We Have the Proof. Science Doesn’t Lie.

The Expanded Polystyrene (EPS) Foam industry has put out extensive messaging about how EPS foam performs the same, if not better, than Extruded Polystyrene (XPS) Rigid Foam Insulation when it comes to R-value and moisture.

But you only have to look at the science to see XPS’ superiority.

• Science proves that XPS foam is more moisture-resistant than EPS foam*
• Science proves that XPS foam holds R-value better than EPS foam at lower mean temperatures when water is present*

View these resources and see the proof for yourself.

*ASTM C272 and ASTM C518. Also see Owens Corning technical document: “Extrusion Matters” for more details.