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Article in IIBEC Interface
Moisture Absorption in Polystyrene Insulation: Effects on In-Service Design R-Values. 
This article originally appeared in the November 2020 issue of IIBEC Interface. Visit IIBEC online at iibec.org to learn more.
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XPS Delivers High R-values in Below-grade
By John Woestman, Director
of Codes and Standards, XPSA
The Construction Specifier, August 2020
Download XPSA-08-2020.PDF



NEW! Technical Paper
Insulation Performance, Below Grade Series ID: IP-BG-02
“Effects of Moisture Absorption Mechanisms on In-Service Design R-Values of Polystyrene Insulation”
Download IP-BG-02

Insulation Performance, Below Grade Series ID: IP-BG-01
“Extruded Polystyrene Delivers Higher R-Values than Expanded Polystyrene in Below-Grade Applications, According to New University of Alaska Fairbanks Study”
Download IP-BG-01

Technical Insights
“Simple Experiments Demonstrate How Water Moves More Freely through EPS than XPS”
Download TI-BG-04

“Moisture Absorption Mechanisms in Polystyrene Foams Are Keys to Predicting Long-term Performance: XPS and EPS Behave Differently in Moist Below-Grade Applications”
Download TI-BG-03

“Limitations of Short-term Testing of XPS and EPS Polystyrene Foam Insulation: An Overview of Moisture Absorption in Polystyrene Foam Insulations”
Download TI-BG-02

“New Data Confirms Superior Performance of XPS versus EPS in Cold Regions, Below Grade Applications”
Download TI-BG-01

In residential and commercial building applications, insulation is necessary to maintain temperature control. XPS foam insulation is a premier choice for building planners because it is highly energy efficient, resulting in significant savings in energy use—and in energy costs.

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Extruded polystyrene foam is the best insulation you can choose when it comes to resisting water moisture absorption. No other foam building insulation provides the same level of protection against water damage as XPS foam.

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According to the U.S. EPA, buildings account for an estimated 36 percent of total energy use and 30 percent of greenhouse gas emissions. Energy efficient XPS foam insulation products provide numerous environmental benefits, including major reduction in energy use and resulting greenhouse emissions. Life cycle analyses show XPS foam to be a sustainable choice. Find out more…

Did you know?

Extruded polystyrene foam insulation (XPS) and molded bead expanded polystyrene insulation (EPS) are similar, but have a lot of differences as well. XPS is the superior product when considering R-value, moisture resistance, thermal performance and compressive strength. See here for more information.