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Which two installation methods does BS 5534 identify?
In the extraction process, natural slate uses how much less water than fibre cement?
In the north of England and Scotland the most common slate size is what?
When grading slate, what letter/number combination refers to a slate’s carbonate content?
According to UK regulations, if slate production from a site exceeds 12,000 tonnes a year, sample testing must be carried out how often?