how to install access panel in drywall ceiling
T-bar ceiling grids come in standard dimensions, primarily based on the size of the tiles they support. The most common grid size in commercial applications is 2 feet by 2 feet (24 inches by 24 inches) and 2 feet by 4 feet (24 inches by 48 inches). The grid itself is usually constructed from 0.019-inch thick galvanized steel and is available in various widths, typically ranging from 15/16 inch to 1 inch.