What is required as an additional treatment measure if water-conducting rot is present in the crawl space?

The presence of water-conducting rot, often identified by the existence of visible rhizomorphs and fungal growth in a crawl space, signals a serious fungal infection that can compromise structural integrity if not addressed promptly. Cutting visible rhizomorphs—these thread-like structures that connect and transport moisture to the fungus—and scraping off visible fungal growth helps in directly removing parts of the infestation. This method is essential as it targets the source of the rot, preventing further spread and damage.

Addressing just the symptoms or sealing the space without removal of the rot can allow for continued moisture retention and fungal growth, which could worsen the condition over time. Installing a new vapor barrier is also a preventative measure; however, it does not address the existing infestation. It is crucial to first eliminate the active fungal presence before implementing any other measures like vapor barriers or sealing the crawl space to ensure that the underlying problem is resolved, allowing for a safe and effective treatment environment.