r values and u values Calculator
Introduction & Importance
r values and u values calculation is crucial in understanding the thermal performance of building materials. The r value (thermal resistance) and u value (thermal transmittance) help determine the energy efficiency of a building.
How to Use This Calculator
- Enter the r value and u value in the respective fields.
- Click ‘Calculate’.
- View the results below the calculator.
Formula & Methodology
The r value is calculated as the thickness of the material divided by its thermal conductivity. The u value is the reciprocal of the sum of the thermal resistances of all layers in the building envelope.
Real-World Examples
Case Study 1
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Case Study 2
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Data & Statistics
| Material | Thermal Conductivity (W/mK) |
|---|---|
| Brick | 0.8 |
| Concrete | 1.7 |
| Wood | 0.16 |
| Material | R Value (m²K)/W |
|---|---|
| Fiberglass | 3.14 |
| Cellulose | 3.7 |
| Polystyrene | 0.67 |
Expert Tips
- … Detailed expert tips with rich formatting …
Interactive FAQ
What is the difference between r value and u value?
… Detailed answer …
How do I calculate the u value of a wall?
… Detailed answer …
Learn more about thermal performance from the U.S. Department of Energy
Understand thermal bridging from the Building Science Corporation