When to replace water-damaged drywall (vs. dry it in place)
Some wet drywall saves with proper drying. Some has to come out. The difference is the water category and how long it sat wet.
What you'll learn
- Why Cat 1 (clean) water often saves drywall and Cat 3 (sewage/flood) does not
- The 24-inch flood cut rule for contaminated water
- When drywall stains are surface-only vs. cavity-deep
- How thermal imaging finds wet drywall you cannot see
Step by step
- Identify the water category (clean / gray / black).
- Check for sagging, bubbling, or staining beyond the obvious wet area.
- Use a moisture meter on the drywall and the framing behind it.
- For Cat 2 and Cat 3 water, plan flood cuts at the standard line.
- Dry the cavity before any drywall replacement.
Safety note
Drywall that is dry on the surface but wet in the cavity will grow mold within weeks. Cavity drying with InjectiDry hoses is often the fix that lets you keep the wall.
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