Vermiculite/Perlite Insulation

Vermiculite is a mica-like laminar material; Perlite, a naturally occurring volcanic glass. Both are heat-expanded materials familiar to gardeners as planting media. Because they are inexpensive insulators, they are useful as home insulation.

Besides their relatively low cost, other advantages include being easy to install because they pour to fill irregular spaces, they are also non-corrosive, non-combustible and vermin resistant.