Is there wet or falling or rodent-infested fiberglass insulation in the crawl area?
If so there is a high risk of mold or rodent contaminants that could present a fungal, bacterial, or viral airborne hazard. We recommend completely removing all fiberglass insulation from crawl spaces. Do not enter such an area without protective gear. See Mold in Fiberglass Insulation. Fiberglass is an effective and cost-effective building insulation product that performs very well in many applications. And from the factory you can expect fiberglass building insulation products to be nice and clean. But we do not recommend this material for use in crawl spaces or other tight, limited-access under-building areas nor for use against foundation walls. If the floors above a crawl area or the rim joist or perimeter of the building need to be insulated we prefer to use spray foam or solid foam insulation in such areas because they resist moisture uptake. Here is a photo of a crawl space that was insulated with spray foam insulation. But don’t insulate the crawl space yet. There is more clea
