Kingspan Calculator
Calculate U-values and thermal performance for Kingspan insulation products to meet UK building regulations and achieve optimal energy efficiency.
U-Value Calculator
Important Note
This calculator provides indicative values only. For official compliance calculations and detailed thermal bridging assessments, please consult Kingspan technical specialists or use the official Kingspan U-value calculator.
Kingspan Insulation Products
Kingspan Kooltherm (PIR)
Thermal Conductivity: 0.018 – 0.023 W/mK
Applications: Walls, floors, roofs, sarking boards
High-performance rigid thermoset phenolic insulation with excellent fire performance and low smoke emission.
Kingspan Therma (PIR)
Thermal Conductivity: 0.022 – 0.026 W/mK
Applications: General purpose insulation for all building elements
Rigid thermoset polyisocyanurate core providing excellent thermal performance for various construction applications.
Kingspan OPTIM-R (VIP)
Thermal Conductivity: 0.007 W/mK
Applications: Space-constrained applications
Vacuum insulation panel technology offering up to 5 times better thermal performance than conventional insulation.
Kingspan GreenGuard (XPS)
Thermal Conductivity: 0.033 – 0.036 W/mK
Applications: Below ground, heavy-duty flooring, inverted roofs
Extruded polystyrene with high compressive strength, perfect for demanding structural applications.
Understanding U-Values
U-values measure the rate of heat transfer through building elements. The lower the U-value, the better the thermal performance. UK Building Regulations set maximum U-value targets for different building elements:
- Walls: 0.28 W/m²K (new build), 0.30 W/m²K (renovation)
- Floors: 0.25 W/m²K (new build), 0.25 W/m²K (renovation)
- Roofs: 0.16 W/m²K (new build), 0.18 W/m²K (renovation)
Achieving these targets requires careful selection of insulation materials and thicknesses, where Kingspan products excel due to their superior thermal conductivity values.
Calculation Methodology
U-value calculations follow the principle that thermal resistance (R-value) equals thickness divided by thermal conductivity:
R = thickness (m) ÷ λ (W/mK)
The total R-value is the sum of all layer R-values, plus surface resistances:
Total R = R₁ + R₂ + R₃ + … + Rₛᵢ + Rₛₒ
Finally, the U-value is calculated as:
U = 1 ÷ Total R (W/m²K)
This calculator includes standard surface resistances: external (0.04 m²K/W) and internal (0.13 m²K/W).