Kooltherm K8 Cavity Wall Insulation Board

K8 Cavity Wall Insulation

Advanced partial fill cavity wall insulation with thermal conductivities as low as 0.020 W/mK

Kooltherm K8 is an advanced cavity wall insulation board with low emissivity foil facings and reaching thermal conductivities of as low as 0.020 W/mK. This means it allows for an extremely thin cavity wall construction, which in turn maximises the usable internal floor space within the building.

Product brochure

Our product brochures include technical product data including certification, U-value tables for common build-ups, specification information, handling advice and installation guidance.

Kooltherm K8 Cavity Wall Brochure

Technical Information & Downloads

Thermal conductivity (insulant thickness) 0.021 W/m.K ( 25–44 mm)
0.020 W/m.K ( ≥ 45 mm)
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 0.45 m
The current declaration of performance is available to download below. Please email technical@kingspaninsulation.ie to request a previous declaration of performance.

Kooltherm K8 DoP 005 March 2021


Kingspan Kooltherm K8 wall insulation boards are produced at Kingspan Insulation’s Castleblayney, Ireland manufacturing facility. They are manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and a low Global Warming Potential (GWP).
Planet Passionate
Through our Planet Passionate group-wide sustainability programme, we aim to make significant advances in the sustainability of our business and our products.


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