Styrofoam has a variety of uses. Styrofoam is composed of 98% air, making it lightweight and buoyant.

DuPont produces Styrofoam building materials, including varieties of building insulation sheathing and pipe insulation. The claimed R-value of Styrofoam insulation is five per inch.

Styrofoam can be used under roads and other structures to prevent soil disturbances due to freezing and thawing.

DuPont also produces Styrofoam blocks and other shapes for use by florists and in craft products. DuPont insulation Styrofoam has a distinctive blue color; Styrofoam for craft applications is available in white and green.
What are some uses of Styrofoam?
Styrofoam is used in building insulation, as a soil stabilization material,  and as crafting material.