This document specifies requirements, calculation procedures and instructions for the planning and implementation of climate-related moisture protection in buildings. It does not apply to the construction of structures. Ancillary rooms, which are part of occupied rooms, are treated as occupied rooms within the meaning of this standard. Evidence of the moisture-proof safety of building structures can be carried out using a three-stage assessment methodology depending on the application. The first stage is the selection of a proof-free design, the second stage is the simple verification using the period-balancing method and the 3rd stage the detection by hygrothermal simulation. The 1st and 2nd stages are exclusively applicable to permitted components of buildings which are not air-conditioned or residential-like.