Underlayment provides structural support, noise reduction, and moisture protection. When it fails, the flooring system loses stability. Look for signs like uneven surfaces, persistent squeaks, or gaps opening between planks. In some cases, a moisture-related failure will result in visible mold or an musty odor. If you suspect underlayment failure, a professional inspection is required to determine if the existing flooring can be salvaged or if a complete replacement is necessary.

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