If you are not installing a wall over the foam, what if any product should you use for fire protection?
The article ignores the significant sonic benefits of fiberglass and points out that c-lose fails under leak conditions. I have used it for decades and the leak conditions have never arose (don't put plumbing in exterior walls) and if you have a roof leak, insulation behvior in the vast majority of such situations is a very minor factor. Given all this I vote for cellulose insulation.
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