Every quarry grades their slates into “selection” during the production process. As there is no European or Industry benchmark, there is little or no consistency across the market defining what makes a particular grade. Every quarry will aim to produce the highest possible proportion of best quality slates, with the lower grade slates more keenly priced.
However, it is important to note that any potential savings made from using lower grade slates may be offset by increased time and labour charges involved in additional sorting and grading.
To ensure you have greater transparency when selecting natural slate, all SIGA slates are categorised into either ‘Excellence’, ‘Specification’, ‘Commercial’ or ‘Classic’:
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