Water damage is usually caused by flooding or broken pipes, which can freeze in winter, cracks and leaks in the house. This can cause extensive damage, and even the slightest of water problems can ruin the carpet and drywall, which are porous and can be destroyed by exposure to water. Always call experts to plan restoration on a water damage and try to dry everything as soon as possible to avoid exposure to mold and mildew.
The problem with carpet water damage is that the water often seeps down into the floor as well. Even if you dry the carpet out, this water filtering can cause problems below it, and you often need to replace the backing sheet as well as sections of the carpet. Generally, if the carpet is not cleaned and dried in 48 hours, then it needs to be replaced. You should also be very careful when drying the carpet, because drying a carpet can badly do stretching or deformation.
An expert can advise on different types of carpets and how best to dry them out, but often you will need to lift the floor mat and fans and dehumidifiers around the room, preferably drying equally along the damaged portion. Make sure the entire room and subfloor is dry before reinstalling or replacing the carpet, as any remaining moisture will attract mold. If the carpet has been exposed to any type of contaminated water, be prepared to replace it no matter what, because this can pose health risks if kept. To get rid of less dangerous dirt, try steam cleaning or vacuuming with a pinch of baking soda.
Restoration of drywall
If the plaster has been exposed to water, it is important that you cut the sections that have been affected. This plaster itself is probably ruined, and by removing the help section the wall will breathe, dry all trapped water and prevent further damage to the inner wall and other sections of drywall. If the plaster simply looks discolored and is not bent or deformed then it is capable of restoring with the shellac material.
After removing the plaster and drying the inner wall, you can place a patch over the open area, installing a new section of drywall with some compound of joints to smooth the edges. The wall will have to be repainted afterwards. If you feel inclined, you can replace the plaster with a waterproof version.