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In order to achieve the passive energy standard the project includes a geothermal network as well as an earth cooling tube network burried under the bottom slab. The building is entirely constructed out of visible timber : the floors and walls are made of cross-laminated timber panels and the beams are in glulam or massive timber. The top floor is covered by a green roof which also includes photovoltaic panels. Due to a soil having low geomechanical properties and to avoid thermal bridges, a second underground concrete slab was created under the networks, resting on piles so as to prevent excessive settlements.