Toilet drain line size - InspectionNews

Jon mackay · #1 (**permalink**) 07-30-2010, 09:36 AM

Is there a minimum size for a toilet waste line?

I came across a 3" cast iron line from a toilet and it just didn't look right.

H.G. Watson, Sr. · #2 (**permalink**) 07-30-2010, 10:12 AM

Why don't you go ahead and access the New York State Residential Codes?

brian schmitt · #3 (**permalink**) 07-30-2010, 10:30 AM

3" is the minimum size for A toilet.

Jon mackay · #4 (**permalink**) 07-31-2010, 05:53 AM

Quote:

Originally Posted by H.G. Watson, Sr.

Why don't you go ahead and access the New York State Residential Codes?

Is there a link to that?

Jon mackay · #5 (**permalink**) 07-31-2010, 05:53 AM

This was a small commercial office that has a history of the toilet backing up. When I saw the 3" I just thought I would throw it to the forum as all the residential toilet lines I find are 4".

Ron Hasil · #6 (**permalink**) 07-31-2010, 10:29 AM

THe Picture is from the New York State Code. Look at the foot note (a.) it states the minimum size of any buidling drain serving a water closet shall be 3" Here is a link to the state plumbing code 2006 New York State Plumbing Code