Cellulose Blown in Attic Insulation
| R-Value | Minimum Thickness | Maximum Net Coverage per Bag |
| R44 | 13.4” | 15.1 |
| R38 | 11.6” | 18 |
| R30 | 9.3” | 23.4 |
| R19 | 6” | 40.4 |
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Hereof, how thick is r38 insulation?
Thickness of R-38 Insulation An R-38 fiberglass batt should be approximately 12 inches thick, while the thickness of cellulose insulation of a finished, fitted product will larger.
Secondly, what is the R value of 8 inches of cellulose? Like many insulation materials, it provides an R-value of approximately R-3.5 per inch of thickness.
Cellulose Insulation – A Smart Choice.
| Insulation Type | R-value per Inch of Thickness |
| Loose-fill rock wool | 2.8 |
| Loose-fill cellulose | 3.5 |
| Dense-pack cellulose | 4.0* |
| Expanded polystyrene board | 3.8 |
Similarly one may ask, how thick is r60 insulation?
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.
What is the R value of 6 inches of cellulose?
Fiber glass insulation typically contains 20% to 30% recycled glass1. The R-value of loose fill cellulose is R-3.2 to 3.8 per inch2. Loose fill fiberglass has an R-value of R-2.2 to 2.7 per inch3. Achieving the desired R-value depends on both the depth of the insulation and its density.
Related Question Answers
How thick is r38 blown insulation?
Blown in Fiberglass Attic Insulation
| R-Value | Minimum Thickness | Minimum Weight/ Sq ft |
| R49 | 19.1” | 0.774 |
| R44 | 17.4” | 0.686 |
| R38 | 15.3” | 0.583 |
| R30 | 12.4” | 0.450 |
Is r38 better than r30?
So R19 is better insulation than R13, and R30 is better than R19. The larger the R value, the better the insulation value. Most older homes have walls built with 2x4's. This means you could use R38 insulation, and then add another layer of R13, for a total of R51….again, the higher the better.How many inches deep is r30 insulation?
For future reference, here is the cavity depth you need for some common insulation r-values: 3.5 inches --- R13. 6 inches --- R19. 9 inches --- R30.How many inches thick is r30 insulation?
Typical R-30 fiberglass insulation is 10-inches-thick.How do I calculate the R value in my attic?
To find the R-value of the existing insulation in your attic, multiply the number of inches of insulation by the R-value for your particular type.How many inches of insulation should be in an attic?
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 a 2x6 wall?
The installed insulation R-value for 2x6 fiberglass batt ranges between R-19 and R-21. When blown or sprayed cellulose insulation is used, the R-value is typically R-20 for 2x6 walls.What is the R value of 12 inches of blown insulation?
An R-value is also calculated per inch of width. Therefore, a three-inch-thick board has an R-value of 3. Blown fiberglass installed in the attic has an R-value of 2.2 per inch, so 12 inches of it would give you an R-value of 26.4 in your attic installation project.Can you put too much insulation in your attic?
Without proper ventilation, a home can build up too much moisture, especially in the attic (warm air rises), which can cause mold problems and, overall, lower indoor air quality. This is not to say that if you have mold in your home, too much insulation is the culprit.How many square feet is a roll of insulation?
Guardian R-13 Kraft Faced Fiberglass Insulation Roll 15" x 32' (40 sq. ft.)How thick is r50 attic insulation?
If you believe you have R50 installed, then the depth of insulation for fibreglass is between 18-20"; if cellulose its about 14-15".What is a good R value for exterior walls?
Depending on where you live and the part of your home you're insulating (walls, crawlspace, attic, etc.), you'll need a different R-Value. Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces.Should I remove cellulose insulation?
Over time, however, cellulose insulation can settle, limiting its thermal efficiency. In such cases, the cellulose must be removed. Loose cellulose is extremely messy and dirty. To prevent the particles from contaminating the house, seal off the room in which you work and place the vacuum outside, if possible.Does cellulose insulation lose R value?
Cellulose insulation is the most prone to settling and will undergo a 20 percent loss of R-value due to settling. R-value measures the relative effectiveness of insulation per inch. Blown-in insulation made from rock wool or fiberglass typically loses between 2 and 4 percent of its insulating capacity due to settling.Which is better cellulose or foam insulation?
Cellulose is a loose-fill insulation made from chopped-up, discarded newsprint. Like spray foam, it's able to work its way into hard-to-reach areas. The benefits of cellulose include: Studies have shown it offers better fire protection than fiberglass.Does cellulose contain asbestos?
If this sounds like what you have, it is likely cellulose insulation, which contains a higher amount of recycled paper, without minerals. This means cellulose insulation does not contain asbestos and is a safe insulation, blown into the cavities.What is the R value of 1 inch Styrofoam?
• Also called Styrofoam insulation, this is the least expensive material. It provides R-values that range from 3.6 to 4.2 per inch. Some products have reinforced facing to make them sturdier.What is the R value of straw?
The reported R-value of straw bale walls varies from R 2.38 per inch to R 0.94 per inch. 
