We have had problems in the past with ice dams forming on the roof, leading to water backing up into the walls. I know that adding insulation will help cut heat loss. There is six inches of insulation between the joists now. My dilemma:

A former owner converted my house from all electric to baseboard hot water. In order to get to all the rooms, some of the pipes run through walls up to the attic, across the tops of the joists, then down into other walls. These pipes have only thin foam pipe insulation covering them, and angles and bleeders have nothing covering them. I live in upstate New York, so in winter the heating system runs quite a lot. I would like to know if it's safe or advisable to add insulation over the hot water pipes in the attic to prevent heat loss and save on utility bills?