Massachusetts Unrestricted Construction Supervisor License Practice Test

What type of insulation is typically required in foundation walls?

1. Rigid foam insulation

2. Fiberglass batts

3. Cellulose insulation

4. Reflective insulation

The correct answer is: Rigid foam insulation

Rigid foam insulation is typically required in foundation walls due to its excellent thermal performance and moisture resistance properties. This type of insulation provides a continuous barrier that reduces heat loss, which is vital in preventing frost heave and maintaining energy efficiency within a building. Rigid foam insulation comes in various thicknesses and types, such as expanded polystyrene (EPS) and extruded polystyrene (XPS), each offering distinct benefits like higher R-values and moisture resistance. Its structural properties allow it to be applied in direct contact with concrete, which is critical in foundation applications where exposure to moisture and potential ground pressure exists. While other insulation types like fiberglass batts or cellulose may be suitable in some areas, they are not as effective in environments that experience significant moisture exposure, such as foundation walls. Reflective insulation serves a different purpose by reflecting radiant heat rather than providing substantial thermal resistance in a foundational context, making rigid foam the preferred choice for this specific application.