Hi -- I'm on the board of a condo association (a 6 flat in Chicago). The building was built in 2012 and we are experiencing extensive sewer issues -- we were told that the pipes installed in 2012 to connect our building to the city's main line were "clay" pipes, they are now replacing a long stretch with cast iron pipes. It seems crazy that the pipes have deteriorated in this short time (one of the pipes has collapsed). Does anyone know if clay pipes are "up to code" in Chicago? Thank you!