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 joints and flashing, the barrier forms a seamless coating on walls that combine different types of claddings. Non-toxic and containing no VOCs, the system complies with the 2012 International Energy Conservation Code.