Boulder House

The house is built around a series of retaining walls that step up in 2’ intervals every 16’. These walls are exposed to the interior, registering the variable depth of the surrounding soil and forming all windowsills. To the exterior, these walls are clad in hand-chipped bluestone, reflecting the surrounding dry stone walls. Atop the retaining walls sits a lighter wood structure that is wrapped in a cedar rainscreen from sill to ridge, integrating water management.

A central goal was to greatly exceed the code minimum thermal performance requirements for this very cold climate. Framed walls and ceilings employ a combination of batt insulation and continuous rigid exterior insulation. Roof-to-wall transitions are kept tight in order for insulation and waterproofing to be run continuously over them. Foundation walls were built from hollow insulated Korfill CMUs, greatly increasing their thermal resistance in a scheme where they crossed from subterranean to exposed.


Active heating costs were a great concern for the client. We were able to engineer the large double-sided hearth that separates the living room from the kitchen to channel its heat under the raised floors of the main house, supplying it through registers in the kitchen, bedroom and bathroom. The hearth itself can be closed off with thermally insulated glass doors, receiving make-up air from the exterior in order to burn efficiently and safely all night long.