Following up on our earlier post celebrating our most recent award-winning project, Harvey and Kay’s “Pleasant Future Vision” PHIUS+ Zero certified passive house home, we continue to take you behind the scenes revealing some of the high performance assemblies employed on this amazing project. Bringing the building envelope down the exterior wall of the home to the below grade condition in this post we are sharing the high-performance foundation wall assembly. For this home we used a system called Insulated Concrete Form (ICF) as the core of the wall. This consists of 2 1/2″ thick walled Expanded Polystyrene (EPS) block that is stacked up like Legos, laced with steel re-bar and then the 10″ core is filled solid with concrete. The wall is then augmented with supplemental insulation to the exterior and the interior yielding an aggregate R value of R-48. Compare that to the current code minimum of R-10. Learn more here: https://bit.ly/3XuzClF