Soprema Thermaclass 115mm Cavity Wall 21

The 115mm Thermaclass Cavity Wall 21 delivers outstanding thermal performance for full-fill and partial-fill cavity wall applications. This rigid polyisocyanurate (PIR) insulation board (previously Celotex) achieves exceptional efficiency with a thermal conductivity rating of 0.021 W/m.K, making it an ideal choice for masonry cavity walls seeking superior energy performance.

Product specification

• Model: 115mm Soprema Thermaclass Cavity Wall 21
• Thickness: 115mm
• Width: 450mm
• Length: 1190mm
• Pack Quantity: 5
• Board Coverage: 0.54m2
• Pack Coverage: 2.7 m2
• Weight/m2: 3.55kg
• Weight: 9.59kg
• Thermal Conductivity: 0.021W/mK
• R-Value: 5.45m2K/W
• Fire Rating (Reaction to Fire): E
• Applications: Walls - External Wall Insulation - Full Fill Masonry Cavity Walls

Product Features

• Lightweight 1190 x 450mm boards (installed dimensions)
• Tongue and groove edge profile
• Low emissivity foil facing
• BBA approved – certificate 16/5343 (Full Fill Cavity Walls)

Product Benefits

• Superior Thermal Efficiency: Achieves outstanding thermal performance with a conductivity of 0.021 W/m.K, reducing the thickness required to meet target U-values whilst maintaining structural integrity.
• Enhanced Foil Facing: The low emissivity foil layer significantly boosts thermal performance within sealed cavity spaces, delivering improved U-values even with a 10mm residual cavity allowance.
• Straightforward Installation: Engineered to align with standard cavity wall tie spacing, these rigid lightweight boards are simple to transport, position, and secure without specialist equipment.
• BBA Certified: This product carries full BBA certification (16/5343), validating its performance for full-fill cavity wall installations when fitted and maintained according to certification requirements.

Key Considerations

Ensure all installations comply with current Building Regulations and applicable construction standards for your region. Fire safety requirements and height restrictions must be observed throughout the installation process.

External Wall Insulation - Full Fill Masonry Cavity Walls

Full-fill masonry cavity insulation involves placing high-performance materials within the cavity between two masonry layers, creating a continuous thermal barrier. This approach significantly enhances building energy efficiency, minimises thermal bridging, and improves occupant comfort levels. Premium polyisocyanurate PIR boards with low emissivity facings provide exceptional thermal resistance. The 115mm Soprema Thermaclass solution streamlines the installation process whilst maximising insulation effectiveness, delivering a more sustainable and economical building envelope.

Browse our complete Soprema insulation range and refine by thickness or coverage using the filters on the left. For technical advice on product suitability, competitive bulk quotations, or further information, contact us on +4402038839057, email sales@insulationbee, or use our Live Chat service.