Humidity in buildings and thermal bridges. Wohnfeuchte und warmebrucken.

The installation of much tighter windows has led to reduced rates of natural ventilation in German dwellings. This has resulted in increased indoor air humidity and condensation formation on the inner surfaces of external building elements with thermal bridges. Notes the areas most at risk from condensation and mould, in particular corners of outside walls and along the ceiling angle. Describes the results of an investigation into the effect of various levels of insulation in these structures, corresponding to the period before the energy crises, to today's requirements, and to requirements for the end of the decade. Determines for each case the minimum air change rate to prevent condensation damage. Draws conclusions concerning heating levels and windowdesign.