This keeps the air from moving within the insulation and from penetrations between the air conditioned space and the attic.
Fibreglass vs cellulose attic insulation.
The two main least expensive and most commonly used residential insulation materials is cellulose and fibreglass.
Blown in insulation requires a professional.
Fiberglass insulation blown in attic r2 2 r4 3.
Cellulose wins last update.
This allows the insulation to get into the small pockets and crevices that fiberglass wouldn t be able to.
Before choosing blown vs.
Cellulose is more difficult to cheat than fiberglass.
Cellulose and fiberglass are the two most popular types of blown insulation and they each have some pros and cons.
Cellulose is green cellulose is made of 80 post consumer recycled newsprint.
Air moving through a vented attic deposits dirt and dust into fiberglass batts.
Or 7 inches of cellulose.
Attic insulation is accomplished with either fiberglass blankets batt or blown in insulation.
Unless you opt for spray foam then the insulation choices normally come down to cellulose and fibreglass.
Because it is denser than fiberglass cellulose is much more resistant to wind washing.
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.
So what are the advantages and disadvantages of each of these.
Fiberglass insulation and cellulose insulation offer similar r values.
Both cellulose and fiberglass insulation have their pros and cons but i feel that cellulose is the better bet overall.
You can get to the same place with either material.
This is called wind washing.
Cellulose has 38 better air infiltration than fiberglass.
Here are some details on the differences between these kinds of insulation.
When used in an attic space however both types of insulation are ineffective at air flow across the attic floor such as a strong gust of wind.
Batt insulation take time to read this column.
If fiberglass batts become compressed losing some of their air pockets then this insulation may be more affected by air flow than cellulose which performs well regardless of density.
Fiberglass batt or roll insulation r3 2.
Rather than trying to meticulously lay fiberglass insulation over the attic homeowners and builders can simply blow cellulose insulation throughout the attic.
Batt insulation is available at home centers and lumberyards.
Dirty fiberglass batts have a significantly reduced r value.
Cellulose forms a dense continuous mat of insulation in your attic.
Cellulose insulates better than fiberglass especially in very cold weather.
