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Commercial Senior Certified


Indoor Environmental Quality

Thermal Resistance

Understanding thermal resistance is key to understanding how the air moving through a building envelope contributes to indoor environmental quality. This lesson examines the impact of a wall system's R-value on moisture and heat flow in a commercial building.

Learning Objectives

At the conclusion of this lesson, you will be able to:

  • Explain the impact of R-values on moisture control and air infiltration
  • Describe in general terms how insulation works
  • Define heat flow and describe how it is measured by system designers
  • Differentiate between series heat flow and parallel heat flow
  • Describe four ways to measure R-value
  • Explain how system designers calculate the total R-value of a wall

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