Abstract
This article describes the process of condensation in flat roofs of concrete or similar material. The movement of the moisture front in the roof under non-steady-state conditions is studied. It appears that the calculation technique developed for steady-state conditions can be used for non-steady-state conditions as well, provided average yearly climatic conditions are taken into account. It also becomes evident that the former fear of condensation in this particular type of flat roofs is largely exaggerated. Under normal conditions there is usually no cause for great anxiety. If “on average” condensation does occur, however, for instance in air-conditioned buildings, the moisture front will reach an equilibrium where the maximum vapour pressure equals the average yearly vapour pressure of the inside air. The variation of the front from this equilibrium level will be very slight.
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