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The refurbishments in old buildings in Lisbon means, usually, to know how to deal with wood structure floor boarding's buildings. The architects have almost always the problem of the finishing of these kind of floors with a different material from wood, because of the consequences of the stresses, the contractions and expansions of the wood in which floors are made and the curvature or flexion due to the flexibility of the material wood and also, due to the surcharges – persons as dynamic charges and the static ones, the weight of the furniture, shelves, goods, etc.