When it comes to insulating your home, there are two commonly used materials to do the job, fiberglass and cellulose. Both materials improve the energy efficiency of your home but do so in different ways. R-Value R-values refer to how well an insulation performs at blocking thermal transfer. The higher the R-value, the better the insulation performs. Fiberglass and cellulose have similar R-values, with ranges depending on how and where they are installed. Because fiberglass comes in batts or blown-in insulation and both materials can be loosely or densely installed, this can change …