Can different forms of insulation be used together?
Different types of insulation can and regularly are used together. For example, if you’ve already put blown-in insulation into an attic and you feel you need more insulation, you can put down blanket rolls. The reverse is also true; blown-in insulation can supplement insulation batts. However, never put higher-density insulation over lower-density insulation, since it will reduce the total R-Value of the wall or ceiling that you’re insulating.
