90mm Kooltherm K103 is a high-performance floor insulation board engineered for use beneath solid concrete and suspended timber floors. Delivering a thermal conductivity of 0.019 W/mK, this board provides outstanding thermal resistance. Suitable for both new construction and renovation applications, it represents a premium choice for floor insulation requirements.
Brand: Kingspan
Thickness: 90mm
Length: 2400mm
Width: 1200mm
Dimensions: 2,400mm x 1,200mm x 90mm
Coverage: 8.64m2
Density: 40kg/m3
Compressive Strength: >120 (kPa)
Material: Premium-grade rigid thermoset phenolic insulation with low thermal conductivity.
Profile: Square Edge
R-Value: 4.70m2K/W
Thermal Conductivity: Kingspan K103 maintains a thermal conductivity of 0.019 W/mK across all available thicknesses.
Weight: 2.67 kg (Approximate density of 3.70 kg/m2 at 100mm thickness)
Fire Classification: Achieves Euroclass C-s2,d0 when tested to EN 13501-1: 2018.
Vapour Resistivity: 370MNs/gm
Facings: Glass tissue-based facing applied to both surfaces, factory-bonded to the core.
Finish: Glass tissue facings
Pack Quantity: 3
Applications: Floor insulation ǀ Underfloor Heating Insulation
BBA Certified: Yes (no. 16/5299)
Vapour Control Layer: Yes
Features: Premium ǀ Non-deleterious
These 90mm Kooltherm floor insulation boards are exceptionally lightweight, enabling straightforward transportation, handling, and installation on site.
Manufactured at the Kingspan Insulation facility in Pembridge, Herefordshire, the 90mm Kooltherm K103 incorporates a glass tissue-based facing adhered to the insulation core during production. This facing is applied to both sides of the board, providing a robust and long-lasting bond.
The 90mm Kingspan K103 Phenolic insulation features a premium rigid thermoset phenolic core. This material is fibre-free and manufactured using a blowing agent with zero Ozone Depletion Potential (ODP) and minimal Global Warming Potential (GWP). The outcome is a sustainable insulation product delivering exceptional thermal performance.
Explore our full Kingspan range and refine by thickness or coverage using the filters on the left. For technical advice regarding product suitability for your project or to request a volume discount quotation, contact us by phone on +4402038839057, email sales@insulationbee, or use Live Chat - Lowest UK Insulation Prices.








