1. The basic requirements for construction works set out in Annex I shall constitute the basis for the preparation of standardisation mandates and harmonised technical specifications.
2. The essential characteristics of construction products shall be laid down in harmonised technical specifications in relation to the basic requirements for construction works.
3. For specific families of construction products covered by a harmonised standard, the Commission shall, where appropriate and in relation to their intended uses as defined in harmonised standards, determine by means of delegated acts in accordance with Article 60, those essential characteristics for which the manufacturer shall declare the performance of the product when it is placed on the market. Where appropriate, the Commission shall also determine, by means of delegated acts in accordance with Article 60, the threshold levels for the performance in relation to the essential characteristics to be declared.