Abstract
This paper presents a qualitative and quantitative investigation of the various factors and material properties which influence the appearance of visible condensation on walls in dwellings. Hygrothermal data, user data, thermal insulation levels and material initial rate of absorption are inter-related to establish a methodical approach for a relevant quantitative distinction between ‘absorbent’, ‘non-absorbent’ and ‘watertight’ materials. Various typical surface materials have been tested in the laboratory and graded accordingly. It is also shown that the water vapour permeance of concreet and concrete block walls has negligible influence on surface condensation.
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