On a 900 m2 trapezoidal plot, with a gentle slope leading down to a small lake beach, stands the 590 m2 Casa Areia, in the municipality of Xangri-lá, on the north coast of Rio Grande do Sul.

The shape of the plot was a determining factor in the design. Two perpendicular volumes make up the building's simple geometry.

The 18 x 7 meter pool extends from the front of the plot, overhanging the beach and giving a sense of continuity between the waters. It is followed by the second floor, which houses the intimate area. The three suites, as well as the family room on this floor, face the view of the lake to the south. Motorized sheds were installed along the length of the volume to ensure that the sun gets in, as well as cross ventilation. Returning to the first floor, this floor is trapezoidal in shape, in harmony with the terrain. Facing forward, the entrance door is hidden in the horizontal panel on the façade, made of ecological WPC wood, as are the windows of the two guest suites, which directly receive the north sun. The entrance hall gives privacy to the 87 m2 social area, which extends along the façade facing the lake and the east side, with minimalist frames that integrate the internal spaces and the covered veranda by the pool.

Formally, the front façade consists of two overlapping volumes, with a subtle misalignment. While the lower volume overlooks the garden and is covered in shrimp frame panels, also in WPC ecological wood, the upper volume follows the trapezoidal angle of the terrain, with a linear brise-soleil in the same material, finished off by an undulation that exposes the intimate living area and filters the light in, providing scenic effects in the circulation. The façade facing the lake harmonizes with the upper volume, which floats on a glass base and overlooks the social area.

As always, Stemmer Rodrigues' projects have a special concern for sustainability. In addition to taking care with cross ventilation and insolation, all the bathrooms have natural lighting and ventilation via zeniths. The house is powered by photovoltaic panels, hidden in the roof, which generate energy even for heating the pool.