What is the main characteristic of unfaced batt insulation?

Unfaced batt insulation is characterized by its lack of any backing material. This means it does not have a layer of paper or other materials that can serve as a vapor barrier, which is typical of faced insulation. The absence of a backing makes unfaced batt insulation particularly suitable for applications where a vapor barrier is not needed or where air flow around the insulation is beneficial, such as in walls and ceilings that are not exposed to moisture.

The decision to use unfaced insulation often hinges on the specific requirements of the construction project and the environmental controls in place. This type of insulation is also easier to cut and manipulate during installation, which is advantageous in tight or irregular spaces.

In contrast, faced insulation—typically equipped with a paper or foil backing—serves to control moisture and can play a role in energy efficiency. Understanding the lack of facing in unfaced batt insulation is key in selecting the right type of insulation for any given scenario, especially in regard to moisture control and installation practices.