Stop 6: GreenCraft Builders’ Collyville Eco House revealed the tour’s strongest design and the most concerted efforts to build a green home, addressing all aspects of product selection and performance. In fact, this home, built as part of DOE’s Building America Program, has achieved Green Built North Texas, NAHB Gold, LEED for Homes Gold, and Energy Star certifications. Construction of the 3,500-square-foot home began with deconstruction of an existing house whose materials were donated to Habitat for Humanity. The design and orientation along the east-west axis of the site take into account passive solar heating as well as sun control for cooling. Builder Chris Miles used 51% fly-ash concrete, advanced framing details, LP TechShield radiant-barrier roof deck, Galvalume radiant-barrier metal roofing, Demilec spray-foamed walls and sealed attic, Tyvek housewrap and flashing systems, James Hardie fiber-cement exterior trim, Pella low-E windows, recycled-content drywall and EnviroGlas countertops, and reclaimed wood flooring. The home also features a 28-EER Water Furnace ground source heat pump system, HEPA air filtration, Rinnai gas tankless water heaters, dual-flush toilets and low-flow fixtures, Energy Star appliances, and a 3-kw solar PV system.