E3 - Energy and Efficiency with Emily is a podcast dedicated to energy efficient home building in cold climate areas of New England. Episode 2: Why Fiberglass Insulation Sucks. In this episode we discuss how Fiberglass insulation is almost always installed incorrectly and how that installation leads to poorly performing insulation. We also discuss a little bit about where it should be used to maximize the performance of the insulation and how it should be treated.