Kooltherm Cavity Closer


Insulated cavity closer

Kingspan Kooltherm Insulated cavity closer is used for closing cavities around openings in masonry walls.
Kingspan Kooltherm Cavity Closer is PVC–U extrusion J-section with a Kooltherm fibre free rigid thermoset insulation core that maintains continuous insulation around window and door openings.
It is suitable for use with timber, metal or PVC window frames and can also be supplied to order in curved section.
  • Weather resistant & Integral DPC
  • Continous insulation maintained
  • Reduces heat loss
  • Simplifies construction
The Kooltherm cavity closer can be provided in three widths of 100mm, 125mm and 150mm at 2.4m lengths and can be easily trimmed onsite to ensure a tight fit between cavity leafs.

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

Related case studies

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