How many inches thick is r30 insulation?

Typical R-30 fiberglass insulation is 10-inches-thick.

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 R 19 insulation thickness? When you compress fiber glass batt insulation, the R-value per inch goes up, but the overall R-value goes down because you have less inches or thickness of insulation. The standard R19 fiberglass batt is 6.25″ thick.

Also to know, how thick is r30 insulation?

8¼ ” thick, R-30C EcoTouch® Thermal Batt insulation prevents moisture damage and helps assure long roof life by providing 1″ of ventilation air space between the insulation and roof deck.

What is the thickness of r25 insulation?


Series Name N/A
Length (Inches) 96
Thickness (Inches) 8
Coverage Area (Sq. Feet) 64
Package Quantity 6

Can you put too much insulation in your attic?

But there may be a theoretical point of “too much.” If a home is over-insulated and is too tightly sealed, moisture can get trapped inside. 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.

How thick should insulation be?

The insulation in your attic should be at least 12″ thick. The thicker the better. It is not uncommon to see 15″ to 20″ of insulation in a well insulated attic. If your attic insulation is only a few inches thick or if you can see the ceiling joists, you’re wasting money on your heating and cooling bills.

How deep is r30?

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.

What should the R value be for exterior walls?

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 is r49 insulation?

Blown in Fiberglass Attic Insulation R-Value Minimum Thickness Bags per 1000 sq ft of net area R49 19.1” 30.4 R44 17.4” 26.9 R38 15.3” 22.9 R30 12.4” 17.6

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.

Can you use r30 insulation in walls?

Heat rises hence the thicker insulation in the ceiling. But you can also lose heat through a wall, so the more insulation you have the better. If you have R50 in the ceiling and you have R30 in the walls, you could probably heat the area with a match!!!

Does doubling the insulation increase the R value?

Doubling the thickness of insulation will double the insulation’s R-value, cutting heat loss in half. The energy saved per year by doubling insulation from R-10 to R-20, however, will be considerably more than the energy saved by doubling insulation from R-20 to R-40, because of the law of diminishing returns.

What is the thickness of R 38 insulation?

Thickness of R-38 Insulation The fiberglass comes in rolls, also known as batts, which vary in size. An R-38 fiberglass batt should be approximately 12 inches thick, while the thickness of cellulose insulation of a finished, fitted product will larger.

How thick is r11 insulation?

Fiberglass Batt Insulation Characteristics Thickness (inches) R-Value Cost (cents/sq. ft.) 3 1/2 11 12-16 3 5/8 13 15-20 3 1/2 (high density) 15 34-40 6 to 6 1/4 19 27-34

What happens if you compress batt insulation?

When you compress fiberglass insulation, you increase its R-value per inch, up to a point. However, when you compress a batt of a particular thickness, the total R-value does decrease. If you compress a 6-inch R-19 batt into a 3 1/2-inch cavity, you get about R-14, or 4.0 per inch.

How much better is r38 vs r30 insulation?

There is a direct relationship between the amount of insulation and the amount of heat transfer. The bigger the R value, the better the insulation is at slowing down the heat transfer. So R19 is better insulation than R13, and R30 is better than R19. The larger the R value, the better the insulation value.

What is the thickness of r21 insulation?

Maximum R-Value at Lower Costs R-21 EcoTouch® insulation is designed to eliminate R-value loss caused by compressing standard R-19 Fiberglas™ insulation into 2×6 exterior walls. 5½ ” thick R-21 EcoTouch® insulation delivers 19% more R-value than compressed 6¼ ” R-19 Fiberglas™ insulation.

What is the highest R value for a 2×4 wall?

Fiberglass vats are the standard insulator for 2-inch by 4-inch wall framing, and are rated R-11 through R-15. In order to achieve the higher insulation R-value of R-21 a different type of insulation will be required.