90mm Ecotherm Eco-Cavity Full Fill Cavity Wall PIR Insulation Board - 1200mm x 450mm - pack of 4

90mm EcoTherm Eco-Cavity Full Fill PIR Insulation is a specialist PIR (polyisocyanurate) insulation board designed specifically for traditional masonry cavity walls. Unlike standard partial-fill boards that require a residual 50mm air gap, this product is engineered to occupy the entire cavity, allowing for significantly higher thermal performance without increasing the overall thickness of the wall. This system is the go-to choice for modern construction projects where meeting strict Part L Building Regulations is required but footprint space is at a premium. By using a high-performance PIR core with low-emissivity foil faces, it provides a superior thermal barrier in a much slimmer profile than traditional mineral wool.

CHARACTERISTICS

• Suitable for 100mm thick cavity, maintaining a residual 10mm cavity.
• With a thermal conductivity of just 0.022 W/mK, these boards are incredibly efficient and allow developers to achieve lower U-values while keeping the external walls as thin as possible.
• The boards feature a precision-cut tongue and groove edge profile on all four sides. This ensures a tightly interlocked, continuous layer of insulation that eliminates the risk of thermal bridging and prevents moisture from tracking across the cavity.
• Designed to be installed without a residual air gap. This simplifies the construction process and maximises the insulation volume within a standard 100mm cavity.
• The PIR core is inherently water-repellent, and the foil facings provide an additional layer of protection. This is vital for maintaining the integrity of the insulation in the damp environment of a wall cavity.
• The product carries British Board of Agrément certification, ensuring it meets the rigorous safety and durability standards required for UK housebuilding.

APPLICATION

• New Build Residential: The standard choice for developers looking to maximise internal floor area while hitting high energy-efficiency targets.
• Commercial Masonry Construction: Used in large-scale brick and block projects where thermal consistency is critical across expansive elevations.
• Extensions: Ideal for matching existing wall thicknesses while providing modern levels of insulation.

CERTIFICATION

• BBA Certificate 24/7114

Manufactured under a management system certified to 

• ISO 9001: 2015 (Quality Management Systems), 
• ISO 14001: 2015 (Environmental Management Systems), 
• ISO 45001: 2018 (Occupational Health and Safety Management Systems), 
• ISO 50001: 2018 (Energy Management Systems),
• ISO 37301: 2021 (Compliance Management Systems).