Wet drywall is sometimes salvageable and sometimes not. The deciding factors are the type of water, the condition of the board and what is behind it.
Before deciding how to dry drywall, decide what soaked it. Drywall is porous paper and gypsum, and it holds whatever the water carried. If the water was sewage or floodwater, health agencies advise removing the drywall instead of trying to save it. The Red Cross likewise says to remove all drywall and insulation that touched floodwater. Use our categories guide if you are not sure.
If the water was clean, such as a supply line leak caught quickly, drying in place can be reasonable. The longer drywall stays wet, the less likely that is. EPA guidance targets drying within 24 to 48 hours to avoid mold.
EPA guidance says wallboard with obvious swelling or broken seams should be discarded or replaced, while wallboard without those problems may be dried in place. Other signs point the same way and are common sense.
Take off baseboards and any trim or wall coverings that trap moisture against the board. Remove standing water and wet carpet along the wall. Then combine airflow and dehumidification: air movers aimed along the wall and a dehumidifier running in the closed room. Our air mover guide explains how restoration crews decide how many.
Surface dryness is misleading. A wall can feel dry while the cavity and the back of the board hold water. Use a moisture meter, and compare readings with an unaffected wall of the same material. Pros sometimes drill small holes or remove a strip near the floor to let air into the cavity. Keep drying until the readings match.
When the board has to go, plan the removal. Turn off power to any outlets in the wall first, and make sure you know where wiring and plumbing run before cutting. Wear a respirator, gloves and eye protection, because demolition throws dust. A HEPA air scrubber in the work area helps capture airborne particles.
Cut and remove the wet section, taking more than the visibly wet portion if moisture has wicked above it. Check readings above the cut and keep opening until you reach dry board. Then remove wet insulation behind it, let the framing dry and verify that the studs and bottom plate read dry before any new board goes up. Bag debris, and keep a sample of material for the insurer if needed.
Homes of a certain age may contain asbestos or lead paint in wall materials, and cutting or sanding them can release hazardous dust. Check the age of the house and, if there is any doubt, have materials tested before disturbing them. Rules on testing and disposal vary by state and locality. Contaminated or large-scale demolition is best left to a licensed professional.
Replacement drywall goes in after the framing and cavity read dry, and after the source of the water is fixed. Health agencies note that replacing drywall and carpet should wait until everything is fully dry, which in severe cases can take weeks or months. Closing up a wall over moisture is how a small leak turns into hidden mold. If problems appear later, see mold after water damage.
A pin or pinless moisture meter is the most useful tool for this job, along with a utility knife, a stud finder and a flashlight. A cheap thermometer or humidity gauge in the room tells you whether the dehumidifier is actually bringing humidity down. For demolition, add a respirator, safety glasses, gloves and heavy trash bags.
If you are renting, think about the whole stack: extraction to remove standing water, air movers to push air along the wall, a dehumidifier to take out the moisture and a scrubber if you will be cutting. Each does a different part of the job, and skipping one tends to show up as slow readings.
A restoration professional can check what you cannot see: moisture behind tile, inside wall cavities and under cabinets. They can also judge whether a wall can be dried in place and document the decision for an insurer, which is useful if the claim is questioned later.
When water has reached electrical boxes, structural framing or a large number of rooms, or when the building is old enough to have materials of concern, a professional assessment is worth the cost. Rules on licensing and on who may do demolition vary by state.
A final check before any repair work: confirm that the source of the water is fixed, that the framing and cavity read dry, and that nothing in the wall, including insulation and trim, is still holding moisture. Rushing this step is the most common reason repairs have to be redone. If you are unsure, take readings for a few days in a row and see whether they stay stable. A wall that dries and then climbs back up is telling you the water source or a hidden pocket of moisture has not been dealt with, and closing it up will hide the problem, not solve it.
Sometimes. Drywall wet with clean water and without swelling or broken seams may be dried in place, but board contacted by sewage or floodwater should be removed.
Use a moisture meter and compare with an unaffected wall of the same material. Surface feel is not reliable.
EPA guidance lists insulation among items to discard or replace after water damage. Wet insulation can hold moisture against the framing.
It can be, with power off, protective gear and awareness of wiring and plumbing. Older homes may contain asbestos or lead, and contaminated water calls for professionals.
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