A skylight is a light-transmitting structure that forms all or part of the roof space of a building for daylighting purposes.
Skylighting types include roof windows, unit skylights, tubular daylighting devices (TDDs), sloped glazing, and custom skylights. Uses include:
- daylighting elements used to allow direct and/or indirect sunlight, via toplighting.
- providing a visual connection to the outdoor environment to interior occupants.
- sustainable building — passive solar heating, and with operable units; ventilation for passive cooling and fresh air exchange.