Air Krete. The company’s magnesium silicate, cement-based insulation is foamed or pumped into closed cavities. This insulation is purportedly hypoallergenic and popular with chemically sensitive people, the company claims. Since it is not temperature sensitive, it can be installed indoors under any weather conditions and tolerates contact with high-heat sources, such as exhaust pipes, without concerns for combustion. The product is fully recyclable and can be used for soil enrichment. Air Krete has an R-value of about 3.9 per inch. 315.834.6609.