The new RIVP (Paris public housing agency) building houses three services: a hostel for immigrants, a hostel for young workers, a 66 place day-care on the ground floor, as well as communal facilities. Located in Paris’ 20th arrondissement, just beyond the beltway, it is both Parisian and Lilasian. The building’s almost unique location in Paris makes it a concrete symbol of the reconnection between the two areas. Lilas residences and day-nursery’s building, answers to the climate plan regulations of the city of Paris (50 kWh/m²/year), which has for objective the reduction of greenhouse gas emissions of the Parisian territory by 75% in 2050 in comparison to 2004. PRAGMATIC ORGANIZATION With a floor area ratio of 5,1 this building is very compact, which allows the reduction of heat loss. We chose then to undertake the density of the program with a very rational organization of the dwellings. By means of the environmental engineering consulting firm Franck Boutté Consultants we worked every opening in a generous way: every dwelling, with a surface of about 23 m², possesses a window of 1,95 x 2 meters. A vertical fault accentuates the building at Doctor Gley street, throwing some natural light in as well as a series of urban framings to circulation areas creating, with this, spaces of conviviality and relaxation in every floor. Since the ground floor is mainly occupied by the day-nursery, we chose to install all the programs common to both residences (media library, fitness gym, communal kitchen) in the 4th floor. This arrangement, being more central, makes these programs more accessible to the residents. MATERIALS The building’s volume is lined by a homogeneous skin that wraps the whole building, insulating it in mineral wool and brick cladding. This brick cladding favors the sustainability and maintenance of the building, in particular response to the closeness to the periphery. To highlight the voluptuousness of this material, both faults are lined in copper, which luminosity and reflection contrast with the velvet of the dark brick, two natural materials. ENERGIES The roof is for technical use only and contains, among others, solar panels for domestic hot water, which produce 30% of the annual need for sanitary hot water in the building. Supplied by the French company Apple-Wind, wind turbines in vertical axis are also installed on the roof. They feed the day-nursery during the day and tip over their production onto the dwellings in the evening. The compensation of an estimated 25kwh/m² answers advantageously to the climate plan of Paris. This choice of energy supply, still experimental in urban areas, is particularly justified here: the building, with its raised altimetry, is located in a windy corridor.
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