CE Declarations of Performance

Under the European construction products directive, any organisation that produces, imports or sells natural must ensure that CE Marking and certification are sought and displayed.

BS EN 12326-1:2014 is the harmonised EU standard governing Natural Slate and stone for discontinuous roofing and cladding. All slates, irrespective of their origin, should be tested to the criteria laid down in the standard, and thus have a set of test results and carry the CE Mark.

Local Authority Building Control enforces these regulations, so you’ll need to check the slate carries the CE Mark, and your supplier provides a Declaration of Performance.

Purchasers and installers of natural roofing slate can check whether the slates they have purchased, or are using, have been tested to BS EN 12326 by looking for the CE Marking on any labels within the packaging and/or any documentation accompanying the slates, such as delivery notes or invoices.

Please note that CE Marking does not indicate the quality of a slate, but that it has been tested to BS EN 12326:2014, the bare minimum legal minimum.


  • All SIGA slates are tested to BS EN12326:2014, Declaration of Performance can be downloaded below
  • All SIGA slates carry the CE Mark
  • Every crate of SIGA slates is marked with EN test results
  • All SIGA slates are classified as T1 for minimal surface corrosion
  • All SIGA slates are classified as W1 (≤ 0,6%) for water absorption

CE marking Logo

Please Note: These declaration of performance are supplied in the Adobe Acrobat Reader (PDF) file format. Please click here to download and install Adobe Acrobat Reader.

Please select a declaration of performance from the links below. The declaration of performance will open in a new window. Alternatively, right click on the link and choose “Save as” from the pop up menu.