What is one characteristic of nesting insulation?

Nesting insulation is specifically designed with a characteristic that allows it to be compact and efficient for storage and installation. The option highlighting that it is used for increasing thickness is aligned with how nesting insulation is utilized in various applications. As nesting insulation is often layered or stacked efficiently, it allows for the adjustment of insulation thickness to meet specific energy efficiency requirements.

This adaptability in thickness helps ensure that the insulation fits within various cavity spaces while still providing effective thermal resistance. The ability to adjust thickness is crucial for achieving optimal performance, particularly in different building contexts, indicating its primary utility in enhancing the insulation's overall effectiveness.

In contrast, other options do not fully capture the essence of nesting insulation. For instance, the notion that it is primarily used in external walls does not encompass its versatility; it can also be utilized in attics and internal partitions. Meanwhile, inconsistent seam alignment is not a feature of nesting insulation, which is designed to fit together snugly and effectively reduce gaps. Lastly, while it may contribute to sound insulation due to its mass, its primary characteristic centers around the ability to increase thickness for thermal efficiency rather than being solely focused on soundproofing.