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Which foam type is better – Murus polyurethane, EPS, or XPS?

April 26, 2017EPS foam Murus polyurethane type XPS

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Which foam type is better – Murus polyurethane, EPS, or XPS?

1 Answer

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No foam type is necessarily better than the other; rather, each foam type has unique properties and may offer advantages in certain instances. The primary differences between the three are the density and insulating characteristics of the foam. EPS foam density is a nominal 1 pound per cubic foot, XPS foam density is a nominal 1.5 pounds per cubic foot, and Polyurethane density is nominally 2.2 pounds per cubic foot. Therefore, a 4-1/2″ thick EPS panel will yield an R-value of R-16; a 4-1/2″ thick XPS panel will yield R-19, and a 4-1/2″ thick PUR panel will yield R-26.