What Does Wet Insulation Look Like? 

Wet insulation is pretty easy to identify. First of all, look for visible water droplets on the surface of the insulation. Obviously, this is a clear indication that it is wet. However, sometimes the moisture seeps into the insulation material. When this happens, you might notice sagging or collapsed sections of damp insulation hanging from the top of your crawl space. Also, look out for any sections of insulation that might be on the ground of your crawl space. Moisture makes the insulation heavier, so this is a likely sign that the insulation is wet.