Path 2 Zero Energy Wall - Weather-Resistive Barrier is a water-based, single component primerless elastomeric fluid-applied air barrier membrane for exterior wall assemblies. It functions as an air and moisture vapor retarder. Applied in a single coat, this elastomeric weather- proofing membrane provides superior protection from moisture vapor and air intrusion contributing to a seamless, durable airtight building envelope. Vapor permeable allows for vapor diffusion. Saves on labor cost. Primerless and can be applied in one single coat by a sprayer or roller. UV and water resistant once fully cured. VOC compliant in the US.