What is the maximum spacing allowed for ceiling joists in a shower with 1/2 inch water-resistant gypsum board?

When installing ceiling joists in a shower area where 1/2 inch water-resistant gypsum board is used, it's important to adhere to the correct spacing guidelines to ensure structural integrity and proper support for moisture-laden environments. The maximum spacing for ceiling joists is typically 12 inches on center when using this type of gypsum board.

This tighter spacing helps to minimize sagging and potential damage due to moisture exposure, which is especially critical in a high-humidity area like a shower. Additionally, water-resistant gypsum board is designed to withstand more moisture than standard board, but it still requires appropriate structural support to prevent issues related to heavy loads or prolonged exposure to water.

In this context, while options with wider spacing may seem feasible, they do not provide the necessary support to ensure the longevity and safety of the installation. The 12-inch spacing is codified in various building standards and guidelines to address these concerns effectively, making it the most suitable choice.