See also: Plastic Insulation

Dow Building Solutions
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STYROFOAM™ Brand Extruded Polystyrene (XPS) Foam was invented by Dow more than 60 years ago. Recognized by its trademark BLUE™ color, STYROFOAM™ Brand XPS Foam Insulation features a closed-cell structure, high R-value of 5.0 per inch and the highest moisture resistance of any foam plastic insulation. It provides long-lasting thermal performance in roof, wall and below-grade applications.