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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.

Furring strips, thin strips of wood or metal, are not always required for ceiling drywall installation. If the ceiling surface is even and in good condition, drywall can be directly attached to the ceiling joists using screws. However, furring strips become essential when dealing with irregular surfaces or when additional insulation or soundproofing is needed. They create a level substrate for attaching the drywall. Ultimately, the decision to use furring strips depends on the condition of the existing ceiling and the specific requirements of the project.

Level 4 is the most commonly used drywall finish for visible interior walls. Finishing the drywall to Level 4 rovides a smooth surface ready to be painted with flat paint. 

Level 2 and 3 finishing are also common, particularly on walls that will get covered.

Drywall tape is made of paper, while drywall mesh is made of fiberglass or metal. Drywall mesh patches are suitable for repairing small holes in drywall, while paper drywall tape holds a crease better for corners. You need joint compound to adhere drywall tape to the wall, while mesh patches may be self-adhesive.