Subfloor Damage

« Back to Glossary Index

Subfloor damage happens when water seeps through your floors and soaks the hidden layer beneath (usually plywood or OSB wood). It’s like a secret sponge under your carpet or tiles—you might not see it, but it can rot, warp, or grow mold if not fixed fast!

Warning Signs:

  • Squishy floors (bouncy or soft spots when walking)
  • Musty smells (mold growing underneath)
  • Buckling tiles (water swells the subfloor, popping tiles up)
  • Stained baseboards (water wicks up walls from below)

Why It’s Tricky:

  • Often hidden until major damage is done
  • Requires pulling up flooring (like carpet, laminate, or vinyl) to access
  • Can compromise structural safety if left untreated

ExampleAfter the fridge leak, the laminate floor looked fine—but the subfloor underneath was black with mold and had to be replaced.

💡 Key Fact: Subfloors dry 10x slower than surface floors—special drying mats or injections are often needed!

⚠️ DIY Danger: If you miss even 5% moisture, mold can regrow. Pros use moisture meters to check.

VisualLike termite damage… but caused by water instead of bugs! 🐜➡️💦

« Back to Glossary Index