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The section which use to include the limitations on combustible DWV now includes language which says it must be installed to conform with Chapter 15 which is "Firestop Protection". I believe with all of the new firestopping materials they have decided plastic is acceptable. Still I'm sure many municipalities with add it back in on their amendments based on the fact the firestopping may still be installed wrong and not protect the structure.
"Somewhere a Village is Missing Twelve Idiots!" - Casey Anthony