Which insulation type is primarily tan in color and utilized in masonry-block wall cavities?

Vermiculite insulation is primarily tan in color and is known for its use in masonry-block wall cavities. This type of insulation consists of naturally occurring mineral flakes that expand when heated, resulting in a lightweight, non-combustible, and moisture-resistant material. Its tan hue is a characteristic feature, making it easily identifiable.

Vermiculite's unique properties, such as its ability to provide good thermal insulation while also supporting structural integrity when used in wall cavities, contribute to its selection for masonry-block applications. Its effectiveness in these environments is enhanced by its excellent fire resistance and soundproofing capabilities.