European standards EN 12326 for roofing slate
To guarantee a continuous quality standard of slates for roofing and cladding, this slates has to be tested according to the EN 12326: 'Slate and stone products for discontinuous roofing and cladding'.
This standard is separated in two parts. EN 12326-1 comprises
the product specification whereas EN 12326-2 defines the methods
In Germany, further requirements are defined in the 'Product Data Sheet' of the 'Central Association of the German Roofing Trade' ('Produktdatenblatt' of the Zentralverband des Deutschen Dachdeckerhandwerks).