Removing the installation inconsistencies of traditional housewrap, Enviro-Dri weather-resistant barrier system is a fully adhering spray-on, asphalt-based membrane that is applied directly to a house’s sheathing. It reduces air and moisture leaks like a traditional housewrap and prevents moisture from entering a home’s sheathing system. It also breathes to allow moisture inside the home to escape. Cost: $.40 to $.50 per square foot. Tremco Barrier Solutions. 800-876-5624.