An Objective Comparison of Rigid Polystyrene Insulations – EPS and XPS

This presentation will showcase the similarities and differences between the manufacturing processes of expanded polystyrene (EPS) and extruded polystyrene (XPS), as well as the environmental and sustainable benefits they possess. During the course, attendees will learn about the benefits of meeting ASTM C578 requirements and how to determine which product is best for their project based on application and cost.


Learning Objectives:
  1. Define and understand the similarities and differences between how EPS and XPS are manufactured.
  2. Learn about the environmental features and benefits of polystyrene insulation including recyclability, LEED, thermal performance, energy efficiency, reducing global warming, and mold resistance.
  3. Understand ASTM C578: Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation by reviewing physical property data of both EPS and XPS (compressive strength, long-term moisture retention, and sustainable R-value).
  4. Analyze the project and determine what application, R-value, and PSI are best for the building.
Education Content: Beginner
Course Accreditation:
American Institute of Architects (AIA) | 1 AIA LU/Elective | Course Number: EPS101-INSe
International Institute of Building Enclosure Consultants (IIBEC) | 1 IIBEC CEH