Insulated Cavity Closers for closing cavities around wall openings

What are the benefits of Kooltherm cavity closers?
  • Single sections fully filling cavities up to and including 150 mm achieve 30 minutes fire resistance
  • Simplified SAP calculations – bespoke set of psi–values 
  • Inhibited heat transfer – reduces thermal bridging, condensation risk and mould growth
  • Weather resistant – forms an integral DPC
  • Can be fitted with door / window frames as a  combined unit
  • Unaffected by air–infiltration
  • Easy to handle and install
  •  Non–deleterious material
  •  Insulation core manufactured with a blowing agent that has zero ODP and low GWP

Product brochure

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

Kooltherm Cavity Closer

Product information

Product details
Product Literature


Thermal conductivity (insulant thickness) 0.022 W/m.K
Compressive strength at 10% compression 120 kPa
Facings PVC-U extrusion J-section
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 100mm, 125mm, 150mm

How can we help you?

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Do you need help or advice on a project?

Contact our experienced technical services department today.

Get in touch

Kingspan Insulation Ltd.

Bree Industrial Estate


Co. Monaghan

A75 X966

Tel: +353 (0) 42 979 5000