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Any level over 17% moisture should be replaced, as this could be a sign that the drywall is too compromised to be considered safe. A contractor or water restoration provider can come out and use a moisture meter to check the moisture level in your drywall. 

If after a visual inspection you’re still unsure about if your drywall is salvageable, a professional reading is the next best option.

In most cases, no, you won’t need a permit to replace drywall. If you’re changing the floorplan of your home by adding or removing walls during the drywall project, then you might need a permit, but replacement or repairs usually doesn’t require a permit. Your drywall professional should be able to confirm whether or not a permit is required for your project. If it is, it’s likely to add between $50 and $150 to your total cost. Keep in mind that you will need permits if you plan to install new electrical wiring or plumbing lines behind your new drywall.

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.

The average life span for drywall is between 40 and 60 years, although panels can last significantly longer in many cases if it’s well-maintained. Of course, many things can reduce the life span of your drywall, including fire, smoke damage, water, moisture, and physical damage, like dents and holes. Thankfully, you’re likely to get around 50 years of value out of professionally-installed drywall, making the $2,000 you’ll spend on the job well worth it in the long run.