What is a Declaration of Performance?
A clue to the purpose of a Declaration of Performance is its title. When a construction product falls within the scope of the Construction Products Regulations, and so needs to be CE marked, the manufacturer or importer is obliged to provide a guarantee that it meets the performance standard defined in the harmonised European Norm that the construction product has been made to. This is what the Declaration of Performance does.
What is needed for a Declaration of Performance?
Annex III of the EU Construction Products Regulation defines what needs to be included in a Declaration of Performance, but doesn’t give any guidance on how this should be presented. So the manufacturer can choose whatever format suits them best. For structural metalwork, made to a Factory Production Control system that conforms to EN 1090-1, a Declaration of Performance must include:-
- Name & number of the Notified Body
- FPC certificate number of the manufacturer
- Registered address of the manufacturer
- A description of the structural metalwork
- Unique identification of the design
- System of assessment and verification of constancy, which for EN 1090-1 is “2+”
- The harmonised technical specification, which is EN 1090-1:2009 + A1: 2011
- Performance against the essential characteristics in the current version of EN 1090-1
- The “basis of manufacture”
- A signature from the person taking responsibility for the safety of the product
What is the Basis of Manufacture?
The means to decide the Basis of Manufacture for a Declaration of Performance can be found in Annex A of EN 1090-1 and is a short-hand way of stating how the structural design has been carried out. Annex A allows for the customer to supply the design details against which the product is manufactured or for the manufacturer to provide them. What’s more, the Annex allows for structural calculations to be performed using Eurocodes, or for them to be calculated using other national standards that the customer may prefer and even for the manufacturer to make to a customer’s design without knowing whether structural calculations have been carried out at all. The Basis of Manufacture isn’t easy to interpret, but is compulsory information for a Declaration of Performance, so we’ve produce a decision tree flow-diagram that explains:-