I have hanging or fallen insulation, does it need to be replaced?

This depends on whether the insulation has become wet or moldy. If the insulation is dry it can often be rehung or a damaged portion can be replaced. If your insulation is wet, moldy or a low R-value, it should be replaced.  Current NC code specifies R19 insulation. If your home is older it may have R11 between floor joists and we recommend upgrading to R19 for maximum efficiency.