Perlite and Vermiculite was used in 20. Century basically in the attic areas. But not anymore because of some toxic components. Perlite and Vermiculite are basically heat-expanded materials and their benefit it’s their price level. That’s one of the reasons why lots of people use them as insulation material.

Perlite and Vermiculite insulation materials are very easy to install and they are non-corrosive and also vermin resistant.

Vermiculite is also very popular in paint business, where it’s used as paint filler or paint textures. In construction business vermiculite is mostly used as a pool base under vinyl and also very popular in masonry fire proofing insulation.