Thermaclass Cavity Wall 21 (1190mm x 450mm) - All Sizes

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Thermaclass Cavity Wall 21 is an easy to install, high thermal performance polyisocyanurate (PIR) insulation board for full fill cavity wall applications, with a thermal conductivity of 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 have a low emissivity foil facing to each side and 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.

Key Features

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

 Properties and Performance

• Board size: 1190 x 450mm (installed) 1205 x 465mm (including tongue)
• Thickness : 90-140mm
• Material: PIR
• Lambda: 0.021 W/m.K
• Reaction to Fire: Euroclass E Reaction to Fire classification, according to EN 13501-1 (Products with this level of classification are not provided with a rating for smoke emission)

Product Benefits

• Outstanding Thermal Performance: The low thermal conductivity of 0.021 W/m·K ensures that you can achieve your desired U-value with a reduced thickness of insulation.

• Low Emissivity Foil: The foil facing doesn't just improve thermal performance; it also creates an effective barrier in sealed cavity air spaces, helping you further optimize your U-value.

• Ease of Installation: These boards are designed to fit standard cavity wall tie spacing. They are not only lightweight but also rigid, making them easy to transport, handle, and fit.

• BBA Certified: With the BBA's seal of approval, you can have confidence in the product's quality and suitability for full-fill cavity wall applications.

Applications

Thermaclass Cavity Wall 21 is ideal for external walls with full-fill cavity wall insulation needs, ensuring your space remains well-insulated and energy-efficient.

Key Considerations

Please note that, according to Building Regulations, Thermaclass Cavity Wall 21 should not be used in the external walls of buildings over 18 meters in height in England and Wales, or 11 meters in height in Scotland. Recent changes in regulations stipulate that only non-combustible insulation or insulation of limited combustibility can be used in buildings of such heights.

Frequently Asked Questions

What is Thermaclass Cavity Wall 21? Thermaclass Cavity Wall 21 is a high-quality polyisocyanurate (PIR) insulation board designed for full-fill cavity wall applications, providing excellent thermal performance.

What thicknesses are available for Thermaclass Cavity Wall 21? Thermaclass Cavity Wall 21 is available in thicknesses ranging from 90mm to 140mm.

What is the thermal conductivity (Lambda) of Thermaclass Cavity Wall 21? The thermal conductivity of Thermaclass Cavity Wall 21 is 0.021 W/m·K, indicating excellent insulation capabilities.

Is Thermaclass Cavity Wall 21 fire-resistant? Thermaclass Cavity Wall 21 holds a Euroclass E Reaction to Fire classification according to EN 13501-1. However, it is not rated for smoke emission.

What are the benefits of using Thermaclass Cavity Wall 21? The benefits include exceptional thermal performance, low emissivity foil facing for improved insulation, ease of installation, and BBA certification.

Is it easy to install Thermaclass Cavity Wall 21? Yes, these boards are designed for easy installation. They are sized to fit standard cavity wall tie spacing and are lightweight and rigid for convenient handling and fitting.

Is Thermaclass Cavity Wall 21 BBA certified? Yes, Thermaclass Cavity Wall 21 is BBA approved, certified under certificate 16/5343, which attests to its suitability for defined full-fill cavity wall applications.

Where can Thermaclass Cavity Wall 21 be used? It is designed for external walls with full-fill cavity wall insulation needs, ensuring effective insulation and thermal efficiency.

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