How does density affect performance?

The lower densities (3/4# to 1.5#) of foam have greater cushioning effect, but less strength and lower insulating performance (lower R-Value) while higher densities (2.0# and 3.0#) are stronger and are better insulators (higher R-Value).  Density is a primary driver of cost, since more raw material is required to produce a denser foam.


What are the different densities of EPS?

The density of EPS is measured in pounds per cubic foot (PCF). The most commonly used densities include ¾, 1, 1-¼, 1-½, 2, and 3 PCF.