What must be done if carpet is reinstalled over an improperly dried underlayment?

Reinstalling carpet over an improperly dried underlayment poses significant risks, including mold growth, unpleasant odors, and deterioration of both the underlayment and carpet. Proper drying is crucial because moisture trapped underneath the carpet can lead to conditions that are conducive to mold and mildew, which can cause health issues and further damage to the flooring.

Replacing the underlayment or thoroughly drying it ensures that the carpet is installed on a stable, dry surface, which is essential for maintaining the integrity and longevity of both the underlayment and the carpet itself. Thorough drying can involve using specialized equipment like dehumidifiers and fans to eliminate any moisture that remains.

Other options do not adequately address the core issue of moisture. Shampooing simply cleans the surface and does nothing to remove trapped moisture, while covering with a plastic sheet can actually trap moisture in and create a more severe problem. Leaving the underlayment as it is allows for ongoing moisture-related complications that can result in costly repairs and health risks. Therefore, ensuring the underlayment is either replaced or thoroughly dried is the best direct action to take when faced with this situation.