The tightness of the building stock in Finland. Havaintoja rakennuskannan tiiviystasosta.

Gives air leakage measurements which show that improvement of the tightness of the outer core of a building gives an energy saving of 5000 Kw/a in comparison to a conventionally constructed building.< Finds that the most leakage occurs at the joints of walls and ceiling, followed by the breakthrough for electrical wiring, the corners of the buildings, the windows, the joints of wall and floor and the joints of ducts and ceiling.< Older houses in Sweden have approximately the same rate of leakage as in Finland, ie 5-10 changes per hour at 50 pa.