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If you plan on heating your garage, you must install a vapor barrier when drywalling the garage. A vapor barrier protects your garage from frost and mold that can occur through condensation. If your garage is unheated, you don't need to install a vapor barrier. The only exception is if you regularly crank the heat in your car before getting in it. In this case, you may still want to install a vapor barrier, as your car can heat your garage.

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.

Water-damaged drywall should almost always be replaced. Not only does it look bad, it’s a breeding ground for toxic mold. Even if you think the area is dry and there’s no active leak, the only way to be sure is to cut out the damaged area and see for yourself.

No, rough-in plumbing is one of the last steps before your drywall goes up. This is because essential things like pipe installation require space before other elements go up. After the rough-in plumbing is complete, your inspector will also come to conduct an examination and tell you if your plumbing is approved and satisfies your building permit.