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The two most common types of drywall are ½-inch and ⅝-inch thick white or gray drywall. Most walls are ⅝-inch thick because the drywall is slightly more resistant to damage and it helps dampen sound considerably. It’s also much heavier, which is why most ceilings are ½-inch thick. There are special use cases where you want to use ⅝-inch thick drywall for ceilings, such as between a garage and living space, and the ceiling above a finished basement.

You can prevent air leaks and sagging by gluing a drywall ceiling. However, not every drywall job is a good fit for Sheetrock adhesive, and many pros say ceilings are one of those cases. When you place them properly, drywall screws make ceiling Sheetrock part of your home’s structural support system. 

Adding glue won’t increase the strength of the drywall, and it can make it much harder for you to remove and replace damaged drywall. Adhesive can bridge gaps, though, and it can keep temperature-controlled air from escaping or entering through the ceilings, making rooms more energy efficient.

While every home has its own unique needs, ceiling drywall installation typically follows a staggered or stepped pattern to enhance structural integrity and reduce the visibility of seams. Starting from one corner, sheets are placed perpendicular to the ceiling joists, with the ends of adjacent sheets meeting along the center of the joist. The next row begins with a half sheet, ensuring joints don't align vertically. This alternating pattern, combined with proper taping and mudding, creates a seamless appearance and strengthens the ceiling structure, minimizing the risk of cracks over time.

Yes, wainscoting is installed directly over drywall. However, ensure the drywall is in good shape since it will support the wainscoting. If the drywall has issues, such as holes, mold, or mildew, repair them before installing the wainscoting. Alternatively, you can install a plywood substrate before attaching the trim.