40mm Celotex TB4040 PIR Insulation Board 2400mm x 1200mm

The 40 mm Celotex TB4040 PIR insulation board is a rigid, foil-faced polyisocyanurate (PIR) board sized 2400 mm × 1200 mm, crafted for versatile use across floors, walls and roofs in both new build and refurbishment projects. With a thermal conductivity of 0.022 W/m·K the board delivers strong thermal efficiency, allowing buildings to meet U-value targets with minimal thickness. The foil facings on both sides improve thermal performance in cavity or air-space settings. Lightweight yet structurally stable, the board is easy to handle and cut, making installation straightforward even in tight or complex spaces. Suitable for a range of applications — from flat or pitched roofs to masonry walls, timber or steel-framed systems, and concrete or timber floors — TB4040 is a reliable choice for improving energy efficiency and reducing heat loss.

• Low thermal conductivity (0.022 W/m·K) for superior heat retention
• Foil-faced both sides yields enhanced insulation performance
• Rigid PIR core — lightweight yet dimensionally stable
• Covers 2.88 m² per board (2400 mm × 1200 mm)
• 40 mm thickness balances insulation performance and compact profile
• Suitable for floors, walls, pitched/flat roofs and steel or timber frames