The bottom line is that cellulose can burn but fiberglass will not support combustion.
Is my attic insulation is cellulose or fiberglass.
Pros and cons of loose fill fiberglass attic insulation.
You can get to the same place with either material.
This keeps the air from moving within the insulation and from penetrations between the air conditioned space and the attic.
The trapped air molecules in the insulation are pulled up through the insulation into the colder attic air.
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.
If you check with the cellulose insulation manufacturers association they ll assure you that cellulose is definitely your best choice for insulation.
This problem has been successfully solved by installing fiberglass batt insulation over the top of loose fill or blown insulation.
When walls are already finished injecting loose fill cellulose insulation is one of the few ways of adding.
Lighter in weight than cellulose or mineral wool but it settles more than those materials so you ve got to put in a thicker layer to get the protection you need.
Loose fill cellulose insulation can settle around and conform to most of the obstructions found in walls and attics.
Recycled glass or sand that s melted and spun into fibers.
Or 7 inches of cellulose.
Cellulose has 38 better air infiltration than fiberglass.
Cellulose forms a dense continuous mat of insulation in your attic.