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You do not need to drywall over most types of garage insulation. However, doing so can increase noise reduction, make the space more attractive, and keep children and pets from touching harmful fiberglass insulation. If you’re using cellulose or some other type of blown-in insulation (fiberglass and mineral wool are common), you will need drywall to contain the insulation material.

Most drywall used for interior walls of homes is 1/2-inch thick. This size strikes a balance of being easy to handle and hang while being thick enough for the durability needed on interior wall applications.

While you can put new drywall over old drywall, it’s not always the best option. In some cases, drywalling over drywall can make it harder to find wires and pipes behind your walls and conceal more serious problems with your walls. It can also make the room smaller. On the plus side, putting drywall over drywall can improve soundproofing and insulation. Plus, it’s often less expensive than tearing down and adding new drywall.

Whether you can reuse a drywall anchor or not depends on the type. Plastic expansion anchors and plastic self-drilling anchors, which expand once screwed into the wall, are single-use only. You can't straighten and reuse them after removing them from the wall.

Metal toggle bolts can be reused, provided you can successfully remove the toggle from behind the wall. Once you remove the bolt, the toggle often falls down and can be difficult to retrieve without removing the drywall.