The Woodstock Passive House (WPH), built in updstate New York’s famous Colony of the Arts, was certified by the Passive House Institute US (Phius.org) in 2016. It was the second AAC Passive building in the US certified by Phius, and the first built without foam insulation.

The autoclaved aerated concrete (AAC) structure, 8” thick load bearing exterior walls, was insulated below grade with 10” of Foamglas (tm) cellular glass, on the exterior with 6” of continuous Rockwool Comfortboard 80, and 24” of cellulose above the ceiling. Note Foamglas, with one-S, is a trademark for a cellular glass product developed in 1939. The siding is James Hardie Fiber Cement. These construction and material choices reduce the energy use and maintenance cost of a typical home. The structure is resistant to fire, mold, termites, mice, and other pests. Perhaps most important, passive building provides unsurpassed comfort.

The WPH is certified by the Passive House Institute US, the US Department of Energy Net Zero Energy Ready program, New York Energy Star, and the Environmental Protection Agency’s Water Sense and Indoor Air Plus programs.

AAC construction is resilient: https://www.resilientdesign.org/aac-an-ideal-material-for-resilient-buildings/ 

With a 7.56 kW photovoltaic solar system, the WPH home and apartment are operating near net-zero energy.