Here is what a house looks like with NO insulation.  Icicles and potential ice dams.  We got a snow storm the day after our home performance company took out the old insulation, and then they had to wait a few days before they could put in new insulation. (Mold discovered and then remediated.)  Today they brought the big truck with a long hose and blew in cellulose insulation.  Almost done.  Hopefully, during the next storm there will be no icicles.