A multi-family residential building is being constructed with an exterior wall assembly that includes a layer of rigid foam insulation. What is the minimum required thickness of the rigid foam insulation?
- A1 inch
- 2 inches
- C3 inches
- D4 inches
Exam tip
Be familiar with the specific thickness requirements for different types of insulation materials.
Why B is correct
According to Section R402.2.1 of the 2021 International Energy Conservation Code, the minimum required thickness of rigid foam insulation for exterior walls is 2 inches. Options A, C, and D are incorrect as they do not meet the code requirements.