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Celotex Thermaclass Cavity Wall 21 (115mm)

Thermaclass Cavity Wall 21 is an easy to install, polyisocyanurate (PIR) insulation board for full fill cavity wall applications, with excellent thermal performance (0.021 W/m.K). It can be installed with up to a 10mm residual cavity (to support ease of installation and accommodate mortar squeeze) or as a full fill solution with no residual cavity.

The boards feature an engineered tongue and groove joint profile, helping to ensure a continuous layer of insulation to maximise thermal performance and provide protection from wind driven rain. The low emissivity foil facings provide improved thermal performance in sealed cavity air spaces, improving the achievable U-value.

Features and benefits

  • Excellent thermal performance with a thermal conductivity of 0.021W/m.K, reducing the thickness of insulation required to hit the target U-value.
  • British Board of Agrément (BBA) certified. Assessed by the BBA as fit for use in defined full fill cavity wall applications if installed, used and maintained as set out in the certificate.
  • Lightweight and easy to install – The boards are sized to fit standard cavity wall tie spacing. They are light and rigid, assisting with ease of transportation, handling and fitting.

Product code : 28MTC1115

(Pack)

Key Performance Criteria

  • Thermal Conductivity : 0.021W/mK
  • Euroclass Fire Classification : E