Looks like good stuff, maeve. I dislike the "fungi resistance,... and pest resistance" part but if you can ensure against water damage and pests, it could be used in int/ext walls. How's the price against fibreglass (still my top choice).

Just one precaution with the cotton. It will attract insects and insects are pretty darn hard to keep out. I wonder what they treat it with so that insects won't eat it???