Tremco Barrier Solutions. Designed to block the passage of moisture while providing breathability, the Enviro-Dri Weather Resistant Barrier (WRB) system is a fully and permanently adhered liquid membrane applied directly to a home’s sheathing. No staples or nails are required. The system includes Enviro-Dri field membrane and joint sealant, along with Enviro-Dri Counterflashing fabric to act as a watershed at the bottom of walls, around window and door openings, and at roof-wall junctures. 800.876.5624.