The Celotex 40mm TB4040 is a high-performance insulation board, designed for both new build and refurbishment applications. Measuring 2.4m x 1.2m, its versatile and easy to install, providing excellent thermal performance due to its low lambda value. Manufactured in the UK, this PIR board offers enhanced insulation capabilities, making it an ideal choice for wall and roof applications where efficient energy usage is a priority.