What is the primary difference between faced batts and unfaced batts?

The primary difference between faced batts and unfaced batts lies in their construction and intended use, which is accurately captured by the selection regarding faced batts having a paper backing. Faced batts come with a vapor barrier on one side, typically made of kraft paper or foil, which helps to control moisture movement and prevent condensation within walls and ceilings. This feature makes them particularly useful in certain applications where moisture control is essential, such as in exterior walls or ceilings above living spaces.

Unfaced batts, on the other hand, lack this vapor barrier, which makes them more suitable for uses where moisture is not as much of a concern, or where additional moisture control is provided through other means. The absence of the face also allows for easier installation in certain areas, but without the benefit of a vapor barrier.

The other options provided relate to characteristics that either do not accurately describe the distinctions or misrepresent the materials. For instance, thickness is not a defining element between these types of batts, as both can come in various thicknesses depending on the R-value requirements. Additionally, cost can vary based on brand, quality, and where the materials are purchased, so there is no definitive price difference inherent to whether a batt is faced or unf