Do you have to replace drywall after water damage?
Not always. Drywall that got only clean water and is caught quickly can often be dried in place. It must be replaced if it was soaked for days, has sagged or crumbled, shows mould, or touched sewage or floodwater. A moisture reading decides, not appearance.
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When drywall can often be dried
- The water was clean supply water, such as a pipe or appliance leak
- Drying started within a day or two
- The board is firm and not swollen or stained through
- Readings fall to the dry target in the following days
- There is no mould on the paper or in the cavity
When drywall has to be removed
- The water was sewage or floodwater
- The board crumbles, sags or has lifted seams
- It stayed wet for several days
- There is mould growth
- The insulation behind it is soaked and cannot be dried in place
Why a reading matters more than a look
Gypsum board can look fine and still be wet inside. Paper facing feeds mould, and the cavity behind holds moisture. A crew uses meters and thermal imaging to check the wall, and drilled or cut openings let air in to dry the cavity. A cut at the bottom of a wall, called a flood cut, removes the wettest section and is much cheaper than rebuilding the whole wall.
When a wall must come out, removal limits the problem and a clean opening dries quickly.
Insulation and the wall cavity
Drywall is only half of the wall. Insulation behind it, particularly fibreglass batts, can hold water against the studs. Some insulation dries, and some compresses and stays wet. The cavity has to be opened or probed to find out.
Leaving wet insulation in a sealed wall is one of the most common causes of hidden mould after a flood.
What replacement involves
New board is hung, taped, sanded, primed and painted, and insulation and trim are put back. We do this as part of the job, so the crew that dried the wall is accountable for the finish. See our basement flooding service in Etobicoke and our water damage restoration page for how it fits. The assessment is free, and a written scope and price come first. If you notice mould, our mould removal service applies.
Related questions
Can wet drywall be saved with a fan?
A fan alone rarely dries the cavity, and it can leave moisture behind.
Is replacing drywall expensive?
The cost depends on how much comes out, which is why a measured scope matters. Quotes are free.
Will the new wall match?
Yes. Taping, sanding and painting are part of a proper repair.
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