What happens if vapor barriers are not continuous?

When vapor barriers are not continuous, they can lead to moisture infiltration. A vapor barrier is designed to impede the movement of moisture through walls, ceilings, and floors in a building. If there are gaps, holes, or discontinuities in the vapor barrier, moisture-laden air can enter the conditioned space from areas such as the exterior, basement, or other high-moisture environments. This can result in problems such as mold growth, wood rot, and deterioration of building materials, ultimately compromising indoor air quality and structural integrity.

The effectiveness of a vapor barrier relies heavily on its continuous application. Any breaks or lack of sealing around penetrations (like pipes or electrical outlets) create pathways for moisture, undermining the barrier’s purpose. Therefore, maintaining a continuous vapor barrier is critical for controlling moisture and ensuring the longevity and health of a building.