External walls of a building and all their parts must be designed and constructed in such a manner that during the exploitation of the building they may permanently provide the following:
- Protection against atmospheric precipitation and effects – rain, snow, penetration of wind, dust and polluted air
- Fire prevention – at designing and construction of a facade, the provisions of the Technical Norms of Fire Prevention in High Buildings must be observed
- Thermal protection – to protect building users against insufficient or excessive heat, to provide comfortable living conditions, i.e. to provide good heat accumulation and to ensure the feeling of comfort is not disrupted due to a sudden change in heating regime or sudden change of outside temperature
- Diffusive vapour removal – to enable the passing through of water vapour without occurrence of condensate on either external surfaces or in the inside
- Heating energy savings – to reduce the need for energy intended for heating or cooling of rooms
- Acoustic protection – to protect building users against external noise.
