Phenolic Floor Insulation

Phenolic floor insulation offers exceptional thermal performance for ground floors, combining high insulation values with a slim profile. Kingspan Kooltherm K103 is a premium phenolic insulation board designed for solid concrete and suspended floors, delivering outstanding thermal conductivity as low as 0.018 W/m·K—much better than traditional materials like PIR or EPS.

These rigid boards are lightweight, easy to install, and suitable for use beneath screed or concrete floor finishes. With excellent compressive strength, low water absorption, and impressive fire performance, K103 is a go-to choice for architects and contractors aiming to meet stringent energy standards without compromising on floor build-up height.

Whether you're upgrading an existing floor or working on a new build, Insulation UK offers Kingspan K103 phenolic floor insulation in a variety of thicknesses. It’s a smart, space-saving solution that helps you hit your U-values while maximising usable floor area.