air krete insulation is fire proof, environmentally friendly, safe and non-toxic insulation. free of cfc's & formaldehyde, mold resistant & pest resistant because air krete has a drying effect on the pests. air krete is a foamed in mgo base product that completely fill all cavities including door and window casings and has a great r value of 3.9 per inch. there is 0% shrinkage and has acoustical properties. air krete acts like a blanket that deadens noise from outside the house. air krete was used for this purpose in the neil young sound studios in santa cruz and musicians institute in hollywood ca. air krete is an all green insulation.