How much cellulose insulation do I need in my attic?
The higher the R-Value, the better the thermal performance of the insulation. The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.
What is the R-value of 6 inches of cellulose?
Damp-sprayed loose-fill cellulose insulation has an R-value of up to 3.7 per inch, and it also has superior sealing characteristics. A 6-inch wall cavity that’s insulated with loose-fill cellulose is expected to reach a total R-value of 22.
What R-value is 12 inches of cellulose?
| R-value of Materials and Depths | ||
|---|---|---|
| Material | R-value/in | 12″ |
| Cellulose blown (attic) | 3.2 – 3.7 | 38.4 – 44.4 |
| Cellulose blown (wall) | 3.8 – 3.9 | 45.6 – 46.8 |
| Polystrene Board | 3.8 – 5.0 | 45.6 – 60.0 |
How much cellulose should I put in my attic?
In temperate coastal areas such as Zone 3, attic insulation of at least R30 up to a maximum of R60 is recommended. For loose-fill cellulose, this translates to a total depth ranging from 8 inches up to 16 inches. Fortunately, attic insulation can be upgraded simply by adding more to achieve the recommended total depth in inches,…
How to determine the amount of cellulose insulation needed for a house?
The cellulose insulation needs to be at a weight of 2 1/2 to 4 pounds per cubic foot. Determine this by multiplying the weight number of the insulation by the total cubic footage.
How big is a 30 lb insulation bag?
* 30lb. bag dimension = 14” x 15” x 28” long or 3.4 cu./ft. per bag Loose Fill Attics: R-30, 10.5” deep, (33lb./bg) = 13 bags Dense pack walls: R-13, 2” x 4” wall, (33lb./bg) = 13 bags Dense pack walls: R-21, 2” x 6” walls, (33lb./bg) = 21 bags * 33 lb. bag dimension = 8”x 20”x 38” long or 3.5 cu./ft. per bag
Can you install cellulose insulation without a blowing machine?
Since cellulose insulation is compressively packaged you cannot install it without using a blowing machine. I do not recommend trying to do this by hand. “A few bags” may not qualify you for loan of a machine, but you can certainly rent one from a big box home center or an equiment rental service.