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Drywall mud should be left to dry for at least 24 hours before sanding, though drying time depends on the thickness of the application, humidity, and room temperature. Thicker layers or projects done in high humidity may require 48 hours or more of drying time. You’ll know the mud is ready when it feels completely dry and appears light in color throughout. Sanding too early can cause smudging or gouges, so patience is key for a smooth, professional-looking finish.

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.

Drywall can get wet and dry out without sustaining permanent damage, but only if the water damage is minor. If you have a small leak and are quick to correct the issue and set up blower fans and dehumidifiers, your drywall should dry out. If the leak is persistent, the drywall becomes totally waterlogged, or mold begins forming on the drywall, you should remove and replace it.

Installing drywall will cost between $1.50 and $3 per square foot for materials, labor, and finishing, which is quite a bit lower than the average of $9 to $13 per square foot for a drop-tile ceiling. So, while drop ceilings allow more design flexibility, provide easy access to utility lines above them, and are often much easier and less expensive to repair, they do cost more upfront. You can minimize your drop ceiling cost by opting for more affordable fiberboard panels, although some homeowners don’t like the look of this material.