Quick Answer: What Is The Difference Between R19 And R30 Insulation?

What is R 19 insulation used for?

Both R-19 and R-21 insulation are commonly used to insulate walls of homes framed with 2-by-6 lumber, and each are recommended by U.S.

Department of Energy to efficiently insulate new construction..

What does R 30 insulation mean?

Essentially R-value is a measure of thermal resistance, or the ability to prevent the transfer of heat. The larger the number, the harder that insulation is working at preventing heat conduction. The less heat loss, the lower your energy bills. … The standard R-value for roofs is R-30 or R-40.

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.

Which insulation is best?

When it comes to the best insulation for walls, the insulation material can also impact the R-values needed for good energy efficiency. Fiberglass: Fiberglass is the most common insulation material. It’s made from fine glass fibers and is most often used in batts, rolls and loose-fill 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.

Can you use r19 insulation in attic?

Most homes only have R19 in attics. To give you an idea that’s only 5 1/2 inches of insulation. That’s ok for your walls. … So by adding another R19 “5 1/2 inches will give you an R38 value.

How many inches of insulation 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.

How many inches of insulation should you have in your 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 is the best insulation for an 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.

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. … Lots of attic insulation will keep the 2nd floor temperature from changing quickly.

Is it better to insulate attic ceiling or floor?

1 Answer. Since the ceiling in the attic is too low to make it into a living space, you should only insulate the floor. Insulating the ceiling will create a new heating zone, and essentially you will be paying more to heat your attic.

How much does it cost to insulate a 1500 sq ft attic?

Attic Insulation CostsItemUnit CostCostInsulation: install Kraft faced R-19, 23″ wide x 6.25″ thick x 1,500 sq.ft.; prepare and clean up; including waste and miscellaneous material.$0.64$1,053+ Labor Cost$32$448Total Cost$1.00$1,501