How thick is r38 insulation?

The R-38 high-performance batts are 10˝ to 10-1/4˝ thick as opposed to stan- dard R-38 fiber glass insulation batts of 12˝.

Is R38 attic insulation enough?

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.

How thick is R38 in the attic?

10¼ ” thick, R-38C EcoTouch® Thermal Batt insulation prevents moisture damage and help assure long roof life by providing 1" of ventilation air space between the insulation and roof deck.

How many inches do you need for R38?

R-Values. Insulation thickness determines its thermal resistance, or R-value. The thicker the insulation, the greater the R-value. An insulation value of R-38 is at the high end and requires a minimum thickness of 12 inches.

How many inches of cellulose is R38?

For example, on one manufacturer's coverage chart, to achieve an R-38, the initially installed thickness would be 11.3 inches in depth, which will in turn settle to 10.1 inches.

Attic Insulation Options and Measuring

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.

How thick is an R38 batt?

The R-38 high-performance batts are 10˝ to 10-1/4˝ thick as opposed to stan- dard R-38 fiber glass insulation batts of 12˝.

How thick is R38 Rockwool?

x 15.5 in. x 48 in. Batts (41.33 sq ft/bag)

Can you put blown in insulation over batt insulation?

If the vapor retarder is correctly positioned, that is under the insulation directly against the ceiling, you can blow insulation over the batts. In fact, the batt and blow approach is a recommended and common technique for overcoming the endemic problems of batt installation.

How long is attic insulation good for?

Unless damaged, it can last 80 to 100 years in most houses before it needs to be replaced. However, insulation can start falling from fiberglass batts after 15 to 20 years, so if your insulation was installed in batts well over a decade ago, it might be time for an inspection or a home energy audit.

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”

Should I remove old attic insulation before adding new?

Expert contractors that specialize in insulation advise that removing old fiberglass insulation is best before installing new cellulose insulation because of possible mildew, mold, or rodent excrement.

What is the best insulation to put in your attic?

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.

Is R49 better than R38?

A ceiling with an R-value of 38 lets through only 1/38 of the amount of energy per square foot that passes through that window, or about 2.6% of the energy; a ceiling with an R-value of 49 lets through only 1/49 of the amount of energy per square foot that passes through that window, or about 2.0 % of the energy.

Should I insulate my attic floor or ceiling?

roof insulation is no-contest. The floor wins every time. Insulating the floor is standard practice for an unfinished attic space. The exception to this rule takes place when families opt to convert an unfinished attic space into something usable or livable.

What side of insulation faces out?

The first layer should have the facing against the drywall to act as a vapor barrier. (The general rule for insulation is that the facing always goes toward the conditioned space.)

Should you insulate attic roof rafters?

Insulating between rafters will do no good, because the attic should be ventilated, and the rafter insulation would be between two unheated spaces. You can add insulation to the floor; the more the merrier. Just don't put it in the eaves. Also, make sure the attic is well ventilated.

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.

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 R-value insulation do I need in a cathedral ceiling?

General principles. R-value minimums. In Climate Zones 4, 5, 6, 7, and 8, most prescriptive building codes require ceiling insulation to have a minimum R-value of R-49. In Zones 2 and 3, the minimum requirement is R-38, while in Zone 1, it's R-30.

How many inches of blown insulation is r60?

If you have approximately 6" of existing insulation, you'll need to add an additional 17" to reach R-60. If you have approximately 10" of existing insulation, you'll need to add an additional 13" to reach R-60. If you have no insulation, you'll need 23" to reach R-60.

Does fiberglass insulation lose R-value when compressed?

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.