Retractable roof structures that are primarily closed and are opened occasionally
or when there are special requirements (frequency closed – open)
(Figure 3). This type of retractable roof structure design is mainly used in
smaller buildings (sports halls) intended for indoor events, where the open
roof is used only occasionally (e.g. favourable weather conditions that do
not affect the implementation of activities).
This opening method is also used for the relief of the roof structure in the event of large quantities of
snow, which slide off the roof during its movement. If the building’s playing
area is made of natural grass, the open roof is used to provide optimal
conditions for grass growth.