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Old 11-08-2011, 09:08 AM   #1
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does my PVC rough-in have a trap?


I am wanting to install a floor drain in my utility room that came with rough-ins for a full bathroom. I installed a commode and sink 15 years ago and now want to use what I think is a shower or tub drain rough-in as a floor drain. But how to tell for sure if there is a trap already there?

I have some ideas like pouring in some water to fill the trap (if any) then shining a light to see if there is a water surface. Maybe blowing on the pipe to see if the water gurgles. Any other ideas or standard techniques?

BTW, the rough-in in question is 1.5" PVC (currently capped) in a slab-on-grade foundation, located about 19" from the wall. Should be for a shower or tub, no?

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Old 11-08-2011, 09:18 AM   #2
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does my PVC rough-in have a trap?


Most likely that's a tub drain---It should have a boxed opening around the pipe to allow for the tub drain to clear the floor.

Post a picture if you can--or let us know if there is a 12x12 opening boxed into the floor.

Shower drain pipe is 2"---adding water to the pipe and checking what's in there with a stick is about all you need to see if there is a P-trap

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Old 11-08-2011, 09:34 AM   #3
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does my PVC rough-in have a trap?


Nothing really to see. It's just a 1 1/2" PVC pipe sticking up out of solid concrete about 19" from the wall, off by itself away from the commode and other drain rough-in. No boxed opening. I cut it off flush and plugged it so it wouldn't be a tripping hazard. I wondered about the small size for a shower or tub, too. The other drain rough-in was 2" but it was located a few inches from the wall like a typical sink drain. That is what I used for my utility sink. This smaller one seems to be located where one might put a shower or tub but it is only 1 1/2". Curious....

I can try the stick thing but how far down would a trap be? At some point the stick would bottom out in an elbow or perhaps in the main drain line that goes out of the house?
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Old 11-08-2011, 09:42 AM   #4
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does my PVC rough-in have a trap?


Tub drains are only required to be 1-1/2". Shower-only drains must be 2".
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Old 11-08-2011, 09:53 AM   #5
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does my PVC rough-in have a trap?


Assuming it is a tub drain, would it typically have a trap pre-installed down in the slab?
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Old 11-08-2011, 09:54 AM   #6
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does my PVC rough-in have a trap?


That 2" you used for the utility sink was ,likely, a vent for the toilet----

A picture or diagram would help---the 1 1/2" pipe could be a trapped drain for the tub or the drain for a sink.
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Old 11-08-2011, 10:27 AM   #7
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does my PVC rough-in have a trap?


Here's a drawing....
Attached Files
File Type: doc UtilRoom.doc (96.5 KB, 62 views)
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Old 11-08-2011, 04:28 PM   #8
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does my PVC rough-in have a trap?


Sorry,I couldn't down load the picture
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Old 11-08-2011, 05:44 PM   #9
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does my PVC rough-in have a trap?


Hmm, it was just a MS Word doc. Anyway, here is a linked jpeg version.

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Old 11-08-2011, 06:07 PM   #10
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does my PVC rough-in have a trap?


Thanks---Any idea where the vents are? Should be a 2" vent riser near the toilet----possibly one more near the tub hole.
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Old 11-13-2011, 10:58 AM   #11
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does my PVC rough-in have a trap?


Near as I can tell the pipe is trapped. I just did a water heater replacement and drained the old one into this pipe. When I look down it now there is an elbow down a couple/few feet with a solid clean water surface. No odor of sewer gas whatsoever. On a recommendation from a friend I blew into the pipe and it gurgles and bubbles and the water surface does not change.

Friend also mentioned something about a term called "arm" or the distance from the connection to the main drain line and that vents might not be required. All these connections seem to be very near where the main line has to cross the slab and then exit the front of the house. In any case the sink and commode have worked fine for years.

I am going to install a floor drain on the 1 1/2" in question.

Also, a correction on my drawing above... the 2" where the utility sink is connected is really 1 1/2" and the 2 vertical main drain pipes are 3", not 4".


Last edited by raylo32; 11-13-2011 at 11:04 AM.
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