Roof windows are chosen depending on the intended use and height of the room and the pitch of the roof.
- Intended use and height of the room
The correct amount of natural light in the room is calculated by the proportion of the surface of the window’s glass area to the total floor area. In a room for habitable purposes this proportion should be at least 1: 8, and in special rooms where more natural light is required the ratio should be at least 1:12
- The pitch of the roof
Height of the chosen window also depends on the roof pitch. The lower pitch of the roof, greater the height of the window should be.
The window placement
When deciding on the location of roof windows in the roof surface we should consider an important principle, which states that the better illumination effects are accomplished by installing several windows in various parts of the roof than by fitting one large window.