What type of insulation can be used for interior foundation wall insulation?

Sheet insulation or closed-cell foam insulation is an appropriate choice for insulating interior foundation walls due to several key factors related to moisture control, thermal performance, and overall effectiveness.

When it comes to foundation walls, it is crucial to select insulation that can withstand potential exposure to moisture. Closed-cell foam insulation, for instance, provides not only a high R-value, meaning it offers excellent thermal resistance, but it also acts as a moisture barrier. This characteristic helps prevent water from penetrating through the wall assembly, reducing the risk of mold and damage to the structure over time.

Sheet insulation, which can be made from materials like Extruded Polystyrene (XPS) or Polyisocyanurate, is also particularly effective in these applications. It is easy to install and cuts to size, allowing for a snug fit against the foundation, which enhances its insulating properties.

Additionally, using these types of insulation can lead to improved energy performance of the building by minimizing thermal bridging, thus maintaining a comfortable interior temperature while also promoting energy efficiency.

In contrast, other options may not provide the same benefits. For example, fiberglass batt insulation, while commonly used, is less effective in moist environments and can absorb moisture, leading to reduced performance and potential for mold growth. Open