Cellulose Vs Fiberglass Attic

Cellulose wins last update.

Cellulose vs fiberglass attic.

Cellulose has an r value of 3 5 3 7 per inch where fiberglass has around 2 1 2 7 r per inch. 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. Blown cellulose is typically the preferred choice of insulation for attics.

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. This is called wind washing. Cellulose insulation blown in wall r 3 8 r3 9.

So what are the advantages and disadvantages of each of these. The two main least expensive and most commonly used residential insulation materials is cellulose and fibreglass. Properly installed they will both remain in place for the life of the home. Both fiberglass and cellulose insulation can be installed to completely fill the space inside of wall floor or ceiling cavity.

Air moving through a vented attic deposits dirt and dust into fiberglass batts. You can get to the same place with either material. More comfortable and energy efficient. Higher r value per inch.

Fiberglass batts however are less expensive costing on average 0 30 to 0 40 a square foot for 6 inches of insulation. Cellulose insulation blown in attic r 3 6 r3 7. So it seems to me the real debate. Blown in cellulose homeowner benefits.

Since cellulose is blown in it fills all the gaps crevices nooks and crannies in your attic unlike batts that can leave gaps. Cellulose retains more of its r value through a wider range of temperatures compared to fiberglass. Both cellulose and fiberglass insulation have their pros and cons but i feel that cellulose is the better bet overall. Compared to fiberglass cellulose is a superb air blocker.