Some wallboard in my house got really soaked. Should I repair it or replace it?
Wallboard, sheet rock(USG), gypsum board is made by adhering paper(in most cases) to the gypsum. If it is just damp and it dries out flat and there is no mold, you should be able to prime and repaint it once it is fully dry. However, if it is thoroughly soaked or shows signs of bubbling or cracking or warping or mold it is time to replace that section. You may be able to save a little money if you find a half or broken sheet of drywall to patch in this section at the local lumberyard. Unless you need a full sheet. This link has a brief drywall guide and this handy reference will guide you through the entire process if you have never repaired wallboard before, Drywall Book. Be sure to check the thickness of your original drywall or you will be making a second trip to the lumberyard.