This modern and spacious flat-roofed house was built according to the demanding Minergie-P-Eco energy-efficiency standard. Given that we have always made exclusive use of ecologically sound materials such as timber, brick, natural stone, ceramics, cellulose fibre insulation etc. from the very beginning, the task of deploying the right materials to ensure compliance with the standard did not represent a major challenge. However, the sealing materials and building engineering systems did require considerable attention. The façade (a combined pillar and clapboard construction), the window frames and the roof were rendered in untreated larch wood, which explains the Romansh name Casa Larisch. In contrast, the interior finishing was completed predominantly in larch and oak, combined with smooth plasterboard.