Celotex Thermaclass Cavity Wall 21 PIR Insulation Board 140mm (0.53m²)

Thermaclass Cavity Wall 21 is an easy to install polyisocyanurate (PIR) thermal insulation board for full fill cavity wall applications (0.021 W/m.K).

Celotex Thermaclass Cavity Wall 21 is a rigid polyisocyanurate (PIR) thermal insulation board with a low-emissivity foil facing on both sides and a tongue and groove edge profile. The boards are mainly used as thermal insulation in full fill and partial fill masonry cavity wall applications and are sized to fit standard cavity wall tie spacing.

With a declared thermal conductivity of 0.021 W/m·K and thicknesses of 90 mm, 115 mm and 140 mm, Thermaclass Cavity Wall 21 provides excellent thermal performance to help achieve target U-values while maintaining " "practical cavity widths. The product is BBA certified for defined full fill cavity wall applications and is " "manufactured under independently monitored quality and environmental management systems in line with EN ISO 9001 " "and EN ISO 14001.

• Lightweight 1190 x 450 mm PIR insulation boards (installed dimensions).
• Tongue and groove edge profile to help form a continuous insulation layer.
• Low emissivity foil facings on both sides.
• Declared thermal conductivity 0.021 W/m·K.
• BBA certified for defined full fill cavity wall applications.

Typical applications

Full fill masonry cavity walls in external walls, with up to a 10 mm residual cavity to aid installation and accommodate mortar squeeze, or as a full fill solution with no residual cavity, where permitted by the BBA certificate and applicable Building Regulations.

Key considerations

When using Celotex Thermaclass Cavity Wall 21, you need to satisfy yourself that use of the product meets all relevant national Building Regulations and guidance as well as local, national and other applicable standards for your construction or application, including requirements in relation to fire and applicable height restrictions. Celotex Thermaclass Cavity Wall 21 should not be used in the external walls of buildings over 11 metres in height, where only non-combustible or limited-combustibility insulation should be used. Always refer to the latest product datasheet, Declaration of Performance, BBA certificate, safety data sheet and specification guide for details of permitted constructions, limitations of use and performance characteristics.