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Most drywall used for interior walls of homes is 1/2-inch thick. This size strikes a balance of being easy to handle and hang while being thick enough for the durability needed on interior wall applications.

Drywall does not necessarily need to be glued to the ceiling, especially when it is properly screwed or nailed into place. Drywall is typically attached to the ceiling joists using screws or nails, ensuring a secure and stable drywall installation. 

However, in certain situations where additional adhesion is required, construction adhesive can be applied in combination with screws or nails. This is often done for ceilings with specific acoustic or insulation requirements. It's essential to follow local building codes and best practices to determine if adhesive use is necessary for your specific project.

In most cases, walls don’t have to be removed to rewire a house. Much of the new wiring can be run through attics and crawlspaces, and then electricians often use a tool called fish tape to pull the cables through the walls via cut access points that can be easily patched up without requiring any major demo work.

You should stagger drywall sheets to help prevent cracking. The joints between drywall sheets are the weak spots, so if you install drywall with seams aligned, you’ll create weak lines that run across the length of the wall and extend from floor to ceiling. But when you stagger drywall, the solid sections of panels will support the joints. This can prevent seams from cracking or separating due to fluctuating temperature and humidity, vibrations from movement inside the home, and gravity.