Most of the familiar insulation products are under mild to moderate clouds. Batt insulation, in general, is a challenge to install correctly; fiberglass is carcinogenic; spray foam may be a health hazard; many rigid foam boards have high global warming potential; and cellulose may have unwanted fire retardants in it. Among the few remaining products are Air Krete, a limited availability, proprietary cement-based foaming insulation; and, if the fibers are large enough so as not to be carcinogenic, mineral wool — although it is primarily available in batts and subject to the same installation issues as all batt products. Let’s not forget about wool insulation, available in both batt and blown forms; however, it is costly and in limited supply.

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