European Commission 16 March 2026, Commission Delegated Regulation (EU) 2026/557 of 16 March 2026 supplementing Regulation (EU) 2024/3110 of the European Parliament and of the Council by determining classes of performance in relation to the essential characteristic resistance to fire

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Commission Delegated Regulation (EU) 2026/557 supplements Regulation (EU) 2024/3110 by establishing harmonised classes of performance for construction products regarding the essential characteristic of resistance to fire. The regulation defines specific performance categories and symbols—such as load-bearing capacity (R), integrity (E), and insulation (I)—across various product groups including structural elements, ventilation systems, and electrical installations. It entered into force on the twentieth day following its publication in the Official Journal of the European Union and is directly applicable in all Member States.AI