NBN EN 12326-1:2004

TThis European Standard specifies requirements for slate and stone products for roofing and external cladding, as defined in 3.1, 3.2 and 3.3, used for assembly into discontinuous roofing and external cladding (except bonded cladding).
This European Standard does not apply to products for roofing or external cladding made from the following:
a) stone other than those defined in 3.1, 3.2 and 3.3;
b) concrete;
c) polymeric materials;
d) fibre reinforced cement;
e) metal;
f) clay.
This European Standard is not applicable to roofing and cladding slates used internally.
NOTE 1 Requirements for internal wall lining slate are specified in prEN 1469.
This European Standard is not applicable to bonded cladding (cladding fixed with adhesives).
For the purposes of this European Standard, slates for roofing and external cladding have been classified according to the product type and the stone from which they are made.
This European Standard does not include requirements for appearance.
NOTE 2 Some general guidance for appearance is given in annex A.