The architect, Mark Miller, referred to the design as a “symphony of circles”. The round foundation will become the garage to the house; and with the installation of 2” of XPS insulation to the exterior of the walls and under the slab, we are creating a semi-conditioned space that will be comfortable for more uses than just parking a car. The framed core of the house will house the stairs, one of the two small mechanical rooms, and a shaft for a future elevator. It gets the same treatment as all the other exterior walls – 14” thick double stud walls that result in an R-54 insulated assembly.