Kooltherm K3 Floorboard


Premium performance floor insulation

Kingspan Kooltherm K3 is a premium performance rigid thermoset phenolic insulation board for use with solid concrete and suspended ground floors. Manufactured in Castleblayney with a composite foil facing Kooltherm K3 can reduce the cost of related items such as soil removal and service connections.
Kingspan Kooltherm K3 Floorboard is manufactured without the use of CFCs/HCFCs and has zero Ozone Depleting Potential (ODP) and low Global Warming Potential (GWP).
  • Negligible smoke obscuration
  • Unaffected by air infiltration
  • Reisistant to the passage of water vapour
  • Easy to handle and install
  • Ideal for new build and refurbishment
Current Technical Guidance Documents - Part L 2011 for domestic dwellings recommends meeting or exceeding a target u value of 0.21 W/m²K for most ground floors or 0.15 W/m²K for ground floors where underfloor heating is to be used. If replacing an existing floor slab a target u value of 0.45 W/m²K is required.

Product brochure

Our product brochures include U-value tables, handling advice and installation guidance.

Kooltherm K3 Floorboard Brochure

Product information

Product Details
Product Literature


Thermal conductivity (insulant thickness) 0.021 W/m.K ( 25–44 mm)
0.020 W/m.K ( ≥ 45 mm)
Compressive strength at 10% compression 120 kPa
Facings Composite foil
Core Premium performance rigid thermoset modified resin insulant manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP).
Board size 1.2 x 2.4 m

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Kingspan Insulation Ltd.

Bree Industrial Estate


Co. Monaghan

A75 X966

Tel: +353 (0) 42 979 5000