Berlin-based architecture office rundzwei Architekten recently completed a light-filled home that showcases the many material benefits of cork. Named the Cork Screw House, the sustainably minded abode boasts a facade and roof clad in natural cork, a material that not only gives the building a highly textured appearance, but also contributes significantly to the home’s energy efficiency thanks to high insulation values. The cork home is set on a base of rammed concrete and comprises a series of split-levels for flexibility.
The decision to clad the home in cork emerged from the client’s desire for a house with good acoustic performance. Initially drawn by the acoustic insulation properties of cork, the architects were ultimately convinced by the sustainable benefits of the material, which is made from granulated cork waste that has been pressed into naturally weather- and mold-resistant panels without any artificial additives. In addition to insulating cork panels, the architects carefully chose a natural materials palette and steered clear of chemical adhesives. Wood fiber and cellulose were used as additional insulation, while timber and gypsum fiberboards were selected for their ability to absorb humidity and create a comfortable indoor environment.
Created for a family of three, the Cork Screw House is organized around a central, atrium-like staircase illuminated by a skylight. To side-step planning regulations that mandated a maximum floor size of 100 square meters, the architects lowered the base floors and designed the timber-framed upper floors as a series of split-levels, bringing the gross floor area to over 320 square meters. On the ground floor, full-height glazing floods the interior with natural light. The home also includes an exterior sunken pool that’s surrounded by rammed concrete walls for privacy.
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Due to the selection of natural materials and ample daylighting, the building “doesn’t need an active ventilation system despite the very low energy standard,” the architects explained in a project statement. “Through a stratified heat storage system supplemented by roof integrated solar panels, the heating supply is almost self-sufficient adding to the efficiency of the building’s overall performance.”
Photography by Gui Rebelo