Sto Corp. Designed to meet new more stringent building codes, StoEnergy Guard combines a fluid-applied waterproof air barrier system with a drainage mat to create an energy-efficient breathable wall assembly behind any type of cladding. Applied over sheathing joint and flashing, the barrier forms a seamless coating behind different types of claddings. The Sto DrainScreen mat speeds the escape and drying out of moisture to prevent mold and mildew. Non-toxic and containing no VOCs, the system complies with the 2012 International Energy Conservation Code. 800.221.2397.