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Old 01-02-2010, 01:16 PM   #1
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Question - Tub Drain Size

I am planning out my bathroom remodel - trying to make a materials list.

My current 20 year old cast Iron tub is connected to the stack with a 1.5 inch ABS pipe. I will need to replace this obviously and read somewhere that new codes require 2 inch drains on tubs.

In looking at the tub shoe sets at HD and Rona I only saw 1.5 inch sets.

Can someone explain what the standard size is now and whether I need to connect the 1.5 inch tub show to a 2 inch ABS darin pipe.

I believe I will need to install a new Y in the 4 inch stack so I want to make sure I have thought this through before it comes down to "crunch time"

Thanks in advance.


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Old 01-02-2010, 01:48 PM   #2
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I'm not a licensed plumber, just a long-time DIYer, but I believe that 1.5" is fine for a tub, but you need 2" for a shower. Check with your Building Inspection Department for local code.
Good luck!


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Old 01-07-2010, 01:11 PM   #3
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i am a lic. plumber and this is true
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