Kingspan K103 Floor Boards

Kingspan Kooltherm K103 Floor Insulation Board

Kingspan Kooltherm K103 is a high-performance phenolic insulation board designed for insulating solid concrete and suspended floors. With an outstanding thermal conductivity of just 0.018 W/m·K, K103 offers excellent thermal efficiency with a thinner profile—ideal for meeting demanding U-value targets without raising floor levels significantly.

Each board is foil-faced on both sides to enhance thermal resistance and moisture control. Lightweight and easy to install, K103 can be used beneath screed, concrete slabs, or timber floors in both new build and retrofit applications.

Key Features:

• Thermal conductivity: 0.018 W/m·K

• Foil-faced both sides for improved thermal and vapour control

• Compatible with underfloor heating systems

• Excellent compressive strength for floor load-bearing

• Available in a wide range of thicknesses

• Helps meet Part L Building Regulations for floors

Ideal For:

• Solid ground floor insulation beneath screed or concrete

• Suspended timber floors in residential buildings

• Underfloor heating systems where thin build-up is critical

• New builds or retrofit projects requiring high thermal performance

At Insulation UK, we stock Kingspan K103 floor insulation boards in multiple sizes and thicknesses—ready for fast UK-wide delivery.