Celotex Thermaclass Cavity Wall 21

(3 Products)

Offering excellent thermal performance with a thermal conductivity of just 0.021 W/m.K, Celotex Thermaclass Cavity Wall 21 is the perfect insulant for cavity walls. The boards boast an engineered tongue and groove joint profile, ensuring a continuous layer of insulation and optimal thermal performance, as well as protection from wind-driven rain.

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What Is Thermaclass Cavity Wall 21? 

Celotex Thermaclass Cavity Wall 21 is built with a high-performance polyisocyanurate (PIR) core, secured between two sheets of low-emissivity foil facing for superior thermal performance.

The PIR foam core is renowned for its excellent thermal insulation properties, while the low emissivity foil facings provide a reflective surface that helps to reduce heat loss and maximise thermal performance.

The BBA has verified that Thermaclass Cavity Wall 21 is an ideal insulant for full-fill cavity wall applications, provided it is installed and maintained in accordance with the certificate's instructions.

Offering high flexibility, this product can be installed with either a 10mm residual cavity for easy installation and mortar squeezing, or as an entirely full-fill solution without any residual gaps whatsoever.

Please Note - Due to safety regulations, Thermaclass Cavity Wall 21 should not be employed in the external walls of buildings exceeding a height of 18 meters (England and Wales) or 11 meters (Scotland).

Where Is Thermaclass Cavity Wall 21 Used? 

  • Full fill cavity wall applications

Thermaclass Cavity Wall 21 Thicknesses

Frequently Asked Celotex Thermaclass Cavity Wall 21 Questions

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