What is required to maintain the continuity of the vapor retarder at joints and seams?

To maintain the continuity of the vapor retarder at joints and seams, it is essential for these areas to be sealed properly. A vapor retarder functions to slow the passage of moisture in the air, and any breach, such as an unsealed joint or seam, can compromise its effectiveness. Sealing creates a continuous barrier that prevents moisture from passing through, thereby protecting building materials from potential damage related to excess moisture, such as mold growth or structural decay.

Using a sealant appropriate for the materials involved ensures a tight seal that does not allow air or moisture to leak through. This is crucial for energy efficiency and maintaining appropriate humidity levels within the building. While other methods like taping could potentially provide a temporary solution, sealing is the standard practice to ensure long-lasting effectiveness of the vapor retarder.