What is the sequence of attaching gypsum wallboard at the ceiling intersection?

Attaching gypsum wallboard at the ceiling intersection typically follows the practice of installing the ceiling boards first before proceeding to the walls. This method is beneficial for several reasons.

First, by installing the ceiling boards first, you create a clean joint where the wallboard meets the ceiling. This not only improves the aesthetic finish but also allows for easier taping and mudding of seams, resulting in smoother transitions and less visible joints after finishing.

Additionally, when the ceiling board is installed first, it provides a solid backing for the wall boards that will be installed next, ensuring better support and minimizing the risk of sagging or misalignment at the seams. If wall boards were installed first, it could complicate the process of fitting the ceiling boards snugly against the walls, leading to potential gaps or uneven areas that would require extra work to correct.

In summary, the recommended sequence of first installing the ceiling gypsum wallboard before the walls ensures a neater finish and a more structurally sound installation, which is why this choice is regarded as the best practice.