about 3.2 to 3.8 per inch
Cellulose is an alternative to blown-in fiberglass. It’s a fiber made from around 80 to 85 percent recycled paper. Cellulose is denser than blown-in fiberglass, so it has a better R-value — about 3.2 to 3.8 per inch, however, it does settle and flatten over time, losing some of that insulating value.
What is R-value for cellulose in attic insulation?
3.8 per inch
Thermal Properties
| Cellulose Insulation | Loose Fill Fiberglass #2 | |
|---|---|---|
| R-value | 3.8 per inch | 2.7 per inch |
| Design Density | 25.6 kg/m3 | 8.0 kg/m3 |
How many inches of blown cellulose insulation is R38?
Cellulose Chart
| R-Value | Min Thickness | Bags / 1000 Sq Ft |
|---|---|---|
| R44 | 13.4” | 66.2 |
| R38 | 11.6” | 55.5 |
| R30 | 9.3” | 42.7 |
| R19 | 6” | 24.8 |
What R-value is cellulose in walls?
approximately R-3.5 per inch
Cellulose is not unusual in this regard. Like many insulation materials, it provides an R-value of approximately R-3.5 per inch of thickness. But, air leakage through cracks, voids, and gaps is important, responsible for approximately one-third of an average home’s heat loss. Cellulose is a superb air-blocker.
Does cellulose insulation lose R-value?
As a loose-fill insulation, cellulose provides high insulating values, represented by its higher R-value, and it creates a good barrier against air leaks and infiltration. However, like other loose fill insulation, it also has a tendency to settle over time, reducing its R-value and its ability to prevent air movement.
Is blown-in cellulose insulation good?
At 3.5 per inch of material, the R-value of blown-in cellulose is 23% better per inch than fiberglass batts! According to research done at the Oak Ridge National Lab, fiberglass loses up to 50% of its R-value in very cold conditions; making cellulose a better choice for homes in northern climates.
What is the R-value of 10 inches of blown insulation?
| R-value of Materials and Depths | ||
|---|---|---|
| Material | R-value/in | 10″ |
| Mineral Wool blown (wall) | 3.1 – 4.0 | 31.0 – 40.0 |
| Cellulose blown (attic) | 3.2 – 3.7 | 32.0 – 37.0 |
| Cellulose blown (wall) | 3.8 – 3.9 | 38.0 – 39.0 |
What is the R-value per inch of cellulose insulation?
R-3.2 to 3.8 per inch2
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. Depending on your climate, energy codes require varying R-values for ceiling insulation.
How many inches is R60 cellulose insulation?
The average recommended level is 17 inches of R60.
How long does blown-in cellulose insulation last?
20 to 30 years
Because it is made primarily of recycled materials, however, cellulose insulation does degrade over time. The typical lifespan is 20 to 30 years, with degradation beginning as early as 15 years after installation. As with other types of insulation, severe weather or outside interference can reduce the lifespan.
What is the are value per inch of blown in insulation?
Note that the R-value of blown-in cellulose insulation is high at 3.5 per inch of thickness. This means that a fully compacted 6 inches blown-in cellulose insulation in an unfinished attic would have an R-value of 21. Cellulose insulation , being made of fiber, is susceptible to rot when exposed to moisture.
What are the dangers of cellulose insulation?
Cellulose insulation presents some serious health hazards; for example, it sprinkles fibers and dusts all over the living spaces, it includes some very irritating substances like borates and sulfates, and finally, it may also carry potential cancer causing agents or carcinogens.
Why to use cellulose insulation?
Yet another reason why use cellulose insulation. Cellulose controls sound. Not only is cellulose a great product for insulating your home, shop or barn attic, its also great at reducing sound. STC is a number rating of a material’s ability to resist airborne sound transfer.
How long does blown in cellulose insulation last?
Generally, when answering the question of how well blown in cellulose insulation lasts, estimates will vary depending on the age of your home, but the International Association of Certified Home Inspectors states that blown in cellulose insulation could last up to 100 years!
