Updated: 07.11.2026
A Overhead glazing is glazing inclined more than 10° from the vertical – i.e. glass roofs, roof windows, continuous rooflights and glazed skylights. Because the glass hangs above people, stricter rules apply than for vertical windows.
What does DIN 18008 require?
According to DIN 18008, the lower pane of overhead glazing must usually consist of Laminated safety glass (VSG) . If it breaks, the interlayers hold the fragments. The glass type required in each case is determined by the window manufacturer or structural engineer.
What does this mean for the window actuator?
- More weight: laminated glass and thicker panes increase the Sash weight.
- More force: on inclined sashes the actuator carries about half of the weight, plus the Snow load.
- More reserve: for roof surfaces we recommend +50 % Reserve.
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Tools: Calculate force and stroke with the Window actuator calculator, find the right model in a few questions with the actuator finder.
Not sure which actuator fits? Call us at 040 50694631 (Mon–Fri 8 am–5 pm) or use the actuator finder.
Related terms: Dome rooflight · Shape coefficient (snow load)
