Crawl Space Repair - Missing Vapor Barrier

This crawl space has little to no vapor barrier in it. The purpose of a vapor barrier is to impede water vapor from rising out of the earth and into the crawl space. Without a properly sealed barrier, the moisture in the earth will continue to rise into the crawl space environment, raising the relative humidity and ultimately contributing to microbial growth, the deterioration of insulation, and poor indoor air quality.