Architecture, Building and Structure Design Haus am See Residential House by Carlos Zwick Haus Am See is a residential house built beside a lake in Potsdam, Germany. The building rests on a steel skeleton carried by 40 diagonal stilts set on ten separate foundations, so the centuries old trees on the site remain untouched. One tree grows through the house. Ceilings, floors and walls are made of pine wood, the thermal insulation is cellulose fiber, and the facade is formed of narrow vertical larch slats. The roof surfaces are planted. Sliding windows three meters high and seven meters wide open the living spaces toward the water.