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##### Asked by: Adinath Lubutov

home and garden indoor environmental quality# What is the unit of R value?

Last Updated: 27th March, 2020

**R**-

**Value**is an imperial system

**unit**of measurement (ft

^{2}·°F·h/BTU) and the RSI

**Value**is a metric system

**unit**of measurement (m

^{2}·K/W). The higher the resistance

**value**, the slower the rate of heat transfer through the insulating material.

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Thereof, what is R value and K value?

**R**-**Value**. The thicker the **insulation** is, the greater the **R**-**Value**. **K**-**Value** on the other hand is the measure of heat conductivity of **insulation**.

Additionally, what is the R value of wood? 1.41 per inch

Subsequently, question is, what is the R value of 1/2 inch plywood?

R-Value Table - English (US) Units

Material | R/ Inch hr·ft2·°F/Btu | R/ Thickness hr·ft2·°F/Btu |
---|---|---|

Plywood | 1.25 | |

1/4" | 0.31 | |

3/8" | 0.47 | |

1/2" | 0.63 |

What is K value?

A **k**-**value** (sometimes referred to as a **k**-factor or lambda **value** λ) is a measure of the thermal conductivity of a material, that is, how easily heat passes across it. Typically this is important in assessing the potential for heat transfer between the inside and outside of a building.