find moisture under carpet 4

https://getmoldgrowthcarpetbacking.vantagequill.com/posts/understanding-mold-growth-on-carpet-backing-causes-detection-and-remediation

When you step on a spot that feels spongy underfoot or notice a musty smell, it’s worth checking for moisture under the carpet. Even a small leak from a pipe or humidity trapped below can lead to mold and damage over time. Lifting a corner gently lets you see if the padding or floorboards are damp.