How to Calculate Wall U-Value
Understanding how to calculate wall U-value is crucial for energy-efficient building design. U-value, or thermal transmittance, measures how well a building element prevents heat transfer. A lower U-value indicates better insulation.
- Select the material of your wall.
- Enter the thickness of the wall material in millimeters.
- Click ‘Calculate’.
The U-value is calculated using the following formula:
U = 1 / (∑(1 / λ) * t)
Where:
- U is the thermal transmittance (W/m²K)
- λ is the thermal conductivity of the material (W/mK)
- t is the thickness of the material (m)