A wash house is a pond fed with water generally by natural origin which has as vocation first to allow to rinse the linen having washed it. The wash house in impluvium has as feature to present blind facades, lighted(enlightened) by a zénithale opening, avoiding air currents in wagtails. But above all(before any), the roofing of the impluvium allows to pick(get) the rainwater up. That of Jametz is in double(copy) impluvium and is restored.