Cellulose insulation is also chemically treated to resist fire insects and mold.
Fiberglass insulation vs cellulose insulation for attic.
Fiberglass is a suspected carcinogen.
Thus creating a more energy efficient home.
Unless you opt for spray foam then the insulation choices normally come down to cellulose and fibreglass.
Cellulose insulation is considered green as it is made from recycled newspaper and requires less energy to manufacture than fiberglass insulation.
Or 7 inches of cellulose.
Many fiberglass installers fluff the fiber with extra air so you don t get as much insulation as you re supposed to.
This is called wind washing.
Cellulose provides better sound insulation than fiberglass i e homes are less noisy with it.
The two main least expensive and most commonly used residential insulation materials is cellulose and fibreglass.
This allows the insulation to get into the small pockets and crevices that fiberglass wouldn t be able to.
It has a better resistance to air flow and prevents the upward movement of air caused by temperature differences.
Assuming your current attic insulation is made from fiberglass and has a value of r 13 you d have to add roughly 10 inches of additional fiberglass to hit r 38.
You can get to the same place with either material.
Air moving through a vented attic deposits dirt and dust into fiberglass batts.