A build up of moisture and relative humidity in this crawl space resulted in falling insulation and mold growth on joists.
While a sump pump can evacuate some of the standing water in your crawl space, it does not control the relative humidity and eliminate the build up of moisture in your insulation and joists. An improperly installed sump pump can get clogged with dirt which can break down the sump pump. Using a sump pump with a basin and regular maintenance helps eliminate this issue.
Over time, moisture builds up in the insulation between your floor joists, this added weight, along with the help of gravity, results in falling and sagging insulation. The saturated insulation also holds this moisture against your joists and with the right relative humidity, can result in wood rot and mold growth.
Wet, humid crawl spaces promote mold growth, which can get into the air you breathe inside your home through the stack effect and crawl space duct work.
Moisture Damage in Providence Forge, VA Crawl Space