Fiberglass Insulation Cost While insulation costs can vary depending on which material you choose for your home insulation, fiberglass is by far the most popular choice for attic insulation material compared to cellulose, mineral wool, or spray foam insulation. Aside from this insulation type being significantly more effective in energy savings when comparing it to foam insulation, the most convincing argument for choosing fiberglass is a simple one: it’s a fantastic product that you can buy for an irresistibly inexpensive…