What is the R-value per inch of cellulose insulation?
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.
What R-value is 12 inches of cellulose?
Decode the R-values
The number is presented per inch, so an R-value of 3.1 at 12 inches would provide an overall value of R-38.
What is the R-value of blown-in cellulose insulation?
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.
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.
How many inches is R49 cellulose?
The average R-value of blown-in rock wool insulation is 3 per inch. Therefore, it will take 16 inches of thickness for this insulation material to be rated R49.
Understanding Insulation and R-Value | Ask This Old House
How deep should cellulose insulation be in attic?
Cellulose insulation should be 8-19 inches deep in your attic. Generally, the proper depth of cellulose depends on the following factors: Desired R-value. Insulation density.
What insulation has the highest R-value per inch?
Vacuum insulated panels have the highest R-value, approximately R-45 (in U.S. units) per inch; aerogel has the next highest R-value (about R-10 to R-30 per inch), followed by polyurethane (PUR) and phenolic foam insulations with R-7 per inch.
How long will cellulose insulation last?
Cellulose Insulation--Made from recycled paper, this insulation does a spectacular job of keeping the house temperature controlled. With a lifespan that can last up to 30 years, it's a green and effective choice.
Why is cellulose insulation bad?
Cellulose insulation is safe. It is made of paper, but the chemical treatment provides it with permanent fire resistance. There's been static generated by the fiberglass industry warning that cellulose could burn. But independent testing confirms it's safe and cellulose is approved by all building codes.
Does cellulose insulation need a vapor barrier?
Air / Vapor Barrier
A common misconception is that vapor barriers are required in all insulation installations. With Modern's Cellulose insulation, a vapor barrier is not recommended except in very cold weather or high moisture areas such as spas or pool buildings.
Which is better cellulose or fiberglass blown in insulation?
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.
How thick is r30 insulation?
Typical R-30 fiberglass insulation is 10-inches-thick. Prior to buying fiberglass insulation, it is important to measure the joint spacing you are working with. Note that the actual space between the framing members will be less than 16 or 24 inches, but the foam batts can easily be stuffed between these lengths.
What is the best R-value for 2x4 walls?
Insulation for 2x4 Walls
In most wall applications, you will use R-13 or R-15 kraft-faced fiberglass insulation rolls for these two-by-four stud walls. While rated differently, these two types of insulation are close enough in thickness that they can both fit into modern two-by-four wall systems.
What is the thinnest insulation with highest R-value?
Aerogel insulation offers the highest R-value of any insulating material at less weight and thickness—ideal for construction, refineries, pipelines, and thin-gap thermal barriers.
What is the R-value of 14 inches of blown insulation?
Cold Climates (R-49 to R-60):
Fiberglass (batts): 14” – 19” Cellulose (blown): 14” – 18” Rock Wool (loose): 17” – 25”
What is the R-value of Dow blue board?
DuPont™ STYROFOAM™ Scoreboard Insulation Board (Blue Board) 4 ft by 8 ft Sheet, 1.5" Thick, R value 7.5 A nonstructural, rigid board insulation manufactured of Extruded Polystyrene Foam (XPS).
How many inches of insulation is R60?
The average recommended level is 17 inches of R60. In Zone 3, the average minimum requirement for attic insulation is 9 inches of R30 fill.
Which blown insulation is best?
Fiberglass, cotton, and mineral wool can all work as loose-fill material, but the far and away top choice for blown-in insulation is fiberglass. Contrary to batts insulation, blown-in fiberglass insulation is perfect for filling in tight voids around wiring, pipes, or any area with awkward framing.
Can you put too much insulation in your attic?
It's possible to over-insulate an attic as too much will cause moisture buildup and eventually result in mold. Eventually, adding more insulation leads to diminishing returns in trapping heat as well.
What R-value should I have in my attic?
R-Value is a measure of insulation's ability to resist heat flow. 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 12 inches of loose fill fiberglass insulation?
Loose-fill fiberglass: R-2.5 per inch (12-20 inches thick for an attic) Cellulose: R-3.7 per inch (9-14 inches thick for an attic)
Is r49 insulation good for attic?
R-49 will do a good job of protecting your ceilings from the extreme inferno-like temperatures of 130-140 degrees in your attic.