40mm Kingspan Kooltherm K103 Floor Insulation Board 2400mm x 1200mm (8/Pack)

Kingspan Kooltherm K103 Floor Insulation Board in a 40mm thickness.This board delivers premium thermal performance for ground-floor constructions. The fibre-free phenolic core achieves a low thermal conductivity of 0.018 W/m·K, supporting strong energy retention in concrete slabs, screeded floors, and suspended timber systems.The board is faced on both sides with a durable glass-tissue layer autohesively bonded to the core, providing a stable surface compatible with common floor build-ups. Its closed-cell structure resists air infiltration and water vapour passage, ensuring consistent long-term performance within the floor assembly.A minimum compressive strength of 120 kPa at 10% compression accommodates typical domestic and commercial floor loading when used beneath unreinforced screeds. Its lightweight construction helps reduce site disruption by limiting soil removal and simplifying service routes during floor preparation.Handling, cutting, and placement remain straightforward in both new-build and refurbishment settings, with the material offering a non-deleterious insulation option produced using a zero-ODP, low-GWP blowing agent.Manufactured with a 40mm thickness, it suits underfloor heating retrofits.