On Sat, 14 Aug 2010 06:00:44 -0700 (PDT), Adam Aglionby wrote:

Is there a Euro/BS/BBA someat spec should ask for the slates to meet?

Just bought a handful of (spanish) slates and the crates in the
builders merchant had labels that detailed grades for weathering,
carbonate content, and a couple of other things. So there is a spec
or at least things they measure out there, google?

--
Cheers
Dave.