This Damp Proofing Membrane is a 4m x 5m sheet with a thickness of 300 microns, designed to seal out dampness and moisture in a variety of applications. Complies with BS EN 13967, certified by the BBA 96/3267 Made in the United Kingdom, this self-adhesive membrane provides a reliable barrier against water damage, making it ideal for use in buildings, walls, and floors. Its high-quality construction and adhesive properties ensure a durable and effective solution to prevent water penetration and improve the overall structural integrity of the area. Outer packaging opened but not used.