Fiberglass Insulation Vs Cellulose Insulation For Attic

Or 7 inches of cellulose.

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. Dirty fiberglass batts have a significantly reduced r value. Thus creating a more energy efficient home. Cellulose provides better sound insulation than fiberglass i e homes are less noisy with it.

You can get to the same place with either material. Cellulose insulation is considered green as it is made from recycled newspaper and requires less energy to manufacture than fiberglass insulation. Because it is denser than fiberglass cellulose is much more resistant to wind washing. The two main least expensive and most commonly used residential insulation materials is cellulose and fibreglass.

Rather than trying to meticulously lay fiberglass insulation over the attic homeowners and builders can simply blow cellulose insulation throughout the attic. 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. 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.

Fiberglass is a suspected carcinogen. Unless you opt for spray foam then the insulation choices normally come down to cellulose and fibreglass.