Depending on the extent of your water damage repair, you face a few options with your drywall. Flooding often affects your walls. If you act quickly, you may be able to save the drywall and avoid ripping it out and installing more. Check for swelling and sagging. If there is less than three-eighths of an inch from the baseline, then you should only have to cut out the wet section and put in a new piece.
Extensive flooding may cause more damage to the drywall. If your drywall damage surpasses the three-eights of an inch threshold, you’ll have to tear out the sheet and put in a new one. It’s also important to test the insulation. If it is wet after a flood, you should take it out and replace it as well.