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Yes, 1/2-inch thick drywall is commonly used for ceilings in residential construction. It provides adequate support and is easier to handle and install compared to thicker drywall sheets. Thicker drywall, such as 5/8-inch, is typically used for ceilings in commercial buildings or areas requiring additional fire resistance or soundproofing. However, for most standard residential applications, 1/2-inch drywall is sufficient and widely accepted.

Drywall installation is considerably faster and more affordable than plastering. Because plastering involves applying a wet material, it’s more time-consuming, takes longer to dry, and is more prone to cracking. It doesn’t tend to be as insulative either. If you need resurfacing work done on the walls, it's not unusual for the cost of plastering to hit $10 per square foot, which is much higher than the drywall installation costs of $1.50 to $3 per square foot.

If you’re looking for good soundproofing and want a high-end look in a historic home, though, plastering may be the better option.

The best way to make long, straight cuts is to use a utility knife and a T-square to score the sheet, snap along the score, and then finish the cut by cutting through the paper on the opposite side with the utility knife. If you’re making small cuts, curved cuts, or cutouts for electrical boxes or light fixtures, you can use a manual jab saw to keep costs down, but an electric spiral saw or oscillating multi-tool will get the cleanest, fastest cuts possible.

Yes, any parts of drywall that are wet or overly moist will need to be replaced. Drywall is intended to be dry (it’s in the name, after all.), as excess moisture can lead to mold and mildew and eventually corrode your home’s foundational building pieces. Do regular inspections in your home to make sure all your plumbing is intact and in good condition—this will go a long way toward preventing leaks.