Sorry if this has been answered before. I have been searching. I was under the impression that in Chicago, they only allowed for pvc in residential use, 3 stories or less, and that copper, galvanized, and cast iron had to be used above grade and only cast iron below grade for non-residential use.
I just came across a post on the web stating that pvc can now be used for ALL drain above and below grade, but cast iron still must be used under ground. Hopefully a licensed plumber can confirm this? Is this a recent code change(when?) and does it in fact apply to commercial properties?
The plumbing union has had strong clout in Chicago and has been against pvc vs other cities, mostly due to the ease of use, less cost, and loss of business, so I am surprised if this is true. I was about to pay a very steep price to replace a very long run of drain cast iron pipes that run above basement ground, so I am praying this is true!