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Whether it’s better to screw or glue drywall depends on your specific budget and project timeline. Professional drywall installers are more likely to use screws and fasteners than adhesives, but it takes longer. But if you are DIYing your drywall installation, glue is a perfectly fine choice if you’re willing to pay extra for adhesive.

Drywall installation costs around $2,000 on average, but some projects cost as low as $400, while larger or more complicated installations can cost $6,000 or more. The most important cost factor is the size of the room or area, as many contractors charge on a per-square-foot basis. You should also consider the complexity of the installation. If you have large, flat walls with few wall openings, you’ll pay less than if you have multiple windows and doors to cut around, corners, or curved walls.

Drywall insulation costs around $1,800, on average, but prices can range from $500 to $4,500, depending on a few different factors. The following things are important considerations to make when pricing out your insulation project:

• Square footage of insulation

• Type of insulation 

• Climate in your area and the insulation R-value required

• Whether or not your walls are already finished

• Accessibility of the area 

• Whether or not you need old insulation removed first

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.