Started from the bottom…
The foundation for this passive house consists of a slab-on-grade with a thickened perimeter footing that is thermally isolated from the ground by eight inches of high-density, structurally-rated EPS insulation (R-38). The insulation layer turns up at the edge of the slab and will connect with the above-grade wall insulation, creating a continuous thermal envelope devoid of thermal bridges, a key component of passive house buildings. The Stego Wrap vapor barrier is positioned below the slab and also turns up at the perimeter. It will be taped and sealed to the ZIP sheathing which acts as the air barrier in the walls. This will create an airtight connection between the two assemblies, another pillar of the passive house set of strategies. Additionally, frost protection is provided by five feet of horizontal perimeter insulation; and the entire system sits on a layer of compacted structural fill.
Click the first image below to view a slideshow of images detailing the foundation construction process. And stay tuned for the next blog post which will cover framing, insulation, and air sealing for the walls and roof!
Written by Christi Weber, Project Designer at TDS and Wisconsin’s first Certified Passive House Consultant. She has been in the design field for 10 years, specializing in residential projects, Passive House, Net-Zero and High Performance homes.