Cellulose Vs Fiberglass Blown In Attic

When using cellulose blown in dry insulation it requires a machine to achieve its purpose and a training session from wherever you rent the blower from.

Cellulose vs fiberglass blown in attic.

It can still be done diy by renting a machine. Cellulose resists blowing when installed fiberglass tends to blow around stick to the attic ceiling and drift. Fiberglass insulation is the easiest insulation product on the market to install and if installed correctly the most effective product on the market for home attic insulation. As the temperature difference between the living space and attic increases the r value of blown fiberglass diminishes.

Blown fiberglass on the other hand is made up of very fine strands of glass and these tiny fibers are a carcinogen that can easily be inhaled into your lungs. Thus creating a more energy efficient home. Wet blown cellulose is also subject to similar contamination too. Loose fill blown fiberglass insulation has another slight problem.

This allows the insulation to get into the small pockets and crevices that fiberglass wouldn t be able to. Cellulose produces much less static than fiberglass. Fiberglass blown in involves using a machine to pump 2 the loose insulation into the wall cavities. Rather than trying to meticulously lay fiberglass insulation over the attic homeowners and builders can simply blow cellulose insulation throughout the attic.

Dry blown cellulose will characteristically settle and sag in place reducing its r value. You can get to the same place with either material. According to research done at the oak ridge national lab fiberglass loses up to 50 of its r value in very cold conditions. More consistent pricing from cellulose manufacturers than fiberglass.

Loose fill or blown cellulose insulation is manufactured primarily from recycled newspapers a very benign product so it poses virtually no ongoing health risk. At 3 5 per inch of material the r value of blown in cellulose is 23 better per inch than fiberglass batts. Advantages and disadvantages of fiberglass. Making cellulose a better choice for homes in northern climates.

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. Once it has settled fiberglass has an r value of 2 1 2 7 per inch while cellulose has an r value of approximately 3 0 per inch. Cellulose is easier to keep out of bird blocks and air conditioner condensate pans. Or 7 inches of cellulose.

This is slightly more difficult but provides better installation.