The Calder Polybit Moisture Resistant Lead Paper Underlay (25m x 1m) is designed to provide a durable and effective moisture barrier for roofing and construction projects. This high-quality underlay paper helps protect underlying structures from damp and condensation, supporting the longevity of lead sheet installations. Manufactured by Calder, this moisture resistant underlay is easy to handle and lay, making it suitable for both professional contractors and DIY applications. Its substantial length and width make it ideal for covering larger areas efficiently, ensuring comprehensive moisture protection in various building environments.