Modern construction increasingly uses very low-pitched roofs, which poses a real challenge when installing roof windows. The flat roof system eliminates limitations related to low roof pitches, enabling the installation of standard or smoke ventilation FAKRO windows even in pitches up to 15°. The specially designed construction allows the installation pitch to be increased by 15°, resulting in improved daylight penetration. This allows for effective illumination of residential, commercial and industrial interiors without the need for light tunnels or costly structural modifications.