Cellulose Or Fiberglass In Attic

As the temperature difference between the living space and attic increases the r value of blown fiberglass diminishes.

Cellulose or fiberglass in attic.

You can get to the same place with either material. So what are the advantages and disadvantages of each of these. Since cellulose is blown in it fills all the gaps crevices nooks and crannies in your attic unlike batts that can leave gaps. This is called wind washing.

The two main least expensive and most commonly used residential insulation materials is cellulose and fibreglass. Loose fill blown fiberglass insulation has another slight problem. Or 7 inches of cellulose. This keeps the air from moving within the insulation and from penetrations between the air conditioned space and the attic.

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. Fiberglass batts however are less expensive costing on average 0 30 to 0 40 a square foot for 6 inches of insulation. Rather than trying to meticulously lay fiberglass insulation over the attic homeowners and builders can simply blow cellulose insulation throughout the attic. Costs slightly more than fiberglass.

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. Loose fill cellulose is relatively inexpensive yet still has an r value of about 3 5 per inch of thickness compared to fiberglass r value between r3 to r4 per inch. Downsides of cellulose insulation. Blown cellulose is typically the preferred choice of insulation for attics.

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. When comparing blown in insulation both fiberglass and cellulose are nearly identical in price both costing around 0 70 to 0 80 per square foot for 6 inches of insulation. Cellulose in walls and the attic also has some soundproofing properties that reduce noise transmission through the house. Compared to fiberglass cellulose is a superb air blocker.

Unless you opt for spray foam then the insulation choices normally come down to cellulose and fibreglass. Loose fill cellulose insulation can settle around and conform to most of the obstructions found in walls and attics. Cellulose has 38 better air infiltration than fiberglass. Cellulose is more difficult to cheat than fiberglass.

Air moving through a vented attic deposits dirt and dust into fiberglass batts. Cellulose forms a dense continuous mat of insulation in your attic.