Be sure to keep the area extremely well ventilated to prevent asphyxiation. When exposed to a lot of water drywall tends to warp as the gypsum swells.
Dry the water damaged walls once the damaged drywall is removed start drying the area around and inside the wall.
How to repair water damaged ceiling drywall.
Place four drywall clips around the hole.
Removing wet insulation and drying the repair area is also treated along with the necessity for inspecting the structural materials for additional damage.
After removing the damaged drywall measure the size of the hole so you can cut out a patch from a new sheet of drywall.
How to repair major water damage.
Spray the damaged area with a mixture of 1 part bleach to 2 parts water in a spray bottle.
When it dries the gypsum may harden into a bulging wall or ceiling surface.
Use high efficiency blowers and dehumidifiers and open the windows and doors.
This will kill any mold that is present as well as start the process of removing the water stain.
This bulging gypsum will tend to be harder than before it got wet.
Use fans to increase air flow behind walls and leave them running for at least two days so the studs and flooring can completely dry.
How to repair a water damaged ceiling this article discusses the methods on how to repair a water damaged ceiling specifically when dealing with gypsum drywall or plaster.
Be careful not to overdrive the screw.
This will be true of plaster with gypsum board lath also.
Secure each one in place with a drywall screw making sure to countersink the screw head.
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