Re: 3" or 4" toilet dwv - is one better than the other.
Posted by Steve on February 15, 19101 at 12:25:48:
In response to Re: 3" or 4" toilet dwv - is one better than the other.
: We're renovating our bathroom and installing a new half bath. In the new half bath we plan to use the 3 gallon toilet from our old bathroom. My question is it better to install a new 4" branch drain or should we go with a 3 inch? Is there any benefit to installing a 4 inch?

Eh..I am a novice too. If it were up to me , I would put in a drain that was as large as possible, seems like there would be less chance of obstructions. However I would not put in a 4"waste line that feeds into a 3" main line, would seem like there could be a back flow issue. If I am wrong, I am sure we will hear about it ;)


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