Quick Answer: What Is The R Value Of 12 Inches Of Blown Insulation?

What is the thinnest insulation with the 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..

How much better is r38 vs r30 insulation?

Example: R38 has a U of 1/R or 1/38=. 026 and R30 has a U of 1/30=. 033. So R38 is about 20% better.

What is the R value of 8 inches of cellulose?

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 is the best R factor for insulation?

Recommended insulation levels for retrofitting existing wood-framed buildingsZoneAdd Insulation to AtticUninsulated AtticExisting 3–4 Inches of Insulation1R30 to R49R25 to R302R30 to R60R25 to R383R30 to R60R25 to R383 more rows

How thick is r30 insulation?

10-inchesTypical 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.

How dangerous is insulation?

Dangers from Exposed Insulation Skin irritation – Fiberglass is a skin irritant. Even if you are not touching the insulation, it can send particles into the air that can irritate the skin. Lung irritation – Even more concerning, fiberglass, if breathed, will irritate the lungs, creating serious respiratory risks.

What is the R value of 1 inch Styrofoam?

3.6 to 4.2 per inchAlso 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.

Can you put too much insulation in your attic?

There’s really no such thing as “too much insulation.” It is more likely that your attic is not ventilating properly, resulting in warmer air on the 2nd floor and an overheated attic.

What is a good 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. See the Department of Energy’s (DOE) ranges for recommended levels of insulation below.

How many inches of blown insulation is r30?

Cellulose ChartR-ValueMin ThicknessBags / 1000 Sq FtR4915”75.2R4413.4”66.2R3811.6”55.5R309.3”42.71 more row

How thick is r60 blown fiberglass 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.

Which is better blown in insulation or rolled?

The environmentalists in your family will likely favor it over the rolled kind of fiberglass insulation. Blown fiberglass insulation scores an R-value of 3.2 to 3.8, making it slightly less likely than rolled fiberglass to prevent the flow of heat into and out of your house.

What is better spray foam or cellulose?

Spray foam is the better choice when it comes to long-term cost and thermal resistance. If you prefer using safer and eco-friendly materials that offer good sound control at an affordable price point, then you may prefer cellulose insulation.

How many inches of blown insulation do I need?

Average Cost of Blown-In Fiberglass InsulationR-ValueBags Per 1,000 Sq. Ft.Installed Thickness (Inches)R-301510.25R-382013R-442314.75R-492616.51 more row

How do I know if my insulation is blown?

Example Calculation = 12 Area = 10 * 6 = 60 square ft Required depth to achieve R value needed = R 12 / R 3.6 = 3.3 inches Volume needed = 60sq ft * 0.275 (3.3 /12 converting to decimal ft) = 16.5 cubic feet You would need one bag in this case. Note: the cost is based on rounding up the number of bags needed.

What type of insulation is best for attic?

Loose-fill fiberglass attic insulation still experiences convection, but not nearly as much as old fiberglass used to. If you check with the North American Insulation Manufacturers Association, they’ll assure you that fiberglass or mineral wool is definitely your best choice for attic insulation.

How thick is r50 blown insulation?

Here is the recommended thickness for the insulation of the penthouses based on the R Value: R 40: Thickness that oscillates between 13 and 15 inches. R 50: Thickness that oscillates between 15 and 19 inches. R 60: Thickness that oscillates between 19 and 22 inches.

What is the R value of 12 inches of fiberglass insulation?

26.4Blown 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.

How many inches of blown insulation should be 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 type of insulation is best?

Closed cell foam has the highest R-value of any insulation, around R-6.2 per inch, but can be expensive; open-cell foam insulation values are around R-3.7 per inch of thickness.

What is the R value of blown insulation?

R-Value of Insulation by Type Fiberglass (blown): 2.2 – 2.9. Fiberglass (batts): 2.9 – 3.8. Cellulose (blown): 3.1 – 3.8. Rock Wool (loose): 2.2 – 3.3.