40mm SOPRATHERM CW4000 (previously Celotex) - PIR Cavity Wall Insulation Board - 1200mm x 450mm - pack of 14

40mm SOPRATHERM CW4000 (previously Celotex CW4000) is a high-performance, rigid PIR insulation board specifically engineered for partial-fill masonry cavity walls. It features low-emissivity foil facings on both sides to enhance thermal performance within the cavity air space.

CHARACTERISTICS

• With a thermal conductivity of 0.022 W/mK, it allows for very low U-values with a thinner profile than traditional mineral wool, preserving more of the building's footprint.
• The foil facings are designed to reflect radiant heat back into the building. When installed with a clear residual air gap, these facings significantly improve the thermal resistance of the cavity.
• The boards are sized at 1200mm x 450mm to fit perfectly between standard wall tie spacings, which drastically reduces the need for on-site cutting and minimizes waste.
• The closed-cell structure of the PIR foam is naturally water-resistant. It will not absorb water if the cavity becomes damp, ensuring the insulation maintains its performance over the life of the building.
• Despite its strength, the board is light and easy to handle, making it simple to secure with standard cavity tie clips.

APPLICATION

• Partial-Fill Cavity Walls: The primary application. It is installed against the inner leaf of a masonry wall, leaving a residual air gap (usually 50 mm) between the insulation and the outer leaf.
• New Build & Refurbishment: Suitable for both new masonry constructions and the thermal upgrading of existing cavity walls.

CERTIFICATION

• BBA approved – certificate 24/7312 (Partial Fill Cavity Walls)
• Soprema operates independently monitored Quality and Environment Assurance Systems in line with EN ISO 9001 and EN ISO 14001.