Kingspan K18 U-Value Calculator
Kingspan K18 is a high-performance, rigid insulation board designed for use in roof, wall, and floor applications. Understanding its U-value is crucial for architects, builders, and homeowners to ensure energy efficiency and compliance with building regulations.
- Select the thickness of the Kingspan K18 board.
- Choose the insulation type and thickness (if any).
- Click the ‘Calculate’ button to see the U-value and a visual representation.
The U-value is calculated using the following formula: U = 1 / (∑t / λ), where t is the thickness of each layer and λ is its thermal conductivity. The calculator uses the thermal conductivities provided by Kingspan.
| Thickness (mm) | Insulation (mm) | U-Value (W/m²K) |
|---|---|---|
| 50 | 20 (PIR) | 0.24 |
| 75 | 30 (PIR) | 0.20 |
| 100 | 40 (PIR) | 0.17 |
| Material | Value |
|---|---|
| Kingspan K18 | 0.022 |
| PIR Insulation | 0.023 |
- Increase insulation thickness to reduce U-value and improve energy efficiency.
- Consider using PIR insulation for its slightly lower thermal conductivity.
- Always check local building regulations for U-value requirements.
What is a U-value?
A 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. It’s expressed in W/m²K.
How does insulation affect U-value?
Adding insulation increases the total thickness of the building element, reducing its overall thermal conductivity and U-value.
Part L of the Building Regulations sets out the energy efficiency requirements for new buildings.
Energy Efficiency Basics from the U.S. Department of Energy provides more information on U-values and insulation.