Aero-Block product line offers energy-efficiency solutions for the building enclosure. The new polymer-modified-asphalt technology is available in three formats. The fluid-applied, solvent-based polymer and fluid-applied water-based polymer versions can be applied by brush, spray, or roller. There is also a pre-fabricated, self-adhering multi-layer membrane. The line creates vapor-closed protection, meeting requirements for a Class 1 air/vapor barrier.