What common building material should be replaced if heavily infested by mold?

When considering the common building material that should be replaced if heavily infested by mold, the most suitable answer is drywall. Drywall is particularly susceptible to mold growth due to its composition, which typically includes gypsum encased in paper. When drywall becomes wet or humid, it provides an ideal environment for mold proliferation.

Once mold establishes itself in drywall, it can lead to significant structural issues and health risks for occupants. Unlike some other materials, such as wood flooring or ceiling tiles, drywall generally cannot be effectively cleaned and remediated when mold infestation is severe. The absorption of moisture by drywall further complicates matters, as this can cause deterioration of the material, compromising its integrity and leading to potential collapse if not addressed promptly.

In many cases, remediation efforts will focus on removing and replacing the affected drywall to ensure that mold spores do not spread to other parts of the building. This proactive approach is essential in maintaining indoor air quality and safeguarding public health. While other materials like wood flooring, roof shingles, and ceiling tiles can also be impacted by mold, they may not require replacement unless they are extensively damaged or compromised. Therefore, drywall is the most critical material to consider replacing in the event of heavy mold infestation.