Materials and systems were selected to meet sustainability targets and to satisfy design goals highlighting local finishes and craftspeople. The architects replaced the SIP walls of the prototype with a super-insulated wood-frame structure of LVL lumber to avoid the energy intensive importation of materials. The polished concrete thermal-mass ground floor (featuring local river-stone aggregate) is heated in the winter with an efficient hydronic radiant system. The wood-framed upper floor also includes radiant heat between joists. Windows on opposite sides of the narrow house afford natural ventilation during most days while a whole-house fan at the very top of the “wedge” can evacuate heat and pull cool air from the shaded bottom courtyard. Thermal performance exceeds New Zealand standards for a single-family house.
Dennis Radermacher - Lightforge