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BobOB1775 05-02-2013 07:08 PM

Converting Bath to Shower
My wife wants to remove an outdated jetted tub on the second floor of our home and replace it with a shower. My understanding is that I need a 2" drain. The existing bath tub has a 1 1/2" drain. Can I leave the 1 1/2" vent pipe when I replace the drain pipe with a 2" pipe or will I need to make the vent pipe to through the roof 2" also?

oh'mike 05-02-2013 07:57 PM

You will be fine with a 1 1/2" vent----that will work well and meet code---

ddawg16 05-02-2013 08:07 PM

Mike is right....1 1/2" vent is fine.....assuming you don't have a bunch of other stuff on it....there is a formula for calculating it....

Just a little I understand it....a bathtub can drain have a tub holding the water.....but on a shower, there is no 'tub' to hold the water....hence, it needs to drain out as quick as possible....hence, the 2" drain....

oh'mike 05-02-2013 08:10 PM

Yikes---1 1/2 VENT is fine---drain must be 2"----

ddawg16 05-02-2013 08:12 PM


Originally Posted by oh'mike (Post 1171485)
Yikes---1 1/2 VENT is fine---drain must be 2"----

Thanks Mike.....vent, drain.....what ever it takes.....long day....

Fix'n it 05-02-2013 09:09 PM

i have a 1 1/2" drain in my shower. NO issues what so ever.

oh'mike 05-03-2013 06:19 AM

Times change and codes change----2" is code --and hair and crud cause enough slow 2" drains that choosing 1 1/2" when remodeling is just a poor choice.

Fix'n it 05-04-2013 07:54 AM

yeah. there was 1 1/2" in there already. so when i replaced it, i just went with the same size. when i redo the bathroom, i will code it all.

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