Fiberglass Insulation Vs Cellulose Insulation For Attic

It has a better resistance to air flow and prevents the upward movement of air caused by temperature differences.

Fiberglass insulation vs cellulose insulation for attic.

Cellulose insulation is considered green as it is made from recycled newspaper and requires less energy to manufacture than fiberglass insulation. This is called wind washing. Or 7 inches of cellulose. Thus creating a more energy efficient home.

Because it is denser than fiberglass cellulose is much more resistant to wind washing. Cellulose provides better sound insulation than fiberglass i e homes are less noisy with it. Many fiberglass installers fluff the fiber with extra air so you don t get as much insulation as you re supposed to. You can get to the same place with either material.

Dirty fiberglass batts have a significantly reduced r value. Air moving through a vented attic deposits dirt and dust into fiberglass batts. Cellulose insulation is also chemically treated to resist fire insects and mold. The two main least expensive and most commonly used residential insulation materials is cellulose and fibreglass.

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. Fiberglass is a suspected carcinogen.