Rockwool Insulation U-Value Calculator
Rockwool insulation’s U-value is a crucial factor in energy-efficient building design. Our calculator helps you determine this value, ensuring optimal insulation performance.
- Enter the thickness, density, and temperature of your Rockwool insulation.
- Click ‘Calculate’.
- View your results and chart below.
The U-value is calculated using the formula: U = 1 / (λ * t), where λ is the thermal conductivity (W/mK) and t is the thickness (m). Our calculator uses Rockwool’s thermal conductivity data to provide accurate results.
| Thickness (mm) | Density (kg/m³) | Temperature (°C) | U-Value (W/m²K) |
|---|---|---|---|
| 50 | 120 | 20 | 0.035 |
| Insulation Type | U-Value (W/m²K) |
|---|---|
| Rockwool | 0.035 – 0.045 |
| Fiberglass | 0.038 – 0.048 |
- Consider using Rockwool’s high-density products for better U-values.
- Ensure proper installation to maintain the calculated U-value.
What is the U-value?
The U-value, or thermal transmittance, is a measure of heat transfer through a building element, such as a wall or roof.
Learn more about insulation U-values from the U.S. Department of Energy
Understand thermal bridges with this guide from Building Science Corporation