"In order to enable the producers and notified bodies to assess the mechanical strength of structural construction products, which is necessary for their conformity assessment, the technical specifications should refer to calculation methods developed in the Eurocodes."
Declaration of Performance and CE Marking
The Declaration of Performance (DoP) is the key concept in the Construction Products Regulation. It provides the necessary transparency and establishes a clear system of allocation of the responsibilities between actors. The DoP gives the manufacturer the opportunity to deliver the information about the essential characteristics of products covered by a harmonised standard or a European Technical Assessment.
The declaration of performance expresses the performance of construction products in relation to their essential characteristics in accordance with the relevant harmonised technical specifications. It contains, inter alia:
- the intended use or uses for the construction product;
- the list of essential characteristics, as determined in the harmonised technical specification;
- the performance of those essential characteristics of the construction product which are related to the intended use or uses;
- where applicable, the performance of the construction product, by levels or classes, or in a description, if necessary based on a calculation in relation to its essential characteristics.
In order to ensure that the declaration of performance is accurate and reliable, the performance of the construction product should be assessed and the production in the factory should be controlled in accordance with an appropriate system of assessment and verification of constancy of performance of the construction product.
The CE marking follows the DoP and means that the manufacturer has strictly followed all the applicable procedures for drawing up his DoP and, consequently, the DoP is accurate and reliable.
The European Commission promotes the use of the EN Eurocodes to declare the performance of construction products (e.g. pre-cast concrete products, structural timber products, structural steel components) aiming at:
- consistency with the values used for the design of the structure;
- common basis for the various component used in a construction work.
EN Eurocodes and the Declaration of Performance of Construction Products
The EN Eurocodes provide common design methods which are intended to be used as reference documents to determine the performance of construction products with regard to mechanical resistance and stability (Basic Requirement No 1 of the CPR), resistance to fire (Basic Requirement No 2) and safety and accessibility in use (Basic Requirement No 4), in the extent that it is part of the information accompanying the Declaration of Performance.
The performance level or class of a construction product may be determined on the basis of:
- type testing (including sampling);
- type calculation;
- tabulated values or descriptive documentation of the product.
The resulting values, levels, or classes are contained in the Declaration of Performance accompanying the CE marking of the product and used in the structural design of works or parts thereof.