? I don't want to go any further with this until I know what to do. Are new slab homes built differently in this regard. I have to break some concrete up to move the drain slightly as well as lower it. Any suggestions are greatly appreciated. Thank you
 

Jeff H Young

In the Trades
Messages
9,233
Reaction score
2,321
Points
113
Location
92346
the verticle pipe coming up through slab is typicaly 99.9 percent of time connected to a p trap. It very well could be properly vented , you never know but if you dont know what your looking at I wouldnt assume its wrong. Lastly an overflow is in no way a vent forget that Idea
 

wwhitney

In the Trades
Messages
6,603
Reaction score
1,859
Points
113
Location
Berkeley, CA
At the bottom of the hole, remove the soil between the vertical pipe and the little bit of horizontal pipe you can see that is not immediately adjacent to the vertical. I bet you will find that soil was covering the u-bend of a p-trap.

Cheers, Wayne
 

Alecstar

New Member
Messages
17
Reaction score
1
Points
3
Location
South Carolina
Okay, so the trap is below what you see in the picture. What about the vent??? If in fact the builder used the tub overflow pipe as an air vent (technically that would work I suppose) is that legal by plumbing standards? Thank you for your responses.
 

Jeff H Young

In the Trades
Messages
9,233
Reaction score
2,321
Points
113
Location
92346
The "Trap arm " goes toward the vent bust floor out follow that pipe to find the vent . but id open floor cut old trap off and run horizontal pipe to where new drain will be. note: do not offset the horizontal trap arm up higher. also note there is no cookie cutter answer to your questions with no sketch or photos of where other pipes are . NO A OVERFLOW IS NOT A VENT it was not put there as a vent its called an overflow and is only an overflow. You keep thinking your house is plumbed wrong but I see nothing to indicate that
 

Alecstar

New Member
Messages
17
Reaction score
1
Points
3
Location
South Carolina
The "Trap arm " goes toward the vent bust floor out follow that pipe to find the vent . but id open floor cut old trap off and run horizontal pipe to where new drain will be. note: do not offset the horizontal trap arm up higher. also note there is no cookie cutter answer to your questions with no sketch or photos of where other pipes are . NO A OVERFLOW IS NOT A VENT it was not put there as a vent its called an overflow and is only an overflow. You keep thinking your house is plumbed wrong but I see nothing to indicate that
Guess what? That overflow arm was used as a vent. Now that the tub/overflow is gone and there is just a shower pan... it makes noise when draining. Since its on a slab there is no way I can see to fix it without doing a whole lot of damage first. At least it drains... even if its noisy.
 

Jeff H Young

In the Trades
Messages
9,233
Reaction score
2,321
Points
113
Location
92346
pipes will allways drain if it has fall and isnt plugged. un vented is what I call what you desribe so if you demoed all the walls and coudnt find a pipe in the slab for a lav or anything withen around 5 or 6 feet then you are right its unvented
 
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