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What is R11 insulation good for?

What is R11 insulation good for?

The Johns Manville R-11 Kraft-Faced Fiberglass Insulation Batt is a revolutionary insulating material that is ideal for controlling moisture of exterior walls. It is available in pre-cut sizes that make them suitable to fit in different types of standard wall cavities.

Which R-value insulation is best?

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.

What is a good R-value for an attic?


Exterior walls, for example, are recommended to have an Insulation R-Value of at least R-40, while ceilings and attic spaces will need a higher R-Value which with new recommendations, goes up to R-60.

What is the R-value of 4 inch insulation?

That means that 4-inch EPS has an insulation R-value of R-16.8.

Is R11 insulation good for soundproofing?

Overall, R11 does an excellent job with soundproofing. The unfaced batts are formaldehyde-free fiberglass for sound control.

Is R15 better than R11?

Applications. R-11 has about 73 percent of the insulative efficiency of R-15 when comparing two of the materials. This doesn’t mean that one house insulated with R-11 will have 73 percent less insulative properties than a house insulated with R-15. The houses may be very different.

Which insulation is best for walls?

The best insulation for walls when it comes to new build homes or remodels is going to be Nu-Wool, foam board, or open cell spray foam.


  • Open cell spray foam is an expensive option for insulation.
  • Spray foam can’t be installed as a DIY project.
  • Some brands of spray foam have an odor when installed.

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

Fiberglass and rock wool batts—2×4 walls can hold R-13 or R-15 batts; 2×6 walls can have R-19 or R-21 products.

What insulation is best for attic?

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.

Does insulation lose R-value over time?

Yes. Cellulose insulation does lose its R-value when it is compressed. The amount of loss depends on how much insulation is decompressed but typically ranges anywhere from 15% to 20% of its initial value.

Does doubling insulation Double R-value?

Doubling the thickness of insulation will double the insulation’s R-value, cutting heat loss in half. Each time the insulation layer is doubled in thickness, this rule applies.

What is the R-value of 4 inch fiberglass?

What is the R-value of 4-inch fiberglass insulation? For batt insulation, the R-value of 4 inches thickness is between 12.4-13.6. For loose-fill insulations for attics, the R-value is between 8.8-and 17.2. For loose-fill insulation for walls, the R-value is between 14.8-and 17.2.

Is R11 or R13 better for sound?

Is R11 or R13 Better for Sound? R11 is better for sound. It reduces noise in a 2×4 wall more than any other fiberglass insulation product.

What R-value insulation do I need for soundproofing?

While soundproofing your room, you might want to include R-13 insulation in the walls and R-19 in the ceilings. You can use cut-to-size batts which match the standard joist and drywall measurements.

What insulation is best for soundproofing?

Fiberglass is undoubtedly the most effective, versatile insulation for soundproofing. Between fiberglass, mineral wool, and cellulose insulation, fiberglass consistently has the highest STL, Sound Transmission Class rating.

Is it better to insulate walls from outside or inside?

Interior insulation is cost effective, but can reduce usable space and doesn’t protect against water. Exterior insulation is expensive and susceptible to insects. Regardless of the insulation choice, efficiency, toxicity and resiliency must all be taken into account as well.

Can you put r19 in a 2×4 wall?

When you are insulating two-by-four (2×4) and two-by-six (2×6) framed exterior walls and want to use fiberglass insulation, what thickness is best?
Insulation for 2×6 Walls.

Best Insulation for 2×4 and 2×6 Wall Studs
R-19 6 1/4 Inches (+/-) Two-by-six (2×6) stud walls

How thick of insulation can you put in a 2×4 wall?

Cavity insulation, like framing, has options. A 2×4 wall cavity can be insulated from R-13 to roughly R-25. A 2×6 wall can be insulated from R-19 to R-39.

Can you over insulate an attic?

Can you over insulate your attic? The answer is yes! Past a certain point, insulation in a vented attic will do more harm than good. In most of the United States, achieving an R-Value of 38 is more than sufficient.

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.

Do I need to remove old insulation before installing new?

Why remove attic insulation? 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.

Is new insulation better than old?

Fiberglass insulation typically needs to be replaced 15-20 years into it’s life, as it can easily become dirty, wet, moldy, and ineffective if there’s a roof leak or water damage of any kind.

Can you put too much insulation in walls?

It is possible to over-insulate your house so much that it can’t breathe. The whole point of home insulation is to tightly seal your home’s interior. But if it becomes too tightly sealed with too many layers of insulation, moisture can get trapped inside those layers. That’s when mold starts to grow.

Can you put too much insulation in an 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 is the R-value of Styrofoam vs fiberglass?

Closed-cell spray foam has an R-value of roughly 6.5 per inch while open-cell spray foam has an R-value of 3.5 per inch. The R-value of fiberglass is significantly lower at around 2.2 per inch. In addition, fiberglass insulation loses R-value over time while spray foam insulation maintains its effectiveness.