Our architect is reluctant to allow any stuffed straw due to fire resistance concerns (the building inspector specifically asked how we would ensure a "machine-equivalent compaction rate"). So, I'm trying to come up with some alternate materials for those odd spaces where modified bales won't work well. The walls are stick framed, and we'd prefer infill materials with firmness for structural reasons. Following are some first thoughts. Any experience with these? I still need to research the properties/costs/availability of these. Any info appreciated. 1) Sheep's wool, treated with boric acid powder (smaller spaces) 2) Homasote board 3) Corkboard 4) Strawboard (core of Agriboard without OSB) 5) Blown cellulose behind plastered mesh Thanks! - Joe Nolan Ithaca, NY