EPS Verses XPS

The battle began, EPS verses XPS, and the test results are in.  Expanded polystyrene (EPS) is the winner!  This was clearly  shown in an independent, third-party test.  Expanded polystyrene (EPS) maintains its R-value even after long-term exposure in northern climates.  Extruded polystyrene (XPS) was shown to have lost R-value over time.  In this 15 year side by side dual EPS outperforms XPS in both R-value retention and decreased water absorption.  XPS insulation was reduced by ...