I thought cellulose wasn't recommended for exterior walls b/c moisture retention. aren't most batts for 2x4 walls rated r-13? I just saw rockwool batts at the store, which I thought was banned or no longer in use. They touted r-15 for 2x4 and claimed "superior fire protection". All I know is blown in rockwool is some of the worst stuff to work in and disturb in an attic.
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