What Is The Insulation In Your Attic Made Of? The two most popular types of insulation that are in your homes are fiberglass and cellulose fiber.
In my house, we use fiberglass batts. Fiberglass comes from glass that has been crushed and packed into these things called batts.
Fiberglass insulation can come in loose-fill (what you can get at the hardware store) or blown-in material. Blown-in materials are usually contracted out to a professional. Batts of insulation are rolled up blankets of insulation that you install in between the beams in the attic. They are flexible products made from mineral fibers, such as fiberglass and rock wool.
Cellulose Fiber Insulation
Cellulose fiber is a whole other type of material. Cellulose consists of ground-up newspaper material, which is then treated with fire-retardant chemicals. It can get into any nook or cranny. This makes cellulose the better, more complete insulation. Cellulose fiber insulation is also less subject than open fiberglass to what builders call "wind wash," which is simply air currents moving through insulation, robbing it of its R-value. Source: US Department of Energy, Energy Saving Tips: Insulation.
Green Guard Label
Most insulation that I have seen in stores carry the Green Guard label. This label certifies that the formaldehyde levels are less than 0.5 parts per million (ppm) of particles in the air.
That is pretty clean.
What Type of Insulation Is Better? Green Guard and Green Insulation All forms of attic insulation are great: fiberglass vs cellulose