Green Project of the Week: Davidson Passive House
This project is the first fully certified Passive House in Davidson, N.C. Development of the house started in 2020 by HELD Architecture. They served as the architect and Certified Passive House Consultant (CPHC) for this project while Bird Dog Group were the builders.
HELD Architecture is a Charlotte-based architecture firm founded by Kristina Held, AIA, with a mission to design spaces that connect people, communities and the environment. With deep roots in the Charlotte-Mecklenburg region and a strong commitment to sustainability and wellness, HELD creates architecture that blends innovation with integrity with roots in place, purpose and people.
“We approach every project as an opportunity to shape a more regenerative built environment — one that prioritizes energy efficiency, resilience and quality of life” said Kristina Held.
The home’s construction showcases a double stud wall filled with blown-in fiberglass insulation, complemented by an Armor Wall continuous insulation board inward of the sheathing, featuring factory-applied liquid waterproofing. It also incorporates continuous XPS under slab insulation and blown-in cellulose insulation over an Intello air barrier, with a naturally ventilated attic.I t successfully passed the PHIUS-required blower door test, achieving 0.6 ACH50, an impressive threshold for the certification. The home’s exceptional airtightness and robust insulation maintain a stable indoor temperature, even amidst significant outdoor fluctuations consistent with the area.
The design team at HELD strategically oriented the house with its long axis running east-west to optimize solar gain and energy efficiency. The southern windows are thoughtfully shaded by the porch roof, admitting the shallow winter sun angles while blocking the steeper summer sun angles. This is a trademark element of passive certification, elevating the natural landscape in design. This residence consumes approximately 25% of the energy of a conventionally built home with use of a solar array and battery system. These elements make it net-positive in annual energy use. The home also features Energy Star appliances, WaterSense certified fixtures, low VOC paint and LED lighting.
“The home’s distinction lies in its fusion of Passive House efficiency with a traditional classic design, a rare and innovative combination,” said Held. “Notably unconventional for a Passive House, the extensive use of glass, deemed essential for maximizing daylighting and showcasing the property’s stunning views sets it apart while enhancing its aesthetic and functional appeal.”
