Cellulose Or Fiberglass In Attic

You can get to the same place with either material.

Cellulose or fiberglass in attic.

Downsides of cellulose insulation. Or 7 inches of cellulose. Costs slightly more than fiberglass. 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.

Cellulose can be blown into existing walls through small access hoses without dismantling the entire wall as with fiberglass batts. The two main least expensive and most commonly used residential insulation materials is cellulose and fibreglass. Compared to fiberglass cellulose is a superb air blocker. As the temperature difference between the living space and attic increases the r value of blown fiberglass diminishes.

Blown cellulose is typically the preferred choice of insulation for 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.

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 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. Cellulose in walls and the attic also has some soundproofing properties that reduce noise transmission through the house. This keeps the air from moving within the insulation and from penetrations between the air conditioned space and the attic.

So what are the advantages and disadvantages of each of these. Fiberglass batts however are less expensive costing on average 0 30 to 0 40 a square foot for 6 inches of insulation. This is called wind washing. Unless you opt for spray foam then the insulation choices normally come down to cellulose and fibreglass.

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 forms a dense continuous mat of insulation in your attic. When walls are already finished injecting loose fill cellulose insulation is one of the few ways of adding. Rather than trying to meticulously lay fiberglass insulation over the attic homeowners and builders can simply blow cellulose insulation throughout the attic.

Since cellulose is blown in it fills all the gaps crevices nooks and crannies in your attic unlike batts that can leave gaps. 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.