# Quick Answer: What Is The R Value Of Soil?

## What material has the highest R value?

R-value (insulation)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.

Straw bales perform at about R-1.5 per inch.More items….

## What is the R value for air?

The value of R depends on the units involved, but is usually stated with S.I. units as: R = 8.314 J/mol·K. This means that for air, you can use the value R = 287 J/kg·K.

## Does Tyvek have an R value?

Do Tyvek® weather barriers have an R-value? No; however, properly installed Tyvek® weather barriers help protect against loss of R-value in insulation due to wind washing.

## What is the highest rated insulation?

FiberglassFiberglass: Available in batts, blankets, rolls and loose-fill, fiberglass is the most ubiquitous insulation material in use today. However, it offers relatively low R-values spanning R-3.1 to R-4.3 per inch. Fiberglass is usually installed between studs, joists and rafters in unfinished walls, floors and ceilings.

## What is the R value of a material?

In construction, the R-value is the measurement of a material’s capacity to resist heat flow from one side to the other. In simple terms, R-values measure the effectiveness of insulation and a higher number represents more effective insulation.

## What is R value in pavement design?

R-value tests are used to evaluate the capacity of a soil for supporting overlying layers of soil, crushed aggregate and pavement. The R-value test output is a number ranging from 0 to 100, with 0 representing a viscous liquid slurry with no shear resistance, and 100 representing a rigid solid.

## What is the thinnest insulation with the highest R value?

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.

## What is the R value of 7/16 OSB?

0.517/16” OSB R-Value = 0.51.

## What is the R value of 1 inch Styrofoam?

Extruded polystyrene foam (XPS) also known as blue board or pink board comes in many different thicknesses and edge profiles. This insulation board is probably one of the most widely used foam board insulation products in the residential construction industry. XPS has an R value of 4.5 to 5.0 per inch of thickness.