Point: 5.3 Does the exemption rule for the use of toughened safety glass as overhead glazing in privately used rooms in accordance with ÖNORM B 3716 apply?

No, this is not possible. Although ÖNORM B 3716-2 can be used for the design, a higher level of safety is required in OIB Guideline 4, and consequently the exception provided for in the ÖNORM for the use of toughened safety glass in privately used rooms up to 4 m above the top edge of the floor and max. 8 mm glass thickness as single glazing or as the bottom pane of the insulating glass does not apply.