Which type of insulation has a paper vapor barrier attached?

The type of insulation that has a paper vapor barrier attached is indeed the correct choice. Paper-backed insulation features a facing made of paper that acts as a vapor barrier. This is important in preventing moisture from penetrating the insulation, which can lead to mold growth and degradation of the insulation's effectiveness over time.

When it comes to insulation materials, the vapor barrier is crucial for maintaining the integrity of the insulated space. Paper-backed insulation is commonly used in residential buildings for walls and ceilings, where it serves to control moisture movement within the structure.

Other types of insulation, such as unfaced insulation, do not have any barrier attached, while foil-backed insulation uses a foil layer that serves as both a vapor barrier and a radiant barrier. Blanket insulation refers to rolls of insulation that can include various facings, but specifically, paper-backed insulation is identified for its paper vapor barrier feature. Thus, the specific characteristic of having a paper vapor barrier sets paper-backed insulation apart from these other types.