Red Seal Insulator (Heat and Frost) Practice Exam

What is the difference between faced and unfaced insulation?

1. Faced insulation contains a vapor barrier, while unfaced insulation does not

2. Faced insulation is thicker than unfaced insulation

3. Unfaced insulation is more expensive

4. Faced insulation is only used in ceilings

The correct answer is: Faced insulation contains a vapor barrier, while unfaced insulation does not

Faced insulation contains a vapor barrier, which is typically made from a material such as kraft paper, foil, or plastic. This vapor barrier is crucial as it helps to reduce moisture migration, thereby preventing condensation within the insulation and the building structure. The presence of this barrier in faced insulation makes it most suitable for areas that are prone to humidity, such as exterior walls, ceilings, and floors, as it aids in maintaining energy efficiency by mitigating heat loss and protecting against mold growth. In contrast, unfaced insulation lacks this vapor barrier, making it more versatile in use in spaces where moisture control is not as critical, such as inside walls, in attics, or where the insulation is already enclosed by a vapor-resistant material. The practical difference in application per insulation type is significant, especially for building codes and energy efficiency considerations. Other options may suggest that faced insulation is simply thicker, more expensive, or limited to specific locations, but these comparisons do not define the core characteristic that differentiates faced from unfaced insulation, which is the presence or absence of a vapor barrier.