Rockwool R Value Calculator


Calculating the R-value of insulation materials is crucial for determining their effectiveness in resisting heat flow. With the Rockwool R-value calculator, you can effortlessly determine the R-value of Rockwool insulation, aiding in efficient energy management and cost savings.

How to Use

Simply input the relevant parameters such as the thickness of the insulation and its thermal conductivity. Click on the “Calculate” button to obtain the R-value. The formula used for calculation is explained below.


The R-value formula calculates the thermal resistance of an insulating material. It is defined as the ratio of the temperature difference across an insulator to the heat flux through it. Mathematically, it is expressed as:


  • R is the R-value of the insulation.
  • Thickness is the thickness of the insulation material in meters.
  • Thermal Conductivity is the measure of the ability of the material to conduct heat.

Example Solve

Suppose you have a Rockwool insulation with a thickness of 0.15 meters and a thermal conductivity of 0.035 W/mK. Using the formula:

Thus, the R-value of the Rockwool insulation is 4.29.


Q: What is the significance of R-value in insulation?
A: The R-value indicates the insulating material’s resistance to heat flow. Higher R-values imply better insulation.

Q: Why is Rockwool insulation popular?
A: Rockwool insulation is favored for its fire resistance, soundproofing qualities, and high R-value per inch.

Q: Can I use this calculator for other insulation materials?
A: This calculator is specifically designed for Rockwool insulation. Different materials may have different formulas for calculating R-value.


The Rockwool R-value calculator simplifies the process of determining the thermal resistance of Rockwool insulation, aiding in effective energy management and building insulation. By understanding the R-value, homeowners and builders can make informed decisions regarding insulation choices for enhanced comfort and energy efficiency.

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