What Insulation Has The Highest R Value?

Vacuum insulated panels

have the highest R-value, approximately R-45 (in U.S. units) per inch; aerogel has the next highest R-value (about R-10 to R-30 per inch), followed by polyurethane (PUR) and phenolic foam insulations with R-7 per inch.

What insulation has the highest R-value per inch?

Open-cell spray foam

is rated at about R-3.5 per inch while closed-cell spray foam is much more efficient at R-6.0 to R-6.5 per inch. Consider spray foam anywhere you need an air barrier as well as insulation.

What is the best R-value for insulation?

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.

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.

Is a higher R-value better?

R-Values. An insulating material’s resistance to conductive heat flow is measured or rated in terms of its thermal resistance or R-value — the higher the R-value, the

greater the insulating effectiveness

.

What is the thinnest most effective insulation?

OPTIM-R

is Kingspan’s thinnest insulation. It comprises of a rigid vacuum insulation panel (VIP) with a micro porous core which is evacuated, encased and sealed in a thin, gas-tight envelope which gives an outstanding thermal conductivity of 0.007 W/m.K.

Can you over insulate a house?

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.

What is the R-value of 4 inch rigid insulation?

This product typically has an R value of

3.6 to 4.0 per inch of thickness

.

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

Decode the R-values

The number is presented per inch, so an R-value of

3.1

at 12 inches would provide an overall value of R-38.

What is the R-value of 1 inch wood?

The R-value for wood ranges between

1.41 per inch

(2.54 cm) for most softwoods and 0.71 for most hardwoods.

What is the most cost effective home insulation?

Attic insulation

is one of the least expensive options, and among the most effective for heat retention. Choosing attic insulation means that you’ll have to decide whether to insulate the floor or the roof, with the latter of the two ensuring that your attic space will still be usable.

What is R 13 insulation?

R13

fiberglass batt insulation

, typically used in walls and floors, is 3 5/8 inches thick, according to Energy.gov. Insulation needs and the effectiveness of the insulation vary depending on climate and material.

Is R-21 better than R19?

Upgrading to R-21

R-21 insulation has

a higher density than R-19

, although it is designed to fit into the same space. It tends to be slightly thinner than R-19 because of its density. … R-21 insulation is more efficient at preventing the transfer of heat, but it costs more per square foot.

Is R30 better than R19?

Inside your home, the warmer air is higher pressure air, and wants to move, or transfer to lower pressure, cooler air outside. Insulation in your walls and ceilings slows down this 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 R value should my walls be?

Which type of insulation is most effective?

Fiberglass

is the most common insulation used in modern times. Because of how it is made, by effectively weaving fine strands of glass into an insulation material, fiberglass is able to minimize heat transfer.