SureMB 70 SA Base Ply is a smooth sand surface SBS (StyreneButadiene-Styrene) self-adhered membrane. Manufactured with a fiberglass mat that is saturated and coated with a premium quality bitumen with durable SBS elastomer with a poly release liner for easy installation. It is designed to be used as an air and vapor barrier and/or a temporary roof Insulation may be adhered directly to the SA 70 using our Flexible DASH adhesive. SureMB 70 SA can be used in Versico's multiple ply systems as a base ply.