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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.

You should wait at least 24 hours between each coat of drywall mud before sanding and adding another coat. This ensures the mud dries completely, although drying time depends on temperature, humidity, and the type of compound used. Lightweight muds dry faster, while heavier all-purpose compounds take longer. Always check for firmness and dryness before sanding or applying the next layer.

If you plan on heating your garage, you must install a vapor barrier when drywalling the garage. A vapor barrier protects your garage from frost and mold that can occur through condensation. If your garage is unheated, you don't need to install a vapor barrier. The only exception is if you regularly crank the heat in your car before getting in it. In this case, you may still want to install a vapor barrier, as your car can heat your garage.

Eco-friendly options reduce environmental impact and often improve indoor air quality.