Rockwool Online U-Value Calculator
Rockwool’s U-Value is a crucial factor in determining the thermal performance of your insulation. Our online calculator helps you calculate it effortlessly.
- Enter the thickness of your Rockwool insulation in millimeters.
- Select the density of your Rockwool insulation.
- Click ‘Calculate’ to get the U-Value and a visual representation.
The U-Value is calculated using the formula: U = 1 / (t * ρ * c), where t is the thickness, ρ is the density, and c is the specific heat capacity of Rockwool (0.84 kJ/kg*K).
| Thickness (mm) | Density (kg/m³) | U-Value (W/m²K) |
|---|---|---|
| 100 | 120 | 0.83 |
| 150 | 130 | 0.57 |
| 200 | 140 | 0.42 |
| Insulation Type | U-Value (W/m²K) |
|---|---|
| Rockwool (120 kg/m³, 100 mm) | 0.83 |
| Fiberglass (40 kg/m³, 100 mm) | 0.65 |
| Polyurethane (35 kg/m³, 100 mm) | 0.25 |
- Consider the U-Value alongside other factors like vapor permeability and fire resistance when choosing insulation.
- Regularly inspect and maintain your insulation to ensure it continues to perform optimally.
What is the U-Value?
The U-Value, or thermal transmittance, is a measure of heat transfer through a building element (like a wall or roof) due to a temperature difference between the inside and outside.
Why is the U-Value important?
A lower U-Value means better insulation, leading to reduced energy consumption, lower heating/cooling costs, and a more comfortable indoor environment.
U.S. Department of Energy – Insulation
Building Science Corporation – Insulation Basics