- The permitted static loads on the roof surface
- Climate, weather, wind and rainfall - including of the adjacent wall areas
- An open, back flow free connection into the public sewer system
- The emergency overflow and the type and use of the building
- Insulation, sound-proofing and fire protection
- Particulars regarding the surroundings, e.g.
- UV-radiation, dewpoint underrun, ambient temperature, etc.
- Regional building codes and local regulations.
![general](ageneral.gif)