How should gypsum board be treated in relation to the interior air barrier?

Gypsum board serves as an important component in building assemblies, particularly concerning the control of air and moisture movement within the structure. Proper treatment of gypsum board in relation to the interior air barrier is essential for achieving optimal performance of the building envelope.

Sealing all connections in gypsum board is crucial to prevent air leakage, which can compromise energy efficiency and indoor air quality. When gypsum board is installed, seams, joints, and penetrations must be properly sealed to create a continuous air barrier. This not only helps in reducing drafts but also prevents moisture-laden air from entering the wall assembly, which could lead to issues such as mold growth or material degradation.

Leaving it unsealed or installing it without additional sealing would undermine the effectiveness of the air barrier, allowing for unwanted air infiltration. While painting can enhance moisture resistance, it does not address the critical need for sealing joints and connections to ensure an effective air barrier.

Hence, treating gypsum board by sealing it at all connections aligns with best practices in building science, ensuring a continuous and effective air and moisture barrier.