 The use of concrete took on a particular prominence with the rise of the welfare state in the 1960s, in particular in state-sanctioned housing with the dominance of prefabricated concrete elements.The vernacular architecture of Finland is generally characterised by the predominant use of wooden construction.The oldest known dwelling structure is the so-called "kota", a goahti, hut or tent with a covering in fabric, peat, moss, or timber.