Study of this chapter will enable the reader to:

identify the moisture content of humid air by its vapour pressure;

understand dew-point temperature;

identify the sources of moisture within a building;

understand the flow and storage characteristics of moisture flows found in habitable building;

explain the causes of condensation;

discuss the damage which can be caused by condensation;

calculate vapour diffusion resistance;

calculate vapour flow;

calculate air vapour pressure;

calculate air dew-point temperature;

understand atmospheric pressure terms;

use the e x calculator function;

use the loge calculator function;

convert from e x to loge forms;

draw thermal temperature gradients;

draw dew-point temperature gradients;

identify condensation zones;

discuss surface and interstitial condensation;

understand where to install thermal insulation and vapour barriers in relation to condensation risk and thermal and structural integrity requirements.